[{"department":[{"_id":"153"},{"_id":"241"},{"_id":"156"}],"user_id":"82875","_id":"62022","language":[{"iso":"eng"}],"publication":"Materials Research Proceedings","type":"conference","status":"public","abstract":[{"text":"<jats:p>Abstract. The incremental flow forming process features a large number of process parameter combinations that can be varied from pass to pass or during a pass. In the future however, a more efficient utilization of this large number of process parameter combinations and a compensation of process disturbances could be required. This is due to a rising demand for increasing the part complexity, e.g. by graded property structures or a more complex geometry. In this context, innovative approaches like closed-loop property control and optimal control are advantageous, but require fast process models of flow forming that are not state of the art. This paper thus proposes a new modelling approach of multi-pass flow forming especially taking the transfer behavior between process parameters and wall thickness evolution from pass to pass into focus. A hybrid modelling approach is developed that combines knowledge about the incremental process character with empirical data regression to a basic analytic relation. The basic relation is further extended by a multi-layer neural network to enhance the overall model accuracy. This hybrid modelling approach is finally validated using experimental data. Thus, it is shown that a suitable model structure was found in context of a future closed-loop control or optimal control for multi-pass flow forming.</jats:p>","lang":"eng"}],"volume":54,"date_created":"2025-10-30T12:16:37Z","author":[{"first_name":"Lukas","full_name":"Kersting, Lukas","last_name":"Kersting"},{"full_name":"Gunasagran, Sharin Kumar","last_name":"Gunasagran","first_name":"Sharin Kumar"},{"first_name":"Bahman","id":"36287","full_name":"Arian, Bahman","last_name":"Arian"},{"last_name":"Rozo Vaszquez","full_name":"Rozo Vaszquez, Julian","first_name":"Julian"},{"first_name":"Ansgar","last_name":"Trächtler","id":"552","full_name":"Trächtler, Ansgar"},{"last_name":"Homberg","full_name":"Homberg, Werner","id":"233","first_name":"Werner"},{"first_name":"Frank","full_name":"Walther, Frank","last_name":"Walther"}],"date_updated":"2025-10-30T12:53:36Z","oa":"1","publisher":"Materials Research Forum LLC","doi":"10.21741/9781644903599-140","main_file_link":[{"url":"https://doi.org/10.21741/9781644903599-140 ","open_access":"1"}],"title":"Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","intvolume":"        54","citation":{"bibtex":"@inproceedings{Kersting_Gunasagran_Arian_Rozo Vaszquez_Trächtler_Homberg_Walther_2025, title={Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model}, volume={54}, DOI={<a href=\"https://doi.org/10.21741/9781644903599-140\">10.21741/9781644903599-140</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Kersting, Lukas and Gunasagran, Sharin Kumar and Arian, Bahman and Rozo Vaszquez, Julian and Trächtler, Ansgar and Homberg, Werner and Walther, Frank}, year={2025} }","short":"L. Kersting, S.K. Gunasagran, B. Arian, J. Rozo Vaszquez, A. Trächtler, W. Homberg, F. Walther, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","mla":"Kersting, Lukas, et al. “Real-Time Modelling of Incremental Multi-Pass Flow Forming by a Hybrid, Data-Based Model.” <i>Materials Research Proceedings</i>, vol. 54, Materials Research Forum LLC, 2025, doi:<a href=\"https://doi.org/10.21741/9781644903599-140\">10.21741/9781644903599-140</a>.","apa":"Kersting, L., Gunasagran, S. K., Arian, B., Rozo Vaszquez, J., Trächtler, A., Homberg, W., &#38; Walther, F. (2025). Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model. <i>Materials Research Proceedings</i>, <i>54</i>. <a href=\"https://doi.org/10.21741/9781644903599-140\">https://doi.org/10.21741/9781644903599-140</a>","ama":"Kersting L, Gunasagran SK, Arian B, et al. Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model. In: <i>Materials Research Proceedings</i>. Vol 54. Materials Research Forum LLC; 2025. doi:<a href=\"https://doi.org/10.21741/9781644903599-140\">10.21741/9781644903599-140</a>","chicago":"Kersting, Lukas, Sharin Kumar Gunasagran, Bahman Arian, Julian Rozo Vaszquez, Ansgar Trächtler, Werner Homberg, and Frank Walther. “Real-Time Modelling of Incremental Multi-Pass Flow Forming by a Hybrid, Data-Based Model.” In <i>Materials Research Proceedings</i>, Vol. 54. Materials Research Forum LLC, 2025. <a href=\"https://doi.org/10.21741/9781644903599-140\">https://doi.org/10.21741/9781644903599-140</a>.","ieee":"L. Kersting <i>et al.</i>, “Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model,” in <i>Materials Research Proceedings</i>, 2025, vol. 54, doi: <a href=\"https://doi.org/10.21741/9781644903599-140\">10.21741/9781644903599-140</a>."},"year":"2025"},{"language":[{"iso":"eng"}],"ddc":["600"],"publication":"Materials Research Proceedings","license":"https://creativecommons.org/licenses/by-nc/3.0/","file":[{"relation":"main_file","success":1,"content_type":"application/pdf","file_id":"59092","file_name":"Shemat.pdf","access_level":"closed","file_size":1901767,"date_created":"2025-03-25T08:02:30Z","creator":"kekeyang","date_updated":"2025-03-25T08:02:30Z"}],"abstract":[{"lang":"eng","text":"<jats:p>Abstract. Liquid Metal Embrittlement (LME) cracking is a well-documented issue encountered during resistance spot welding (RSW) of zinc-coated advanced high-strength steels (AHSS) in automotive manufacturing. Given that existing research has predominantly focused on laboratory-scale samples and lacks investigation into the load-bearing capacity of joints under crash conditions, this study aims to fill these gaps by analyzing third-generation zinc-coated AHSS. S-Rail components were produced through stamping to replicate real-world manufacturing conditions and geometries of automotive parts. To account for the disturbances typically encountered in production, samples with LME cracks were intentionally fabricated. Subsequently, a modified three-point bending test, assisted by numerical simulations, was developed to effectively apply loads to the weld spots of the S-Rail components. Results from crash tests demonstrated that observed light crack severity does not significantly compromise the joint's load-bearing capacity or lead to earlier joint failure.</jats:p>"}],"date_created":"2025-03-25T07:59:49Z","publisher":"Materials Research Forum LLC","title":"Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components","quality_controlled":"1","year":"2025","department":[{"_id":"157"}],"user_id":"65085","_id":"59091","file_date_updated":"2025-03-25T08:02:30Z","type":"conference","status":"public","volume":52,"author":[{"first_name":"Keke","id":"65085","full_name":"Yang, Keke","orcid":"0000-0001-9201-9304","last_name":"Yang"},{"last_name":"Biegler","full_name":"Biegler, Max","first_name":"Max"},{"full_name":"Happe, Linus","last_name":"Happe","first_name":"Linus"},{"first_name":"Marius","last_name":"Striewe","id":"30228","full_name":"Striewe, Marius"},{"last_name":"Olfert","full_name":"Olfert, Viktoria","id":"5974","first_name":"Viktoria"},{"full_name":"Hein, David","id":"7728","last_name":"Hein","first_name":"David"},{"first_name":"Michael ","full_name":"Rethmeier, Michael ","last_name":"Rethmeier"},{"first_name":"Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","full_name":"Meschut, Gerson","id":"32056"}],"oa":"1","date_updated":"2025-12-26T13:44:36Z","doi":"10.21741/9781644903551-42","main_file_link":[{"open_access":"1"}],"publication_identifier":{"issn":["2474-395X"]},"has_accepted_license":"1","publication_status":"published","intvolume":"        52","citation":{"bibtex":"@inproceedings{Yang_Biegler_Happe_Striewe_Olfert_Hein_Rethmeier_Meschut_2025, title={Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components}, volume={52}, DOI={<a href=\"https://doi.org/10.21741/9781644903551-42\">10.21741/9781644903551-42</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Yang, Keke and Biegler, Max and Happe, Linus and Striewe, Marius and Olfert, Viktoria and Hein, David and Rethmeier, Michael  and Meschut, Gerson}, year={2025} }","mla":"Yang, Keke, et al. “Influence of Liquid Metal Embrittlement on Load-Bearing Capacity of Resistance Spot Welds under Crash Loads: A Study Based on S-Rail Components.” <i>Materials Research Proceedings</i>, vol. 52, Materials Research Forum LLC, 2025, doi:<a href=\"https://doi.org/10.21741/9781644903551-42\">10.21741/9781644903551-42</a>.","short":"K. Yang, M. Biegler, L. Happe, M. Striewe, V. Olfert, D. Hein, M. Rethmeier, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","apa":"Yang, K., Biegler, M., Happe, L., Striewe, M., Olfert, V., Hein, D., Rethmeier, M., &#38; Meschut, G. (2025). Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components. <i>Materials Research Proceedings</i>, <i>52</i>. <a href=\"https://doi.org/10.21741/9781644903551-42\">https://doi.org/10.21741/9781644903551-42</a>","ama":"Yang K, Biegler M, Happe L, et al. Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components. In: <i>Materials Research Proceedings</i>. Vol 52. Materials Research Forum LLC; 2025. doi:<a href=\"https://doi.org/10.21741/9781644903551-42\">10.21741/9781644903551-42</a>","chicago":"Yang, Keke, Max Biegler, Linus Happe, Marius Striewe, Viktoria Olfert, David Hein, Michael  Rethmeier, and Gerson Meschut. “Influence of Liquid Metal Embrittlement on Load-Bearing Capacity of Resistance Spot Welds under Crash Loads: A Study Based on S-Rail Components.” In <i>Materials Research Proceedings</i>, Vol. 52. Materials Research Forum LLC, 2025. <a href=\"https://doi.org/10.21741/9781644903551-42\">https://doi.org/10.21741/9781644903551-42</a>.","ieee":"K. Yang <i>et al.</i>, “Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components,” in <i>Materials Research Proceedings</i>, 2025, vol. 52, doi: <a href=\"https://doi.org/10.21741/9781644903551-42\">10.21741/9781644903551-42</a>."}},{"year":"2025","quality_controlled":"1","title":"Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry","publisher":"Materials Research Forum LLC","date_created":"2025-07-14T13:25:26Z","abstract":[{"lang":"eng","text":"<jats:p>Abstract. In the field of online condition monitoring, non-destructive testing methods using active acoustic testing [1] emerged as innovative tools. These techniques are particularly effective because damage in joined structures leads to significant changes in their vibrational characteristics. However, the consistent use of online condition monitoring through active acoustic testing combined with complex pattern recognition for early crack detection in joined components has not yet been fully established. This research aims to develop an online crack detection system employing pattern recognition techniques under cyclic loading during fatigue tests, utilizing non-contact active acoustic testing with laser vibrometry. Due to the wide range of materials that can be joined, mechanical joining processes can be used in many different industry branches. Self-pierce riveting (SPR), in particular, is a well-established joining process. Therefore, the investigations for online crack detection initially focus on SPR joints. To achieve this, the fatigue behavior of SPR joints in a lap-shear configuration was characterized. Experimental fatigue testing demonstrated that SPR joint failure occurs either through cracks propagating in the sheet material away from the rivet or in the rivet foot, depending on the material combination. Laser vibrometry has been successfully used as a crack detection system and has proven to be effective in detecting crack initiation in SPR joints. Cracks can be detected without contact regardless of the material combination, the damage location, the size of the damage, or the type of damage.  The optimization of the crack detection system involved several key enhancements, including adjusting data acquisition to improve crack detection, incorporating principal component analysis (PCA) to reduce dimensionality, and implementing a classification model based on a global training dataset. An intuitive, problem-specific software demonstrator for analyzing the crack initiation behavior of SPR joints under cyclic loading was developed and iteratively optimized. Future work will focus on the implementation of an autoencoder network to further enhance crack detection capabilities.</jats:p>"}],"publication":"Materials Research Proceedings","language":[{"iso":"eng"}],"intvolume":"        54","citation":{"ama":"Olfert V, Yang K, Gollnick M, Krause J, Hein D, Meschut G. Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry. In: <i>Materials Research Proceedings</i>. Vol 54. Materials Research Forum LLC; 2025. doi:<a href=\"https://doi.org/10.21741/9781644903599-154\">10.21741/9781644903599-154</a>","chicago":"Olfert, Viktoria, Keke Yang, Maik Gollnick, Jacob Krause, David Hein, and Gerson Meschut. “Analysis of Fatigue Behaviour of Self-Piercing Riveted Joints under Cyclic Loading Using Laser Vibrometry.” In <i>Materials Research Proceedings</i>, Vol. 54. Materials Research Forum LLC, 2025. <a href=\"https://doi.org/10.21741/9781644903599-154\">https://doi.org/10.21741/9781644903599-154</a>.","ieee":"V. Olfert, K. Yang, M. Gollnick, J. Krause, D. Hein, and G. Meschut, “Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry,” in <i>Materials Research Proceedings</i>, 2025, vol. 54, doi: <a href=\"https://doi.org/10.21741/9781644903599-154\">10.21741/9781644903599-154</a>.","short":"V. Olfert, K. Yang, M. Gollnick, J. Krause, D. Hein, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","mla":"Olfert, Viktoria, et al. “Analysis of Fatigue Behaviour of Self-Piercing Riveted Joints under Cyclic Loading Using Laser Vibrometry.” <i>Materials Research Proceedings</i>, vol. 54, Materials Research Forum LLC, 2025, doi:<a href=\"https://doi.org/10.21741/9781644903599-154\">10.21741/9781644903599-154</a>.","bibtex":"@inproceedings{Olfert_Yang_Gollnick_Krause_Hein_Meschut_2025, title={Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry}, volume={54}, DOI={<a href=\"https://doi.org/10.21741/9781644903599-154\">10.21741/9781644903599-154</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Olfert, Viktoria and Yang, Keke and Gollnick, Maik and Krause, Jacob and Hein, David and Meschut, Gerson}, year={2025} }","apa":"Olfert, V., Yang, K., Gollnick, M., Krause, J., Hein, D., &#38; Meschut, G. (2025). Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry. <i>Materials Research Proceedings</i>, <i>54</i>. <a href=\"https://doi.org/10.21741/9781644903599-154\">https://doi.org/10.21741/9781644903599-154</a>"},"publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","doi":"10.21741/9781644903599-154","main_file_link":[{"open_access":"1"}],"oa":"1","date_updated":"2025-12-26T13:45:01Z","volume":54,"author":[{"first_name":"Viktoria","last_name":"Olfert","full_name":"Olfert, Viktoria","id":"5974"},{"last_name":"Yang","orcid":"0000-0001-9201-9304","full_name":"Yang, Keke","id":"65085","first_name":"Keke"},{"full_name":"Gollnick, Maik","last_name":"Gollnick","first_name":"Maik"},{"last_name":"Krause","full_name":"Krause, Jacob","first_name":"Jacob"},{"last_name":"Hein","full_name":"Hein, David","id":"7728","first_name":"David"},{"first_name":"Gerson","last_name":"Meschut","orcid":"0000-0002-2763-1246","id":"32056","full_name":"Meschut, Gerson"}],"status":"public","type":"conference","_id":"60604","department":[{"_id":"157"}],"user_id":"65085"},{"doi":"10.21741/9781644903551-28","title":"Consideration of residual stresses and damage in the fracture mechanical investigation of mechanically joined structures","volume":52,"author":[{"full_name":"Weiß, Deborah","id":"45673","last_name":"Weiß","first_name":"Deborah"},{"last_name":"Duffe","id":"41322","full_name":"Duffe, Tobias","first_name":"Tobias"},{"id":"30821","full_name":"Joy, Tintu David","last_name":"Joy","first_name":"Tintu David"},{"first_name":"Gunter","id":"291","full_name":"Kullmer, Gunter","last_name":"Kullmer"}],"date_created":"2026-03-27T13:51:43Z","date_updated":"2026-03-27T13:55:18Z","publisher":"Materials Research Forum LLC","intvolume":"        52","citation":{"bibtex":"@inproceedings{Weiß_Duffe_Joy_Kullmer_2025, title={Consideration of residual stresses and damage in the fracture mechanical investigation of mechanically joined structures}, volume={52}, DOI={<a href=\"https://doi.org/10.21741/9781644903551-28\">10.21741/9781644903551-28</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Weiß, Deborah and Duffe, Tobias and Joy, Tintu David and Kullmer, Gunter}, year={2025} }","mla":"Weiß, Deborah, et al. “Consideration of Residual Stresses and Damage in the Fracture Mechanical Investigation of Mechanically Joined Structures.” <i>Materials Research Proceedings</i>, vol. 52, Materials Research Forum LLC, 2025, doi:<a href=\"https://doi.org/10.21741/9781644903551-28\">10.21741/9781644903551-28</a>.","short":"D. Weiß, T. Duffe, T.D. Joy, G. Kullmer, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","apa":"Weiß, D., Duffe, T., Joy, T. D., &#38; Kullmer, G. (2025). Consideration of residual stresses and damage in the fracture mechanical investigation of mechanically joined structures. <i>Materials Research Proceedings</i>, <i>52</i>. <a href=\"https://doi.org/10.21741/9781644903551-28\">https://doi.org/10.21741/9781644903551-28</a>","ieee":"D. Weiß, T. Duffe, T. D. Joy, and G. Kullmer, “Consideration of residual stresses and damage in the fracture mechanical investigation of mechanically joined structures,” in <i>Materials Research Proceedings</i>, 2025, vol. 52, doi: <a href=\"https://doi.org/10.21741/9781644903551-28\">10.21741/9781644903551-28</a>.","chicago":"Weiß, Deborah, Tobias Duffe, Tintu David Joy, and Gunter Kullmer. “Consideration of Residual Stresses and Damage in the Fracture Mechanical Investigation of Mechanically Joined Structures.” In <i>Materials Research Proceedings</i>, Vol. 52. Materials Research Forum LLC, 2025. <a href=\"https://doi.org/10.21741/9781644903551-28\">https://doi.org/10.21741/9781644903551-28</a>.","ama":"Weiß D, Duffe T, Joy TD, Kullmer G. Consideration of residual stresses and damage in the fracture mechanical investigation of mechanically joined structures. In: <i>Materials Research Proceedings</i>. Vol 52. Materials Research Forum LLC; 2025. doi:<a href=\"https://doi.org/10.21741/9781644903551-28\">10.21741/9781644903551-28</a>"},"year":"2025","quality_controlled":"1","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","language":[{"iso":"eng"}],"department":[{"_id":"9"},{"_id":"143"}],"user_id":"85414","_id":"65172","status":"public","abstract":[{"lang":"eng","text":"<jats:p>Abstract. The process of joining is used in numerous sectors of the manufacturing industry, where constructions composed of individual components or metal sheets are combined to form complex structures. A straightforward and pervasive approach for joining materials of disparate natures and coated surfaces is clinching. During the clinching process, plastic deformation, residual stresses and damage are introduced into the joint. Due to time-varying service loads cracks can initiate and propagate in the vicinity of the joint which limits the lifetime of the clinched structure. In order to prevent those damage cases, it is crucial to perform fracture mechanical evaluation of cracks in the joint region. Therefore, this publication deals with the question of how plastic deformation, residual stresses and damage need to be considered for the assessment of a crack. For this purpose, simple substitute models are employed to illustrate the principles based on the clinching application example.</jats:p>"}],"publication":"Materials Research Proceedings","type":"conference"},{"publication":"Materials Research Proceedings","abstract":[{"lang":"eng","text":"<jats:p>Abstract. This study presents intrinsic lubrication as a novel approach to deep drawing processes, using additively manufactured, lubricant-permeable tools to minimize lubricant consumption and improve efficiency. Two systems were evaluated: a passive system based on capillary action and gravity, and an active system using pumped delivery for precise, on-demand application. Experimental tests were conducted on micro-bores (0.2-0.5 mm) to demonstrate their suitability for lubricant transport. Smaller bores have excellent capillary action but are prone to clogging, while larger bores offer higher permeability. The passive system is resource-efficient but requires adjustments to counteract gravitational asymmetry. The active system provides consistent lubricant distribution but is more complex. These findings provide a basis for optimizing intrinsic lubrication systems.</jats:p>"}],"language":[{"iso":"eng"}],"quality_controlled":"1","year":"2025","publisher":"Materials Research Forum LLC","date_created":"2025-05-14T08:53:41Z","title":"Intrinsic lubrication: A new approach in the context of the deep drawing process","type":"conference","status":"public","_id":"59894","department":[{"_id":"156"},{"_id":"321"}],"user_id":"79551","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","intvolume":"        54","citation":{"mla":"Cakici, Ermir, and Werner Homberg. “Intrinsic Lubrication: A New Approach in the Context of the Deep Drawing Process.” <i>Materials Research Proceedings</i>, vol. 54, Materials Research Forum LLC, 2025, doi:<a href=\"https://doi.org/10.21741/9781644903599-122\">10.21741/9781644903599-122</a>.","bibtex":"@inproceedings{Cakici_Homberg_2025, title={Intrinsic lubrication: A new approach in the context of the deep drawing process}, volume={54}, DOI={<a href=\"https://doi.org/10.21741/9781644903599-122\">10.21741/9781644903599-122</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Cakici, Ermir and Homberg, Werner}, year={2025} }","short":"E. Cakici, W. Homberg, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","apa":"Cakici, E., &#38; Homberg, W. (2025). Intrinsic lubrication: A new approach in the context of the deep drawing process. <i>Materials Research Proceedings</i>, <i>54</i>. <a href=\"https://doi.org/10.21741/9781644903599-122\">https://doi.org/10.21741/9781644903599-122</a>","ieee":"E. Cakici and W. Homberg, “Intrinsic lubrication: A new approach in the context of the deep drawing process,” in <i>Materials Research Proceedings</i>, Paestum, Italien, 2025, vol. 54, doi: <a href=\"https://doi.org/10.21741/9781644903599-122\">10.21741/9781644903599-122</a>.","chicago":"Cakici, Ermir, and Werner Homberg. “Intrinsic Lubrication: A New Approach in the Context of the Deep Drawing Process.” In <i>Materials Research Proceedings</i>, Vol. 54. Materials Research Forum LLC, 2025. <a href=\"https://doi.org/10.21741/9781644903599-122\">https://doi.org/10.21741/9781644903599-122</a>.","ama":"Cakici E, Homberg W. Intrinsic lubrication: A new approach in the context of the deep drawing process. In: <i>Materials Research Proceedings</i>. Vol 54. Materials Research Forum LLC; 2025. doi:<a href=\"https://doi.org/10.21741/9781644903599-122\">10.21741/9781644903599-122</a>"},"date_updated":"2026-04-16T08:33:32Z","volume":54,"author":[{"first_name":"Ermir","last_name":"Cakici","id":"79551","full_name":"Cakici, Ermir"},{"full_name":"Homberg, Werner","id":"233","last_name":"Homberg","first_name":"Werner"}],"doi":"10.21741/9781644903599-122","conference":{"name":"The 28th International ESAFORM Conference on Material Forming - ESAFORM 2025","start_date":"2025-05-07","end_date":"2025-05-09","location":"Paestum, Italien"},"main_file_link":[{"url":"https://mrforum.com/product/9781644903599-122/"}]},{"title":"Modular 3D roller straightening – A new approach to straightening and forming of spring steel wires (X10CrNi18-8)","doi":"10.21741/9781644903131-154","conference":{"location":"Toulouse","name":"ESAFORM2024"},"date_updated":"2024-05-27T08:16:18Z","publisher":"Materials Research Forum LLC","date_created":"2024-04-25T08:29:20Z","author":[{"id":"64977","full_name":"Dahms, Frederik Simon","last_name":"Dahms","first_name":"Frederik Simon"},{"first_name":"Werner","full_name":"Homberg, Werner","id":"233","last_name":"Homberg"}],"year":"2024","citation":{"chicago":"Dahms, Frederik Simon, and Werner Homberg. “Modular 3D Roller Straightening – A New Approach to Straightening and Forming of Spring Steel Wires (X10CrNi18-8).” In <i>Materials Research Proceedings</i>. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-154\">https://doi.org/10.21741/9781644903131-154</a>.","ieee":"F. S. Dahms and W. Homberg, “Modular 3D roller straightening – A new approach to straightening and forming of spring steel wires (X10CrNi18-8),” presented at the ESAFORM2024, Toulouse, 2024, doi: <a href=\"https://doi.org/10.21741/9781644903131-154\">10.21741/9781644903131-154</a>.","ama":"Dahms FS, Homberg W. Modular 3D roller straightening – A new approach to straightening and forming of spring steel wires (X10CrNi18-8). In: <i>Materials Research Proceedings</i>. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-154\">10.21741/9781644903131-154</a>","short":"F.S. Dahms, W. Homberg, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","bibtex":"@inproceedings{Dahms_Homberg_2024, title={Modular 3D roller straightening – A new approach to straightening and forming of spring steel wires (X10CrNi18-8)}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-154\">10.21741/9781644903131-154</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Dahms, Frederik Simon and Homberg, Werner}, year={2024} }","mla":"Dahms, Frederik Simon, and Werner Homberg. “Modular 3D Roller Straightening – A New Approach to Straightening and Forming of Spring Steel Wires (X10CrNi18-8).” <i>Materials Research Proceedings</i>, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-154\">10.21741/9781644903131-154</a>.","apa":"Dahms, F. S., &#38; Homberg, W. (2024). Modular 3D roller straightening – A new approach to straightening and forming of spring steel wires (X10CrNi18-8). <i>Materials Research Proceedings</i>. ESAFORM2024, Toulouse. <a href=\"https://doi.org/10.21741/9781644903131-154\">https://doi.org/10.21741/9781644903131-154</a>"},"publication_status":"published","quality_controlled":"1","publication_identifier":{"issn":["2474-395X"]},"language":[{"iso":"eng"}],"_id":"53638","user_id":"64977","department":[{"_id":"156"}],"abstract":[{"lang":"eng","text":"<jats:p>Abstract. Spring steel wires are usually supplied and stored on coils. The manufacturing and coiling processes of these wires induce inhomogeneous plastic deformations that lead to undesirable residual stresses and varying wire curvatures in the semi-finished product. These residual stresses and curvatures defects are causing varying process conditions in the subsequent manufacturing processes, which have a negative impact on the product quality, leading to wastage and thus affecting the economic and ecological efficiency. Especially the curvature deviations must be compensated for the stability of the subsequent processes. This is usually realised with roller straighteners, which are set manually by the machine operators only at the beginning of a process. In this paper, we introduce a new approach with a modular straightening-machine design and a new set-up process. The more isolated deformation behaviour in a module-based straightener overcomes the complexity of interactions between the close-positioned spaced straightening rollers. This is combined with a set-up process that is independent of conventional material testing, modelling the actual and batch-specific behaviour of the wire in the straightening process. The exact knowledge and time-consuming determination of the material properties thus becomes obsolete. The experimental investigations show the influence of defined straightening strategies on the residual stress evolution and the residual forming limit of the spring steel wires (X10CrNi18-8) in the new straightening process. </jats:p>"}],"status":"public","type":"conference","publication":"Materials Research Proceedings"},{"intvolume":"        41","citation":{"apa":"Kraus, C., Böhnke, M., Drossel, W.-G., &#38; Meschut, G. (2024). Development of new strategies for the mechanical joining of components made of aluminum die casting. <i>Materials Research Proceedings</i>, <i>41</i>. <a href=\"https://doi.org/10.21741/9781644903131-190\">https://doi.org/10.21741/9781644903131-190</a>","short":"C. Kraus, M. Böhnke, W.-G. Drossel, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","bibtex":"@inproceedings{Kraus_Böhnke_Drossel_Meschut_2024, title={Development of new strategies for the mechanical joining of components made of aluminum die casting}, volume={41}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-190\">10.21741/9781644903131-190</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Kraus, Christian and Böhnke, Max and Drossel, Welf-Guntram and Meschut, Gerson}, year={2024} }","mla":"Kraus, Christian, et al. “Development of New Strategies for the Mechanical Joining of Components Made of Aluminum Die Casting.” <i>Materials Research Proceedings</i>, vol. 41, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-190\">10.21741/9781644903131-190</a>.","ama":"Kraus C, Böhnke M, Drossel W-G, Meschut G. Development of new strategies for the mechanical joining of components made of aluminum die casting. In: <i>Materials Research Proceedings</i>. Vol 41. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-190\">10.21741/9781644903131-190</a>","ieee":"C. Kraus, M. Böhnke, W.-G. Drossel, and G. Meschut, “Development of new strategies for the mechanical joining of components made of aluminum die casting,” in <i>Materials Research Proceedings</i>, Toulouse, 2024, vol. 41, doi: <a href=\"https://doi.org/10.21741/9781644903131-190\">10.21741/9781644903131-190</a>.","chicago":"Kraus, Christian, Max Böhnke, Welf-Guntram Drossel, and Gerson Meschut. “Development of New Strategies for the Mechanical Joining of Components Made of Aluminum Die Casting.” In <i>Materials Research Proceedings</i>, Vol. 41. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-190\">https://doi.org/10.21741/9781644903131-190</a>."},"year":"2024","publication_identifier":{"issn":["2474-395X"]},"quality_controlled":"1","publication_status":"published","conference":{"location":"Toulouse","name":"ESAFORM2024"},"doi":"10.21741/9781644903131-190","title":"Development of new strategies for the mechanical joining of components made of aluminum die casting","volume":41,"date_created":"2025-01-28T08:57:46Z","author":[{"last_name":"Kraus","full_name":"Kraus, Christian","first_name":"Christian"},{"first_name":"Max","id":"45779","full_name":"Böhnke, Max","last_name":"Böhnke"},{"full_name":"Drossel, Welf-Guntram","last_name":"Drossel","first_name":"Welf-Guntram"},{"first_name":"Gerson","full_name":"Meschut, Gerson","id":"32056","orcid":"0000-0002-2763-1246","last_name":"Meschut"}],"publisher":"Materials Research Forum LLC","date_updated":"2025-01-28T09:04:30Z","status":"public","abstract":[{"text":"<jats:p>Abstract. Structures made of aluminum die casting are being used in increasing quantities as well as component sizes for various applications. Due to the size of the components, heat treatment of the cast parts following the casting process is omitted in order to meet dimensional accuracy requirements and reduce production costs. From such an approach, challenges arise with regard to the mechanical joining of these aluminum die-cast structures. On one hand, the absence of heat treatment results in a general decrease in ductility. On the other hand, the increasing size of the components introduces process-related tolerances regarding the quality of the casting, including the presence of air or gas inclusions, and significant variations in ductility within the component. These factors present challenges for mechanical joining technologies, such as the potential risk of crack-related defects during the joining process. For the robust mechanical joining of such materials, the development and validation of suitable joining strategies for aluminum die cast components is presented in this paper. A preparatory step involving localized heat treatment in the joining area is implemented to enhance the suitability of the casting material for mechanical joining. The objective is to generate an improved ductility state in the aluminum die casting material, enabling crack-free joining through self-pierce riveting. Additionally, the formability of the aluminum die casting material is characterized using a specially developed ductility testing method. This allows the prediction of potential crack-related defects during mechanical joining. The methods described are developed using the AlSi10MnMg material in its as-cast state and applied to the self-pierce riveting process. </jats:p>","lang":"eng"}],"publication":"Materials Research Proceedings","type":"conference","language":[{"iso":"eng"}],"user_id":"45779","_id":"58384"},{"doi":"10.21741/9781644903131-187","title":"In-situ CT of the clinching process – Influence of settling effects due to process interruptions","volume":41,"author":[{"full_name":"Köhler, D.","last_name":"Köhler","first_name":"D."},{"first_name":"R.","last_name":"Kupfer","full_name":"Kupfer, R."},{"last_name":"Troschitz","full_name":"Troschitz, J.","first_name":"J."},{"first_name":"M.","last_name":"Gude","full_name":"Gude, M."}],"date_created":"2025-06-02T20:04:17Z","publisher":"Materials Research Forum LLC","date_updated":"2025-06-02T20:18:11Z","intvolume":"        41","citation":{"chicago":"Köhler, D., R. Kupfer, J. Troschitz, and M. Gude. “In-Situ CT of the Clinching Process – Influence of Settling Effects Due to Process Interruptions.” In <i>Materials Research Proceedings</i>, Vol. 41. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-187\">https://doi.org/10.21741/9781644903131-187</a>.","ieee":"D. Köhler, R. Kupfer, J. Troschitz, and M. Gude, “In-situ CT of the clinching process – Influence of settling effects due to process interruptions,” in <i>Materials Research Proceedings</i>, 2024, vol. 41, doi: <a href=\"https://doi.org/10.21741/9781644903131-187\">10.21741/9781644903131-187</a>.","ama":"Köhler D, Kupfer R, Troschitz J, Gude M. In-situ CT of the clinching process – Influence of settling effects due to process interruptions. In: <i>Materials Research Proceedings</i>. Vol 41. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-187\">10.21741/9781644903131-187</a>","apa":"Köhler, D., Kupfer, R., Troschitz, J., &#38; Gude, M. (2024). In-situ CT of the clinching process – Influence of settling effects due to process interruptions. <i>Materials Research Proceedings</i>, <i>41</i>. <a href=\"https://doi.org/10.21741/9781644903131-187\">https://doi.org/10.21741/9781644903131-187</a>","bibtex":"@inproceedings{Köhler_Kupfer_Troschitz_Gude_2024, title={In-situ CT of the clinching process – Influence of settling effects due to process interruptions}, volume={41}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-187\">10.21741/9781644903131-187</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Köhler, D. and Kupfer, R. and Troschitz, J. and Gude, M.}, year={2024} }","short":"D. Köhler, R. Kupfer, J. Troschitz, M. Gude, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","mla":"Köhler, D., et al. “In-Situ CT of the Clinching Process – Influence of Settling Effects Due to Process Interruptions.” <i>Materials Research Proceedings</i>, vol. 41, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-187\">10.21741/9781644903131-187</a>."},"year":"2024","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","language":[{"iso":"eng"}],"department":[{"_id":"157"},{"_id":"43"}],"user_id":"83408","_id":"60107","project":[{"grant_number":"418701707","name":"TRR 285: TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"_id":"133","name":"TRR 285 - C: TRR 285 - Project Area C"},{"name":"TRR 285 – C04: TRR 285 - Subproject C04","_id":"148"}],"status":"public","abstract":[{"text":"<jats:p>Abstract. In lightweight constructions, clinching represents a cost-effective solution, in which joints are produced by local cold forming of the joining parts. Clinching phenomena are typically evaluated using destructive testing methods. While these methods influence the clinch point’s state, in-situ computed tomography (in-situ CT) is able to explore the clinching process with a specimen under load. Here, the path-controlled clinching process is interrupted at certain displacement levels and the specimen is scanned by CT while remaining in a stationary state. These interruptions are always accompanied by settling effects reducing the reaction force. Therefore, in this work, the influence of these interruptions on the force-displacement behavior during clinching and on the final clinch point’s geometric properties is investigated. </jats:p>","lang":"eng"}],"publication":"Materials Research Proceedings","type":"conference"},{"main_file_link":[{"open_access":"1"}],"doi":"10.21741/9781644903131-183","title":"Non-rotationally symmetric joints – Mechanisms and load bearing capacity","author":[{"id":"76837","full_name":"Devulapally, Deekshith Reddy","last_name":"Devulapally","first_name":"Deekshith Reddy"},{"full_name":"Martin, Sven","id":"38177","last_name":"Martin","first_name":"Sven"},{"first_name":"Thomas","full_name":"Tröster, Thomas","id":"553","last_name":"Tröster"}],"date_created":"2024-08-19T08:29:22Z","publisher":"Materials Research Forum LLC","date_updated":"2026-02-27T10:50:30Z","oa":"1","citation":{"mla":"Devulapally, Deekshith Reddy, et al. “Non-Rotationally Symmetric Joints – Mechanisms and Load Bearing Capacity.” <i>Materials Research Proceedings</i>, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-183\">10.21741/9781644903131-183</a>.","short":"D.R. Devulapally, S. Martin, T. Tröster, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","bibtex":"@inproceedings{Devulapally_Martin_Tröster_2024, title={Non-rotationally symmetric joints – Mechanisms and load bearing capacity}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-183\">10.21741/9781644903131-183</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Devulapally, Deekshith Reddy and Martin, Sven and Tröster, Thomas}, year={2024} }","apa":"Devulapally, D. R., Martin, S., &#38; Tröster, T. (2024). Non-rotationally symmetric joints – Mechanisms and load bearing capacity. <i>Materials Research Proceedings</i>. <a href=\"https://doi.org/10.21741/9781644903131-183\">https://doi.org/10.21741/9781644903131-183</a>","ama":"Devulapally DR, Martin S, Tröster T. Non-rotationally symmetric joints – Mechanisms and load bearing capacity. In: <i>Materials Research Proceedings</i>. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-183\">10.21741/9781644903131-183</a>","ieee":"D. R. Devulapally, S. Martin, and T. Tröster, “Non-rotationally symmetric joints – Mechanisms and load bearing capacity,” 2024, doi: <a href=\"https://doi.org/10.21741/9781644903131-183\">10.21741/9781644903131-183</a>.","chicago":"Devulapally, Deekshith Reddy, Sven Martin, and Thomas Tröster. “Non-Rotationally Symmetric Joints – Mechanisms and Load Bearing Capacity.” In <i>Materials Research Proceedings</i>. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-183\">https://doi.org/10.21741/9781644903131-183</a>."},"year":"2024","publication_status":"published","publication_identifier":{"issn":["2474-395X"]},"language":[{"iso":"eng"}],"user_id":"76837","department":[{"_id":"149"},{"_id":"321"},{"_id":"9"}],"project":[{"name":"TRR 285 – B01: TRR 285 - Subproject B01","_id":"140"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"_id":"130","name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"_id":"55638","status":"public","abstract":[{"lang":"eng","text":"<jats:p>Abstract. Traditionally, joints are cylindrical and rotationally symmetric. In the present study, non-rotationally symmetric joints are used for joining steel and Glass mat-reinforced thermoplastic sheets (GMT). In addition, the study also analyzes the impact of non-rotational symmetric joint rotation on the load-bearing capacity. Single lap joint specimens were fabricated using the In-Mold assembly technique for joining steel sheets with GMT. Tensile shear tests were performed on different orientations of the joint geometry, and it was observed that changing the joint orientation influences the load-bearing capacity. The joints are constitutively modeled using beam elements and the influence of joint rotation on load distribution is examined through a static simulation study. </jats:p>"}],"type":"conference","publication":"Materials Research Proceedings"},{"date_updated":"2024-11-18T10:42:55Z","publisher":"Materials Research Forum LLC","volume":44,"date_created":"2024-11-18T10:06:17Z","author":[{"last_name":"Arian","id":"36287","full_name":"Arian, Bahman","first_name":"Bahman"},{"last_name":"Homberg","id":"233","full_name":"Homberg, Werner","first_name":"Werner"},{"last_name":"Kersting","full_name":"Kersting, Lukas","first_name":"Lukas"},{"last_name":"Trächtler","full_name":"Trächtler, Ansgar","id":"552","first_name":"Ansgar"},{"first_name":"Julian","full_name":"Rozo Vasquez, Julian","last_name":"Rozo Vasquez"},{"last_name":"Walther","full_name":"Walther, Frank","first_name":"Frank"}],"title":"α’-martensite grading techniques in reverse flow forming of AISI 304L","doi":"10.21741/9781644903254-76","quality_controlled":"1","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","year":"2024","intvolume":"        44","citation":{"ama":"Arian B, Homberg W, Kersting L, Trächtler A, Rozo Vasquez J, Walther F. α’-martensite grading techniques in reverse flow forming of AISI 304L. In: <i>Materials Research Proceedings</i>. Vol 44. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903254-76\">10.21741/9781644903254-76</a>","chicago":"Arian, Bahman, Werner Homberg, Lukas Kersting, Ansgar Trächtler, Julian Rozo Vasquez, and Frank Walther. “α’-Martensite Grading Techniques in Reverse Flow Forming of AISI 304L.” In <i>Materials Research Proceedings</i>, Vol. 44. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903254-76\">https://doi.org/10.21741/9781644903254-76</a>.","ieee":"B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, and F. Walther, “α’-martensite grading techniques in reverse flow forming of AISI 304L,” in <i>Materials Research Proceedings</i>, 2024, vol. 44, doi: <a href=\"https://doi.org/10.21741/9781644903254-76\">10.21741/9781644903254-76</a>.","apa":"Arian, B., Homberg, W., Kersting, L., Trächtler, A., Rozo Vasquez, J., &#38; Walther, F. (2024). α’-martensite grading techniques in reverse flow forming of AISI 304L. <i>Materials Research Proceedings</i>, <i>44</i>. <a href=\"https://doi.org/10.21741/9781644903254-76\">https://doi.org/10.21741/9781644903254-76</a>","short":"B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, F. Walther, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","mla":"Arian, Bahman, et al. “α’-Martensite Grading Techniques in Reverse Flow Forming of AISI 304L.” <i>Materials Research Proceedings</i>, vol. 44, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903254-76\">10.21741/9781644903254-76</a>.","bibtex":"@inproceedings{Arian_Homberg_Kersting_Trächtler_Rozo Vasquez_Walther_2024, title={α’-martensite grading techniques in reverse flow forming of AISI 304L}, volume={44}, DOI={<a href=\"https://doi.org/10.21741/9781644903254-76\">10.21741/9781644903254-76</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Arian, Bahman and Homberg, Werner and Kersting, Lukas and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}, year={2024} }"},"_id":"57173","department":[{"_id":"241"},{"_id":"153"},{"_id":"156"}],"user_id":"41470","language":[{"iso":"eng"}],"publication":"Materials Research Proceedings","type":"conference","abstract":[{"text":"Manufacturing processes benefit from property control enabling reproducibility, application oriented outcomes, and efficient part production. In reverse flow forming, state of the art practices focus primarily on geometry control, neglecting property control. Given the intricacies of the process involving the interaction of tool and machine behavior, process parameters, properties of semi finished products and temperatures, incorporating process control becomes an imperative for producing components with predefined properties. The property controlled within this reverse flow forming process is the local α’ martensite content. Therefore, process strategies to actively influence the α’ martensite content must be implemented. In this study seamless AISI 304L steel tubes are used, where α’ martensite formation is strain  and/or temperature induced through phase transformation within the process. This paper presents innovative process strategies, methods, and specially developed mechanical and thermal actuator systems to locally increase or suppress the α’ martensite content. The use and implementation of these approaches and tools allows the creation of unique optically invisible microstructure profiles containing 3D gradings, implying a radial grading of α’ martensite. The locally implemented α’ martensite, forming these 3D gradings, offers potential applications for functional or sensory purposes. This paper extends beyond theoretical concepts, providing tangible component outcomes.","lang":"eng"}],"status":"public"},{"doi":"10.21741/9781644903131-308","title":"Innovative control system for straightening machines using sensor information from downstream processes","author":[{"first_name":"Lukas","full_name":"Bathelt, Lukas","last_name":"Bathelt"},{"id":"7904","full_name":"Djakow, Eugen","last_name":"Djakow","first_name":"Eugen"},{"first_name":"Christian","last_name":"Henke","full_name":"Henke, Christian"},{"last_name":"Trächtler","id":"552","full_name":"Trächtler, Ansgar","first_name":"Ansgar"}],"date_created":"2024-11-18T10:08:22Z","volume":41,"publisher":"Materials Research Forum LLC","date_updated":"2024-11-18T10:42:37Z","citation":{"apa":"Bathelt, L., Djakow, E., Henke, C., &#38; Trächtler, A. (2024). Innovative control system for straightening machines using sensor information from downstream processes. <i>Materials Research Proceedings</i>, <i>41</i>. <a href=\"https://doi.org/10.21741/9781644903131-308\">https://doi.org/10.21741/9781644903131-308</a>","short":"L. Bathelt, E. Djakow, C. Henke, A. Trächtler, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","mla":"Bathelt, Lukas, et al. “Innovative Control System for Straightening Machines Using Sensor Information from Downstream Processes.” <i>Materials Research Proceedings</i>, vol. 41, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-308\">10.21741/9781644903131-308</a>.","bibtex":"@inproceedings{Bathelt_Djakow_Henke_Trächtler_2024, title={Innovative control system for straightening machines using sensor information from downstream processes}, volume={41}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-308\">10.21741/9781644903131-308</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Bathelt, Lukas and Djakow, Eugen and Henke, Christian and Trächtler, Ansgar}, year={2024} }","ama":"Bathelt L, Djakow E, Henke C, Trächtler A. Innovative control system for straightening machines using sensor information from downstream processes. In: <i>Materials Research Proceedings</i>. Vol 41. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-308\">10.21741/9781644903131-308</a>","ieee":"L. Bathelt, E. Djakow, C. Henke, and A. Trächtler, “Innovative control system for straightening machines using sensor information from downstream processes,” in <i>Materials Research Proceedings</i>, 2024, vol. 41, doi: <a href=\"https://doi.org/10.21741/9781644903131-308\">10.21741/9781644903131-308</a>.","chicago":"Bathelt, Lukas, Eugen Djakow, Christian Henke, and Ansgar Trächtler. “Innovative Control System for Straightening Machines Using Sensor Information from Downstream Processes.” In <i>Materials Research Proceedings</i>, Vol. 41. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-308\">https://doi.org/10.21741/9781644903131-308</a>."},"intvolume":"        41","year":"2024","publication_status":"published","publication_identifier":{"issn":["2474-395X"]},"quality_controlled":"1","language":[{"iso":"eng"}],"user_id":"41470","department":[{"_id":"241"},{"_id":"153"}],"_id":"57174","status":"public","abstract":[{"lang":"eng","text":"Increasing the sustainability and resource efficiency of forming processes is one of today's major goals. High-strength wire materials are usually available as strip material and are subjected to a downstream forming process such as punch-bending to produce parts for the electronics industry, for example. During the manufacturing process of the semi-finished product, residual stresses and plastic deformations are introduced into the wire by rolling and drawing processes. Straightening machines are used in the production lines to compensate for these. To increase the sustainability of these production lines, the straightening process is an essential step. Before the continuous manufacturing process starts, the straightening process must be set up and the optimal roller positions must be found. Once the process is set up, the roller position settings are usually not changed. Due to missing measurement systems for the straightening quality, it is not possible to dynamically adjust the positions of the straightening rollers to variations in the material properties. This leads to deviations in the dimensional accuracy of the components to be produced and thus to an increase in the rejection rate in the manufacturing processes. To reduce the rejection rate, a novel control system for a continuous feedback control of a straightening process is presented in this paper. This leads to a reduction of the rejection rate and unnecessary preforming operations in wire straightening process. The result is an increasing sustainability and efficiency of these production process."}],"type":"conference","publication":"Materials Research Proceedings"},{"publication":"Materials Research Proceedings","type":"conference","status":"public","abstract":[{"text":"The incremental flow forming process is currently enhanced in research context by special closed-loop property control concepts to increase the productivity and to control the product properties making invisible property structures like a magnetic barcode possible. However, it is preferred to establish property control concepts on single roller machines instead of conventional machines with three roller actuation due to the better machine accessibility. For those single roller machines, rather poor surface qualities of flow formed workpieces were observed in the past especially for hydraulic actuators. Thus, a new actuator closed-loop position control concept is developed in this paper using model-based control design methods and taking the flow forming forces as a load into account. The novel closed-loop control is validated during workpiece production at the actual single roller flow forming machine. An analysis of the manufactured workpieces show that the surface quality is significantly enhanced by the new control to a roughness level almost similar to conventional three roller flow forming. Thus, a sincere added value to the flow forming process is offered by the novel actuator closed-loop position control.","lang":"eng"}],"department":[{"_id":"153"},{"_id":"241"},{"_id":"156"}],"user_id":"41470","_id":"57178","language":[{"iso":"eng"}],"quality_controlled":"1","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","intvolume":"        41","citation":{"short":"L. Kersting, S. Sander, B. Arian, J. Rozo Vasquez, A. Trächtler, W. Homberg, F. Walther, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","bibtex":"@inproceedings{Kersting_Sander_Arian_Rozo Vasquez_Trächtler_Homberg_Walther_2024, title={Improving the flow forming process by a novel closed-loop control}, volume={41}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-158\">10.21741/9781644903131-158</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Kersting, Lukas and Sander, Sebastian and Arian, Bahman and Rozo Vasquez, Julian and Trächtler, Ansgar and Homberg, Werner and Walther, Frank}, year={2024} }","mla":"Kersting, Lukas, et al. “Improving the Flow Forming Process by a Novel Closed-Loop Control.” <i>Materials Research Proceedings</i>, vol. 41, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-158\">10.21741/9781644903131-158</a>.","apa":"Kersting, L., Sander, S., Arian, B., Rozo Vasquez, J., Trächtler, A., Homberg, W., &#38; Walther, F. (2024). Improving the flow forming process by a novel closed-loop control. <i>Materials Research Proceedings</i>, <i>41</i>. <a href=\"https://doi.org/10.21741/9781644903131-158\">https://doi.org/10.21741/9781644903131-158</a>","ama":"Kersting L, Sander S, Arian B, et al. Improving the flow forming process by a novel closed-loop control. In: <i>Materials Research Proceedings</i>. Vol 41. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-158\">10.21741/9781644903131-158</a>","ieee":"L. Kersting <i>et al.</i>, “Improving the flow forming process by a novel closed-loop control,” in <i>Materials Research Proceedings</i>, 2024, vol. 41, doi: <a href=\"https://doi.org/10.21741/9781644903131-158\">10.21741/9781644903131-158</a>.","chicago":"Kersting, Lukas, Sebastian Sander, Bahman Arian, Julian Rozo Vasquez, Ansgar Trächtler, Werner Homberg, and Frank Walther. “Improving the Flow Forming Process by a Novel Closed-Loop Control.” In <i>Materials Research Proceedings</i>, Vol. 41. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-158\">https://doi.org/10.21741/9781644903131-158</a>."},"year":"2024","volume":41,"date_created":"2024-11-18T10:11:24Z","author":[{"full_name":"Kersting, Lukas","last_name":"Kersting","first_name":"Lukas"},{"first_name":"Sebastian","last_name":"Sander","full_name":"Sander, Sebastian"},{"last_name":"Arian","full_name":"Arian, Bahman","id":"36287","first_name":"Bahman"},{"first_name":"Julian","full_name":"Rozo Vasquez, Julian","last_name":"Rozo Vasquez"},{"first_name":"Ansgar","last_name":"Trächtler","id":"552","full_name":"Trächtler, Ansgar"},{"first_name":"Werner","last_name":"Homberg","id":"233","full_name":"Homberg, Werner"},{"first_name":"Frank","last_name":"Walther","full_name":"Walther, Frank"}],"publisher":"Materials Research Forum LLC","date_updated":"2024-11-18T10:41:46Z","doi":"10.21741/9781644903131-158","title":"Improving the flow forming process by a novel closed-loop control"},{"status":"public","abstract":[{"lang":"eng","text":"In multi-stage bending and straightening operations cross-stage and quantity-dependent effects crucially affect the quality of the end product. Using punch-bending units in combination with a mechatronic straightening device can improve the accuracy and repeatability of product features remarkably well. In this work a concept for an innovative hybrid model of a roll straightener in a multi-stage straightening and multi-stage bending process is proposed. This model combines data-driven elements with expert knowledge and aims to minimise residual errors of the roll straightener to reliably decrease the risk of disadvantageous cross-stage and quantity-dependent effects on a subsequent punch-bending process."}],"type":"conference","publication":"Materials Research Proceedings","language":[{"iso":"eng"}],"user_id":"41470","department":[{"_id":"153"},{"_id":"241"},{"_id":"156"}],"_id":"57183","citation":{"apa":"Peters, H., Djakow, E., Rostek, T., Mazur, A., Trächtler, A., Homberg, W., &#38; Hammer, B. (2024). Novel approach for data-driven modelling of multi-stage straightening and bending processes. <i>Materials Research Proceedings</i>, <i>41</i>. <a href=\"https://doi.org/10.21741/9781644903131-252\">https://doi.org/10.21741/9781644903131-252</a>","mla":"Peters, Henning, et al. “Novel Approach for Data-Driven Modelling of Multi-Stage Straightening and Bending Processes.” <i>Materials Research Proceedings</i>, vol. 41, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-252\">10.21741/9781644903131-252</a>.","short":"H. Peters, E. Djakow, T. Rostek, A. Mazur, A. Trächtler, W. Homberg, B. Hammer, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","bibtex":"@inproceedings{Peters_Djakow_Rostek_Mazur_Trächtler_Homberg_Hammer_2024, title={Novel approach for data-driven modelling of multi-stage straightening and bending processes}, volume={41}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-252\">10.21741/9781644903131-252</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Peters, Henning and Djakow, Eugen and Rostek, Tim and Mazur, Andreas and Trächtler, Ansgar and Homberg, Werner and Hammer, Barbara}, year={2024} }","ieee":"H. Peters <i>et al.</i>, “Novel approach for data-driven modelling of multi-stage straightening and bending processes,” in <i>Materials Research Proceedings</i>, 2024, vol. 41, doi: <a href=\"https://doi.org/10.21741/9781644903131-252\">10.21741/9781644903131-252</a>.","chicago":"Peters, Henning, Eugen Djakow, Tim Rostek, Andreas Mazur, Ansgar Trächtler, Werner Homberg, and Barbara Hammer. “Novel Approach for Data-Driven Modelling of Multi-Stage Straightening and Bending Processes.” In <i>Materials Research Proceedings</i>, Vol. 41. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-252\">https://doi.org/10.21741/9781644903131-252</a>.","ama":"Peters H, Djakow E, Rostek T, et al. Novel approach for data-driven modelling of multi-stage straightening and bending processes. In: <i>Materials Research Proceedings</i>. Vol 41. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-252\">10.21741/9781644903131-252</a>"},"intvolume":"        41","year":"2024","publication_status":"published","publication_identifier":{"issn":["2474-395X"]},"quality_controlled":"1","doi":"10.21741/9781644903131-252","title":"Novel approach for data-driven modelling of multi-stage straightening and bending processes","author":[{"last_name":"Peters","full_name":"Peters, Henning","first_name":"Henning"},{"first_name":"Eugen","last_name":"Djakow","id":"7904","full_name":"Djakow, Eugen"},{"first_name":"Tim","full_name":"Rostek, Tim","id":"3469","last_name":"Rostek"},{"first_name":"Andreas","full_name":"Mazur, Andreas","last_name":"Mazur"},{"id":"552","full_name":"Trächtler, Ansgar","last_name":"Trächtler","first_name":"Ansgar"},{"first_name":"Werner","last_name":"Homberg","id":"233","full_name":"Homberg, Werner"},{"first_name":"Barbara","full_name":"Hammer, Barbara","last_name":"Hammer"}],"date_created":"2024-11-18T10:15:37Z","volume":41,"publisher":"Materials Research Forum LLC","date_updated":"2024-11-18T10:40:50Z"},{"language":[{"iso":"eng"}],"_id":"57171","user_id":"41470","department":[{"_id":"241"},{"_id":"153"},{"_id":"156"}],"abstract":[{"lang":"eng","text":"In manufacturing, property control ensures efficient part production. However, in reverse flow forming, current practices focus on geometry control rather than property control. To address the complexity of the process and tool machine interaction, process control is crucial for defined component properties. This study focuses on controlling local α’ martensite content in reverse flow forming of seamless AISI 304L steel tubes. Strategies and systems are presented to influence α’ martensite content, creating unique microstructure profiles for 1D  and 2D Gradings, with tangible component outcomes."}],"status":"public","type":"conference","publication":"Materials Research Proceedings","title":"Thermomechanical reverse flow forming of AISI 304L","doi":"10.21741/9781644903131-151","date_updated":"2024-11-18T10:42:49Z","publisher":"Materials Research Forum LLC","date_created":"2024-11-18T10:02:38Z","author":[{"id":"36287","full_name":"Arian, Bahman","last_name":"Arian","first_name":"Bahman"},{"last_name":"Homberg","full_name":"Homberg, Werner","id":"233","first_name":"Werner"},{"first_name":"Lukas","full_name":"Kersting, Lukas","last_name":"Kersting"},{"id":"552","full_name":"Trächtler, Ansgar","last_name":"Trächtler","first_name":"Ansgar"},{"last_name":"Rozo Vasquez","full_name":"Rozo Vasquez, Julian","first_name":"Julian"},{"full_name":"Walther, Frank","last_name":"Walther","first_name":"Frank"}],"volume":41,"year":"2024","citation":{"ama":"Arian B, Homberg W, Kersting L, Trächtler A, Rozo Vasquez J, Walther F. Thermomechanical reverse flow forming of AISI 304L. In: <i>Materials Research Proceedings</i>. Vol 41. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-151\">10.21741/9781644903131-151</a>","chicago":"Arian, Bahman, Werner Homberg, Lukas Kersting, Ansgar Trächtler, Julian Rozo Vasquez, and Frank Walther. “Thermomechanical Reverse Flow Forming of AISI 304L.” In <i>Materials Research Proceedings</i>, Vol. 41. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-151\">https://doi.org/10.21741/9781644903131-151</a>.","ieee":"B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, and F. Walther, “Thermomechanical reverse flow forming of AISI 304L,” in <i>Materials Research Proceedings</i>, 2024, vol. 41, doi: <a href=\"https://doi.org/10.21741/9781644903131-151\">10.21741/9781644903131-151</a>.","mla":"Arian, Bahman, et al. “Thermomechanical Reverse Flow Forming of AISI 304L.” <i>Materials Research Proceedings</i>, vol. 41, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-151\">10.21741/9781644903131-151</a>.","bibtex":"@inproceedings{Arian_Homberg_Kersting_Trächtler_Rozo Vasquez_Walther_2024, title={Thermomechanical reverse flow forming of AISI 304L}, volume={41}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-151\">10.21741/9781644903131-151</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Arian, Bahman and Homberg, Werner and Kersting, Lukas and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}, year={2024} }","short":"B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, F. Walther, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","apa":"Arian, B., Homberg, W., Kersting, L., Trächtler, A., Rozo Vasquez, J., &#38; Walther, F. (2024). Thermomechanical reverse flow forming of AISI 304L. <i>Materials Research Proceedings</i>, <i>41</i>. <a href=\"https://doi.org/10.21741/9781644903131-151\">https://doi.org/10.21741/9781644903131-151</a>"},"intvolume":"        41","publication_status":"published","publication_identifier":{"issn":["2474-395X"]},"quality_controlled":"1"},{"conference":{"location":"Toulouse","name":"ESAFORM 2024"},"doi":"10.21741/9781644903131-180","title":"Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation","author":[{"last_name":"Borgert","full_name":"Borgert, Thomas","id":"83141","first_name":"Thomas"},{"full_name":"Nordieker, Ansgar Bernhard","id":"88725","last_name":"Nordieker","first_name":"Ansgar Bernhard"},{"first_name":"Werner","last_name":"Homberg","full_name":"Homberg, Werner","id":"233"}],"date_created":"2024-06-07T09:38:45Z","publisher":"Materials Research Forum LLC","date_updated":"2025-09-22T05:45:37Z","citation":{"mla":"Borgert, Thomas, et al. “Form-Based Manufacturing of Aluminium and Steel Auxiliary Joining Elements as the Basis for an Efficient Joining Operation.” <i>Materials Research Proceedings</i>, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-180\">10.21741/9781644903131-180</a>.","bibtex":"@inproceedings{Borgert_Nordieker_Homberg_2024, title={Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-180\">10.21741/9781644903131-180</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Borgert, Thomas and Nordieker, Ansgar Bernhard and Homberg, Werner}, year={2024} }","short":"T. Borgert, A.B. Nordieker, W. Homberg, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.","apa":"Borgert, T., Nordieker, A. B., &#38; Homberg, W. (2024). Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation. <i>Materials Research Proceedings</i>. ESAFORM 2024, Toulouse. <a href=\"https://doi.org/10.21741/9781644903131-180\">https://doi.org/10.21741/9781644903131-180</a>","chicago":"Borgert, Thomas, Ansgar Bernhard Nordieker, and Werner Homberg. “Form-Based Manufacturing of Aluminium and Steel Auxiliary Joining Elements as the Basis for an Efficient Joining Operation.” In <i>Materials Research Proceedings</i>. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-180\">https://doi.org/10.21741/9781644903131-180</a>.","ieee":"T. Borgert, A. B. Nordieker, and W. Homberg, “Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation,” presented at the ESAFORM 2024, Toulouse, 2024, doi: <a href=\"https://doi.org/10.21741/9781644903131-180\">10.21741/9781644903131-180</a>.","ama":"Borgert T, Nordieker AB, Homberg W. Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation. In: <i>Materials Research Proceedings</i>. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-180\">10.21741/9781644903131-180</a>"},"year":"2024","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","language":[{"iso":"eng"}],"department":[{"_id":"156"}],"user_id":"88725","_id":"54650","project":[{"name":"TRR 285 - Project Area C","_id":"133"},{"_id":"147","name":"TRR 285 - Subproject C03"}],"status":"public","abstract":[{"lang":"eng","text":"<jats:p>Abstract. Reducing the weight of vehicles can significantly lower the energy or fuel consumed and thus the emissions during operation. One possibility to assess this is the use of a property adapted multi-material systems containing high strength steel, light metals like aluminium or magnesium and fibre reinforced plastics. While expanding the number of materials used new challenges arise for the production and furthermore the joining technology to manufacture the vehicle made of the multi-material systems. One approach to overcome these challenges is to use innovative and adaptable joining techniques which allows the manufacturing of joints of different material combinations. Extensive research activities on the two stage thermo-mechanical joining process with adaptable joining elements was able to demonstrate the great potentials in terms of joining dissimilar materials with good strength. The previously kinematic and path-based fabrication of auxiliary joining elements is modified in this publication to a form-based approach with a perspective of establishing an efficient process chain using easily and cheaply available rods. Based on the new approach to produce the auxiliary joining elements, it can be demonstrated that a reproducible production of the geometry is possible for the investigated steel as well as aluminium material. </jats:p>"}],"publication":"Materials Research Proceedings","type":"conference"},{"title":"Innovative self-learning disturbance compensation for straightening processes","doi":"10.21741/9781644902479-216","date_updated":"2023-10-31T14:31:51Z","publisher":"Materials Research Forum LLC","author":[{"first_name":"Lukas","last_name":"Bathelt","full_name":"Bathelt, Lukas"},{"first_name":"Eugen","full_name":"Djakow, Eugen","id":"7904","last_name":"Djakow"},{"full_name":"Henke, Christian","last_name":"Henke","first_name":"Christian"},{"first_name":"Ansgar","id":"552","full_name":"Trächtler, Ansgar","last_name":"Trächtler"}],"date_created":"2023-10-31T14:08:16Z","year":"2023","citation":{"bibtex":"@inproceedings{Bathelt_Djakow_Henke_Trächtler_2023, title={Innovative self-learning disturbance compensation for straightening processes}, DOI={<a href=\"https://doi.org/10.21741/9781644902479-216\">10.21741/9781644902479-216</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Bathelt, Lukas and Djakow, Eugen and Henke, Christian and Trächtler, Ansgar}, year={2023} }","mla":"Bathelt, Lukas, et al. “Innovative Self-Learning Disturbance Compensation for Straightening Processes.” <i>Materials Research Proceedings</i>, Materials Research Forum LLC, 2023, doi:<a href=\"https://doi.org/10.21741/9781644902479-216\">10.21741/9781644902479-216</a>.","short":"L. Bathelt, E. Djakow, C. Henke, A. Trächtler, in: Materials Research Proceedings, Materials Research Forum LLC, 2023.","apa":"Bathelt, L., Djakow, E., Henke, C., &#38; Trächtler, A. (2023). Innovative self-learning disturbance compensation for straightening processes. <i>Materials Research Proceedings</i>. <a href=\"https://doi.org/10.21741/9781644902479-216\">https://doi.org/10.21741/9781644902479-216</a>","ama":"Bathelt L, Djakow E, Henke C, Trächtler A. Innovative self-learning disturbance compensation for straightening processes. In: <i>Materials Research Proceedings</i>. Materials Research Forum LLC; 2023. doi:<a href=\"https://doi.org/10.21741/9781644902479-216\">10.21741/9781644902479-216</a>","chicago":"Bathelt, Lukas, Eugen Djakow, Christian Henke, and Ansgar Trächtler. “Innovative Self-Learning Disturbance Compensation for Straightening Processes.” In <i>Materials Research Proceedings</i>. Materials Research Forum LLC, 2023. <a href=\"https://doi.org/10.21741/9781644902479-216\">https://doi.org/10.21741/9781644902479-216</a>.","ieee":"L. Bathelt, E. Djakow, C. Henke, and A. Trächtler, “Innovative self-learning disturbance compensation for straightening processes,” 2023, doi: <a href=\"https://doi.org/10.21741/9781644902479-216\">10.21741/9781644902479-216</a>."},"publication_status":"published","quality_controlled":"1","publication_identifier":{"issn":["2474-395X"]},"language":[{"iso":"eng"}],"_id":"48572","user_id":"41470","department":[{"_id":"153"},{"_id":"241"}],"abstract":[{"text":"<jats:p>Abstract. To increase the sustainability of forming processes such as punch bending, homogenization of the processed semi-finished product is an essential step in the manufacturing process. High-strength wire materials are usually available as strip material before being further processed in a forming process. For storage and transport, the material is coiled onto coils and transported to the customer. During the coiling process, residual stresses and plastic deformation are introduced into the wire. Thus, the final product quality is also influenced by the geometry of the coil. Straightening machines are used in production lines to compensate for these. Once a straightening machine has been set up, the settings for the roll positions are usually not changed. As a result, there is no reaction to material fluctuations, which means that the components to be produced do not meet the dimensional accuracy requirements. This leads to an increase in the rejection rate in manufacturing processes. To reduce the rejection rate, it is necessary to enable dynamic and flexible infeed of the straightening rollers. In this context, an innovative control concept with disturbance compensation was developed for the straightening process. The disturbance compensation uses a disturbance model that predicts the change in bending curvature over the coil radius. With this prediction, the straightening machine can be adjusted specifically. The roller positions are adjusted by a subordinate position control. The additional feedback from measured geometric product properties from the following punching-bending process enables the straightening machine to be adjusted even in the case of unforeseen fluctuations in the material properties. In this way, it is possible to react to any material fluctuations as required. This novel, demand-oriented adjustment of the straightening machine is expected to result in a high increase in the efficiency of the production process and a reduction of the rejection rate. </jats:p>","lang":"eng"}],"status":"public","type":"conference","publication":"Materials Research Proceedings"},{"citation":{"chicago":"Arian, Bahman, Werner Homberg, Lukas Kersting, Ansgar Trächtler, Julian Rozo Vasquez, and Frank Walther. “Cryogenic Reverse Flow Forming of AISI 304L.” In <i>Materials Research Proceedings</i>. Materials Research Forum LLC, 2023. <a href=\"https://doi.org/10.21741/9781644902479-219\">https://doi.org/10.21741/9781644902479-219</a>.","ieee":"B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, and F. Walther, “Cryogenic reverse flow forming of AISI 304L,” 2023, doi: <a href=\"https://doi.org/10.21741/9781644902479-219\">10.21741/9781644902479-219</a>.","ama":"Arian B, Homberg W, Kersting L, Trächtler A, Rozo Vasquez J, Walther F. Cryogenic reverse flow forming of AISI 304L. In: <i>Materials Research Proceedings</i>. Materials Research Forum LLC; 2023. doi:<a href=\"https://doi.org/10.21741/9781644902479-219\">10.21741/9781644902479-219</a>","apa":"Arian, B., Homberg, W., Kersting, L., Trächtler, A., Rozo Vasquez, J., &#38; Walther, F. (2023). Cryogenic reverse flow forming of AISI 304L. <i>Materials Research Proceedings</i>. <a href=\"https://doi.org/10.21741/9781644902479-219\">https://doi.org/10.21741/9781644902479-219</a>","short":"B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, F. Walther, in: Materials Research Proceedings, Materials Research Forum LLC, 2023.","bibtex":"@inproceedings{Arian_Homberg_Kersting_Trächtler_Rozo Vasquez_Walther_2023, title={Cryogenic reverse flow forming of AISI 304L}, DOI={<a href=\"https://doi.org/10.21741/9781644902479-219\">10.21741/9781644902479-219</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Arian, Bahman and Homberg, Werner and Kersting, Lukas and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}, year={2023} }","mla":"Arian, Bahman, et al. “Cryogenic Reverse Flow Forming of AISI 304L.” <i>Materials Research Proceedings</i>, Materials Research Forum LLC, 2023, doi:<a href=\"https://doi.org/10.21741/9781644902479-219\">10.21741/9781644902479-219</a>."},"year":"2023","publication_status":"published","publication_identifier":{"issn":["2474-395X"]},"quality_controlled":"1","main_file_link":[{"open_access":"1","url":"https://www.mrforum.com/product/9781644902479-219/"}],"doi":"10.21741/9781644902479-219","title":"Cryogenic reverse flow forming of AISI 304L","author":[{"last_name":"Arian","id":"36287","full_name":"Arian, Bahman","first_name":"Bahman"},{"id":"233","full_name":"Homberg, Werner","last_name":"Homberg","first_name":"Werner"},{"full_name":"Kersting, Lukas","last_name":"Kersting","first_name":"Lukas"},{"last_name":"Trächtler","id":"552","full_name":"Trächtler, Ansgar","first_name":"Ansgar"},{"last_name":"Rozo Vasquez","full_name":"Rozo Vasquez, Julian","first_name":"Julian"},{"last_name":"Walther","full_name":"Walther, Frank","first_name":"Frank"}],"date_created":"2023-05-02T09:43:25Z","publisher":"Materials Research Forum LLC","oa":"1","date_updated":"2023-12-15T09:32:05Z","status":"public","abstract":[{"lang":"eng","text":"<jats:p>Abstract. Workpiece property-control permits the application-oriented and time-efficient production of components. In reverse flow forming, for example, a control of the microstructure profile is not yet part of the state of the art, in contrast to the geometry control. This is, due to several reasons, particularly challenging when forming seamless tubes made of metastable austenitic stainless AISI 304L steel. Inducing mechanical and/or thermal energy can cause a phase transformation from austenite to martensite within this steel. The resulting α’-martensite has different mechanical and micromagnetic properties, which can be advantageous depending on the application. For purposes of local property control, the resulting α’-martensite content should be measured and controlled online during the forming process. This paper presents results from the usage of a custom developed cryo-system and different application strategies to use liquid nitrogen as a coolant for local enhancement of the forming-temperature depending α’-martensite content. </jats:p>"}],"type":"conference","publication":"Materials Research Proceedings","language":[{"iso":"eng"}],"user_id":"36287","department":[{"_id":"156"},{"_id":"241"},{"_id":"153"}],"_id":"44314"},{"type":"conference","publication":"Materials Research Proceedings","status":"public","abstract":[{"lang":"eng","text":"<jats:p>Abstract. The application of the mechanical joining process clinching allows the assembly of different sheet metal materials with a wide range of material thickness configurations, which is of interest for lightweight multi-material structures. In order to be able to predict the clinched joint properties as a function of the individual manufacturing steps, current studies focus on numerical modeling of the entire clinching process chain. It is essential to be able to take into account the influence of the joining process-induced damage on the load-bearing capacity of the joint during the loading phase. This study presents a numerical damage accumulation in the clinching process based on an implemented Hosford-Coulomb failure model using a 3D clinching process model applied on the aluminum alloy EN AW-6014 in temper T4. A correspondence of the experimentally determined failure location with the element of the highest numerically determined damage accumulation is shown. Moreover, the experimentally determined failure behavior is predicted to be in agreement in the numerical loading simulation with transferred pre-damage from the process simulation. </jats:p>"}],"user_id":"45779","department":[{"_id":"157"}],"project":[{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"_id":"139","name":"TRR 285 – A05: TRR 285 - Subproject A05"}],"_id":"43090","language":[{"iso":"eng"}],"publication_status":"published","quality_controlled":"1","publication_identifier":{"issn":["2474-395X"]},"citation":{"mla":"Bielak, Christian Roman, et al. “Numerical Analysis of Failure Modeling in Clinching Process Chain Simulation.” <i>Materials Research Proceedings</i>, Materials Research Forum LLC, 2023, doi:<a href=\"https://doi.org/10.21741/9781644902417-33\">10.21741/9781644902417-33</a>.","short":"C.R. Bielak, M. Böhnke, J. Friedlein, M. Bobbert, J. Mergheim, P. Steinmann, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2023.","bibtex":"@inproceedings{Bielak_Böhnke_Friedlein_Bobbert_Mergheim_Steinmann_Meschut_2023, title={Numerical analysis of failure modeling in clinching process chain simulation}, DOI={<a href=\"https://doi.org/10.21741/9781644902417-33\">10.21741/9781644902417-33</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Bielak, Christian Roman and Böhnke, Max and Friedlein, Johannes and Bobbert, Mathias and Mergheim, Julia and Steinmann, Paul and Meschut, Gerson}, year={2023} }","apa":"Bielak, C. R., Böhnke, M., Friedlein, J., Bobbert, M., Mergheim, J., Steinmann, P., &#38; Meschut, G. (2023). Numerical analysis of failure modeling in clinching process chain simulation. <i>Materials Research Proceedings</i>. SHEMET 2023. <a href=\"https://doi.org/10.21741/9781644902417-33\">https://doi.org/10.21741/9781644902417-33</a>","ieee":"C. R. Bielak <i>et al.</i>, “Numerical analysis of failure modeling in clinching process chain simulation,” presented at the SHEMET 2023, 2023, doi: <a href=\"https://doi.org/10.21741/9781644902417-33\">10.21741/9781644902417-33</a>.","chicago":"Bielak, Christian Roman, Max Böhnke, Johannes Friedlein, Mathias Bobbert, Julia Mergheim, Paul Steinmann, and Gerson Meschut. “Numerical Analysis of Failure Modeling in Clinching Process Chain Simulation.” In <i>Materials Research Proceedings</i>. Materials Research Forum LLC, 2023. <a href=\"https://doi.org/10.21741/9781644902417-33\">https://doi.org/10.21741/9781644902417-33</a>.","ama":"Bielak CR, Böhnke M, Friedlein J, et al. Numerical analysis of failure modeling in clinching process chain simulation. In: <i>Materials Research Proceedings</i>. Materials Research Forum LLC; 2023. doi:<a href=\"https://doi.org/10.21741/9781644902417-33\">10.21741/9781644902417-33</a>"},"year":"2023","date_created":"2023-03-23T08:13:30Z","author":[{"last_name":"Bielak","id":"34782","full_name":"Bielak, Christian Roman","first_name":"Christian Roman"},{"id":"45779","full_name":"Böhnke, Max","last_name":"Böhnke","first_name":"Max"},{"last_name":"Friedlein","full_name":"Friedlein, Johannes","first_name":"Johannes"},{"first_name":"Mathias","full_name":"Bobbert, Mathias","id":"7850","last_name":"Bobbert"},{"last_name":"Mergheim","full_name":"Mergheim, Julia","first_name":"Julia"},{"first_name":"Paul","last_name":"Steinmann","full_name":"Steinmann, Paul"},{"first_name":"Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","full_name":"Meschut, Gerson","id":"32056"}],"date_updated":"2024-03-11T08:14:08Z","publisher":"Materials Research Forum LLC","doi":"10.21741/9781644902417-33","conference":{"name":"SHEMET 2023"},"title":"Numerical analysis of failure modeling in clinching process chain simulation"},{"_id":"43462","project":[{"name":"TRR 285: TRR 285","_id":"130","grant_number":"418701707"},{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"_id":"139","name":"TRR 285 – A05: TRR 285 - Subproject A05"}],"department":[{"_id":"157"}],"user_id":"45779","language":[{"iso":"eng"}],"publication":"Materials Research Proceedings","type":"conference","abstract":[{"lang":"eng","text":"<jats:p>Abstract. In the numerical simulation of mechanical joining technologies such as clinching, the material modeling of the joining parts is of major importance. This includes modeling the damage and failure behavior of the materials in accordance with varying occurring stress states. This paper presents a calibration method of three different fracture models. The calibration of the models is done by use of experimental data from a modified punch test, tensile test and bulge test in order to map the occurring stress states from clinching processes and to precisely model the resulting failure behavior. Experimental investigations were carried out for an aluminum alloy  EN AW-6014 in temper T4 and compared with the simulative results generated in LS-DYNA. The comparison of force-displacement curves and failure initiation shows that the Hosford–Coulomb model predicts the failure behavior for the material used and the tests applied with the best accuracy. </jats:p>"}],"status":"public","publisher":"Materials Research Forum LLC","date_updated":"2024-03-11T08:14:53Z","author":[{"full_name":"Böhnke, Max","id":"45779","last_name":"Böhnke","first_name":"Max"},{"first_name":"Christian Roman","id":"34782","full_name":"Bielak, Christian Roman","last_name":"Bielak"},{"last_name":"Friedlein","full_name":"Friedlein, Johannes","first_name":"Johannes"},{"first_name":"Mathias","last_name":"Bobbert","full_name":"Bobbert, Mathias","id":"7850"},{"first_name":"Julia","full_name":"Mergheim, Julia","last_name":"Mergheim"},{"first_name":"Paul","last_name":"Steinmann","full_name":"Steinmann, Paul"},{"full_name":"Meschut, Gerson","id":"32056","last_name":"Meschut","orcid":"0000-0002-2763-1246","first_name":"Gerson"}],"date_created":"2023-04-13T07:42:53Z","title":"A calibration method for failure modeling in clinching process simulations","doi":"10.21741/9781644902417-34","quality_controlled":"1","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","year":"2023","citation":{"ieee":"M. Böhnke <i>et al.</i>, “A calibration method for failure modeling in clinching process simulations,” 2023, doi: <a href=\"https://doi.org/10.21741/9781644902417-34\">10.21741/9781644902417-34</a>.","chicago":"Böhnke, Max, Christian Roman Bielak, Johannes Friedlein, Mathias Bobbert, Julia Mergheim, Paul Steinmann, and Gerson Meschut. “A Calibration Method for Failure Modeling in Clinching Process Simulations.” In <i>Materials Research Proceedings</i>. Materials Research Forum LLC, 2023. <a href=\"https://doi.org/10.21741/9781644902417-34\">https://doi.org/10.21741/9781644902417-34</a>.","ama":"Böhnke M, Bielak CR, Friedlein J, et al. A calibration method for failure modeling in clinching process simulations. In: <i>Materials Research Proceedings</i>. Materials Research Forum LLC; 2023. doi:<a href=\"https://doi.org/10.21741/9781644902417-34\">10.21741/9781644902417-34</a>","apa":"Böhnke, M., Bielak, C. R., Friedlein, J., Bobbert, M., Mergheim, J., Steinmann, P., &#38; Meschut, G. (2023). A calibration method for failure modeling in clinching process simulations. <i>Materials Research Proceedings</i>. <a href=\"https://doi.org/10.21741/9781644902417-34\">https://doi.org/10.21741/9781644902417-34</a>","mla":"Böhnke, Max, et al. “A Calibration Method for Failure Modeling in Clinching Process Simulations.” <i>Materials Research Proceedings</i>, Materials Research Forum LLC, 2023, doi:<a href=\"https://doi.org/10.21741/9781644902417-34\">10.21741/9781644902417-34</a>.","bibtex":"@inproceedings{Böhnke_Bielak_Friedlein_Bobbert_Mergheim_Steinmann_Meschut_2023, title={A calibration method for failure modeling in clinching process simulations}, DOI={<a href=\"https://doi.org/10.21741/9781644902417-34\">10.21741/9781644902417-34</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Böhnke, Max and Bielak, Christian Roman and Friedlein, Johannes and Bobbert, Mathias and Mergheim, Julia and Steinmann, Paul and Meschut, Gerson}, year={2023} }","short":"M. Böhnke, C.R. Bielak, J. Friedlein, M. Bobbert, J. Mergheim, P. Steinmann, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2023."}},{"user_id":"32340","department":[{"_id":"156"},{"_id":"158"}],"project":[{"name":"TRR 285 – C03: TRR 285 - Subproject C03","_id":"147"},{"name":"TRR 285 – A02: TRR 285 - Subproject A02","_id":"136"}],"_id":"43031","type":"conference","status":"public","author":[{"last_name":"Borgert","full_name":"Borgert, Thomas","id":"83141","first_name":"Thomas"},{"last_name":"Neuser","full_name":"Neuser, Moritz","id":"32340","first_name":"Moritz"},{"first_name":"Eugen","last_name":"Wiens","full_name":"Wiens, Eugen","id":"7888"},{"first_name":"Olexandr","last_name":"Grydin","full_name":"Grydin, Olexandr","id":"43822"},{"first_name":"Werner","full_name":"Homberg, Werner","id":"233","last_name":"Homberg"},{"full_name":"Schaper, Mirko","id":"43720","last_name":"Schaper","first_name":"Mirko"}],"volume":25,"date_updated":"2024-03-14T15:22:17Z","conference":{"start_date":"02.04.2023","name":"20th International Conference on Sheet Metal","location":"Nürnberg","end_date":"05.04.2023"},"doi":"10.21741/9781644902417-24","publication_status":"published","publication_identifier":{"issn":["2474-395X"]},"citation":{"bibtex":"@inproceedings{Borgert_Neuser_Wiens_Grydin_Homberg_Schaper_2023, title={Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy}, volume={25}, DOI={<a href=\"https://doi.org/10.21741/9781644902417-24\">10.21741/9781644902417-24</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Borgert, Thomas and Neuser, Moritz and Wiens, Eugen and Grydin, Olexandr and Homberg, Werner and Schaper, Mirko}, year={2023}, pages={187–194} }","mla":"Borgert, Thomas, et al. “Influence of Thermo-Mechanical Joining Process on the Microstructure of a Hypoeutectic Aluminium Cast Alloy.” <i>Materials Research Proceedings</i>, vol. 25, Materials Research Forum LLC, 2023, pp. 187–94, doi:<a href=\"https://doi.org/10.21741/9781644902417-24\">10.21741/9781644902417-24</a>.","short":"T. Borgert, M. Neuser, E. Wiens, O. Grydin, W. Homberg, M. Schaper, in: Materials Research Proceedings, Materials Research Forum LLC, 2023, pp. 187–194.","apa":"Borgert, T., Neuser, M., Wiens, E., Grydin, O., Homberg, W., &#38; Schaper, M. (2023). Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy. <i>Materials Research Proceedings</i>, <i>25</i>, 187–194. <a href=\"https://doi.org/10.21741/9781644902417-24\">https://doi.org/10.21741/9781644902417-24</a>","ama":"Borgert T, Neuser M, Wiens E, Grydin O, Homberg W, Schaper M. Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy. In: <i>Materials Research Proceedings</i>. Vol 25. Materials Research Forum LLC; 2023:187-194. doi:<a href=\"https://doi.org/10.21741/9781644902417-24\">10.21741/9781644902417-24</a>","ieee":"T. Borgert, M. Neuser, E. Wiens, O. Grydin, W. Homberg, and M. Schaper, “Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy,” in <i>Materials Research Proceedings</i>, Nürnberg, 2023, vol. 25, pp. 187–194, doi: <a href=\"https://doi.org/10.21741/9781644902417-24\">10.21741/9781644902417-24</a>.","chicago":"Borgert, Thomas, Moritz Neuser, Eugen Wiens, Olexandr Grydin, Werner Homberg, and Mirko Schaper. “Influence of Thermo-Mechanical Joining Process on the Microstructure of a Hypoeutectic Aluminium Cast Alloy.” In <i>Materials Research Proceedings</i>, 25:187–94. Materials Research Forum LLC, 2023. <a href=\"https://doi.org/10.21741/9781644902417-24\">https://doi.org/10.21741/9781644902417-24</a>."},"intvolume":"        25","page":"187-194","language":[{"iso":"eng"}],"publication":"Materials Research Proceedings","abstract":[{"text":"<jats:p>Abstract. Requirements of multi-material construction involve adjustments to standard joining techniques. Especially the growing importance of integral cast components poses additional engineering challenges for the industry. One approach to achieve these goals are adaptable joining elements formed by friction spinning. This approach uses friction-induced heat to form customisable joining elements to join sheets for different boundary conditions, even for brittle cast materials. It is possible to react immediately to adapt to the joining process inline and reduce the amount of different joining elements. As the joining partner serve casting plates of the aluminium casting alloy EN AC–AlSi9, which is processed in the sand casting. Joining hypoeutectic AlSi alloys constitutes a challenge because the brittle character of these cause cracks in the joint during conventional mechanical joining. Furthermore, the friction-induced heat of the novel joining process causes a finer microstructure in the hypoeutectic AlSi9 casting alloy. In particular, the eutectic Si is more fine-grained, resulting in higher joint ductility. This study indicates the joining suitability of a hypoeutectic aluminium casting alloy in combination with adaptive manufactured additional joining elements. Here, various mechanical and microstructural investigations validate the influence of the thermomechanical joining technique. In conclusion, the potential of this joining process is presented regarding the joinability of cast aluminium components. </jats:p>","lang":"eng"}],"date_created":"2023-03-16T14:59:01Z","publisher":"Materials Research Forum LLC","title":"Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy","quality_controlled":"1","year":"2023"}]