[{"publisher":"IOP Publishing","_id":"61825","volume":36,"user_id":"93720","status":"public","oa":"1","citation":{"ama":"Butzhammer L, Handke N, Wittl S, Herl G, Hausotte T. Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom. Measurement Science and Technology. 2025;36(2). doi:10.1088/1361-6501/ada05a","bibtex":"@article{Butzhammer_Handke_Wittl_Herl_Hausotte_2025, title={Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom}, volume={36}, DOI={10.1088/1361-6501/ada05a}, number={2025401}, journal={Measurement Science and Technology}, publisher={IOP Publishing}, author={Butzhammer, Lorenz and Handke, Niklas and Wittl, Simon and Herl, Gabriel and Hausotte, Tino}, year={2025} }","mla":"Butzhammer, Lorenz, et al. “Direct Assessment of the Influence of Pose Repeatability on the Accuracy of Dimensional Measurements for Computed Tomography Systems with High Degrees of Freedom.” Measurement Science and Technology, vol. 36, no. 2, 025401, IOP Publishing, 2025, doi:10.1088/1361-6501/ada05a.","short":"L. Butzhammer, N. Handke, S. Wittl, G. Herl, T. Hausotte, Measurement Science and Technology 36 (2025).","chicago":"Butzhammer, Lorenz, Niklas Handke, Simon Wittl, Gabriel Herl, and Tino Hausotte. “Direct Assessment of the Influence of Pose Repeatability on the Accuracy of Dimensional Measurements for Computed Tomography Systems with High Degrees of Freedom.” Measurement Science and Technology 36, no. 2 (2025). https://doi.org/10.1088/1361-6501/ada05a.","apa":"Butzhammer, L., Handke, N., Wittl, S., Herl, G., & Hausotte, T. (2025). Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom. Measurement Science and Technology, 36(2), Article 025401. https://doi.org/10.1088/1361-6501/ada05a","ieee":"L. Butzhammer, N. Handke, S. Wittl, G. Herl, and T. Hausotte, “Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom,” Measurement Science and Technology, vol. 36, no. 2, Art. no. 025401, 2025, doi: 10.1088/1361-6501/ada05a."},"project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"_id":"133","name":"TRR 285 - Project Area C"},{"name":"TRR 285 - Subproject C05","_id":"149"}],"quality_controlled":"1","language":[{"iso":"eng"}],"article_number":"025401","main_file_link":[{"open_access":"1","url":"https://iopscience.iop.org/article/10.1088/1361-6501/ada05a/pdf"}],"doi":"10.1088/1361-6501/ada05a","author":[{"full_name":"Butzhammer, Lorenz","first_name":"Lorenz","last_name":"Butzhammer"},{"full_name":"Handke, Niklas","last_name":"Handke","first_name":"Niklas"},{"full_name":"Wittl, Simon","last_name":"Wittl","first_name":"Simon"},{"last_name":"Herl","first_name":"Gabriel","full_name":"Herl, Gabriel"},{"first_name":"Tino","last_name":"Hausotte","full_name":"Hausotte, Tino"}],"publication_identifier":{"issn":["0957-0233","1361-6501"]},"title":"Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom","year":"2025","intvolume":" 36","publication_status":"published","date_updated":"2026-02-12T10:45:36Z","date_created":"2025-10-14T13:50:32Z","department":[{"_id":"630"}],"type":"journal_article","issue":"2","publication":"Measurement Science and Technology","abstract":[{"lang":"eng","text":"Abstract\r\n Industrial x-ray computed tomography (CT) systems with high geometric flexibility are increasingly utilized for large-scale measurement objects or challenging measurement tasks. To maintain high accuracy when deviating from the established circular scan trajectory, trajectory calibration methods using multi-sphere reference objects with known marker positions are commonly employed. These multi-sphere objects can either be scanned together with the measurement object (online trajectory calibration) or in a separate scan (offline trajectory calibration). While offline calibration increases machine time, it generally results in higher scan quality. However, a sufficient pose repeatability is necessary to ensure comparable or even superior accuracy to online calibration. In this contribution, we present a straightforward procedure to compare both types of trajectory calibration in a way that the differences of the results can directly be traced back to the influence of the pose repeatability. The multi-sphere reference object is not only used for trajectory calibration, but simultaneously as a measurement object for repeated measurements. The methodology is tested on both a twin robotic CT system and a conventional CT system that is additionally equipped with a hexapod manipulator for adaptive object tilting. Results showed, independent from the type of trajectory calibration, systematic measurement errors in the order of 10−5–10−4 of measured sphere distances and sphericity values below 50 \r\n \r\n \r\n \r\n \r\n μ\r\n \r\n \r\n m\r\n \r\n \r\n \r\n . For sphere distances, random errors were increased by a factor of 5 due to the offline trajectory calibration, but were still low (\r\n \r\n \r\n \r\n \r\n <\r\n \r\n \r\n 1\r\n \r\n \r\n \r\n μ\r\n \r\n \r\n m\r\n \r\n \r\n \r\n ) in comparison to systematic errors and the spread of different measurement features. Overall, both investigated systems demonstrated sufficient positioning repeatability for offline trajectory calibration. The method is in general also applicable to any other types of manipulator systems used for CT devices. It provides a workflow for the decision which type of trajectory calibration is preferable for a given CT system."}]},{"type":"journal_article","date_created":"2026-02-16T06:56:31Z","project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"_id":"131","name":"TRR 285 - Project Area A"},{"name":"TRR 285 - Subproject A05","_id":"139"}],"publication":"Finite Elements in Analysis and Design","citation":{"ieee":"J. Friedlein, P. Steinmann, and J. Mergheim, “One-way coupled staggered implementation of gradient-enhanced damage models coupled to thermoplasticity,” Finite Elements in Analysis and Design, vol. 253, Art. no. 104471, 2025, doi: 10.1016/j.finel.2025.104471.","apa":"Friedlein, J., Steinmann, P., & Mergheim, J. (2025). One-way coupled staggered implementation of gradient-enhanced damage models coupled to thermoplasticity. Finite Elements in Analysis and Design, 253, Article 104471. https://doi.org/10.1016/j.finel.2025.104471","short":"J. Friedlein, P. Steinmann, J. Mergheim, Finite Elements in Analysis and Design 253 (2025).","chicago":"Friedlein, Johannes, Paul Steinmann, and Julia Mergheim. “One-Way Coupled Staggered Implementation of Gradient-Enhanced Damage Models Coupled to Thermoplasticity.” Finite Elements in Analysis and Design 253 (2025). https://doi.org/10.1016/j.finel.2025.104471.","mla":"Friedlein, Johannes, et al. “One-Way Coupled Staggered Implementation of Gradient-Enhanced Damage Models Coupled to Thermoplasticity.” Finite Elements in Analysis and Design, vol. 253, 104471, Elsevier BV, 2025, doi:10.1016/j.finel.2025.104471.","bibtex":"@article{Friedlein_Steinmann_Mergheim_2025, title={One-way coupled staggered implementation of gradient-enhanced damage models coupled to thermoplasticity}, volume={253}, DOI={10.1016/j.finel.2025.104471}, number={104471}, journal={Finite Elements in Analysis and Design}, publisher={Elsevier BV}, author={Friedlein, Johannes and Steinmann, Paul and Mergheim, Julia}, year={2025} }","ama":"Friedlein J, Steinmann P, Mergheim J. One-way coupled staggered implementation of gradient-enhanced damage models coupled to thermoplasticity. Finite Elements in Analysis and Design. 2025;253. doi:10.1016/j.finel.2025.104471"},"user_id":"84990","doi":"10.1016/j.finel.2025.104471","volume":253,"article_number":"104471","_id":"64157","publisher":"Elsevier BV","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2026-02-16T06:59:05Z","intvolume":" 253","status":"public","year":"2025","title":"One-way coupled staggered implementation of gradient-enhanced damage models coupled to thermoplasticity","author":[{"full_name":"Friedlein, Johannes","last_name":"Friedlein","first_name":"Johannes"},{"last_name":"Steinmann","first_name":"Paul","full_name":"Steinmann, Paul"},{"full_name":"Mergheim, Julia","last_name":"Mergheim","first_name":"Julia"}],"publication_identifier":{"issn":["0168-874X"]}},{"_id":"59872","user_id":"7850","volume":408,"status":"public","conference":{"end_date":"2025-06-05","location":"Lissabon (Portugal)","start_date":"2025-06-02","name":"44th Conference of the International Deep Drawing Research Group (IDDRG 2025)"},"oa":"1","citation":{"mla":"Neuser, Moritz, et al. “Mechanical Joinability of Microstructurally Graded Structural Components Manufactured from Hypoeutectic Aluminium Casting Alloys.” 44th Conference of the International Deep Drawing Research Group (IDDRG 2025), vol. 408, 01081, 2025, doi:10.1051/matecconf/202540801081.","apa":"Neuser, M., Schlichter, M. C., Hoyer, K.-P., Bobbert, M., Meschut, G., & Schaper, M. (2025). Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys. 44th Conference of the International Deep Drawing Research Group (IDDRG 2025), 408, Article 01081. https://doi.org/10.1051/matecconf/202540801081","ieee":"M. Neuser, M. C. Schlichter, K.-P. Hoyer, M. Bobbert, G. Meschut, and M. Schaper, “Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys,” 44th Conference of the International Deep Drawing Research Group (IDDRG 2025), vol. 408, Art. no. 01081, 2025, doi: 10.1051/matecconf/202540801081.","ama":"Neuser M, Schlichter MC, Hoyer K-P, Bobbert M, Meschut G, Schaper M. Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys. 44th Conference of the International Deep Drawing Research Group (IDDRG 2025). 2025;408. doi:10.1051/matecconf/202540801081","short":"M. Neuser, M.C. Schlichter, K.-P. Hoyer, M. Bobbert, G. Meschut, M. Schaper, 44th Conference of the International Deep Drawing Research Group (IDDRG 2025) 408 (2025).","chicago":"Neuser, Moritz, Malte Christian Schlichter, Kay-Peter Hoyer, Mathias Bobbert, Gerson Meschut, and Mirko Schaper. “Mechanical Joinability of Microstructurally Graded Structural Components Manufactured from Hypoeutectic Aluminium Casting Alloys.” 44th Conference of the International Deep Drawing Research Group (IDDRG 2025) 408 (2025). https://doi.org/10.1051/matecconf/202540801081.","bibtex":"@article{Neuser_Schlichter_Hoyer_Bobbert_Meschut_Schaper_2025, title={Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys}, volume={408}, DOI={10.1051/matecconf/202540801081}, number={01081}, journal={44th Conference of the International Deep Drawing Research Group (IDDRG 2025)}, author={Neuser, Moritz and Schlichter, Malte Christian and Hoyer, Kay-Peter and Bobbert, Mathias and Meschut, Gerson and Schaper, Mirko}, year={2025} }"},"quality_controlled":"1","project":[{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A02: TRR 285 - Subproject A02","_id":"136"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"main_file_link":[{"url":"\thttps://doi.org/10.1051/matecconf/202540801081","open_access":"1"}],"article_number":"01081","language":[{"iso":"eng"}],"doi":"10.1051/matecconf/202540801081","title":"Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys","year":"2025","author":[{"last_name":"Neuser","first_name":"Moritz","full_name":"Neuser, Moritz","id":"32340"},{"id":"61977","full_name":"Schlichter, Malte Christian","first_name":"Malte Christian","last_name":"Schlichter"},{"first_name":"Kay-Peter","last_name":"Hoyer","full_name":"Hoyer, Kay-Peter","id":"48411"},{"id":"7850","last_name":"Bobbert","first_name":"Mathias","full_name":"Bobbert, Mathias"},{"full_name":"Meschut, Gerson","first_name":"Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","id":"32056"},{"id":"43720","last_name":"Schaper","first_name":"Mirko","full_name":"Schaper, Mirko"}],"date_updated":"2026-02-24T13:41:58Z","publication_status":"published","intvolume":" 408","article_type":"original","date_created":"2025-05-12T15:21:06Z","keyword":["Joining","Casting","Self-pierce riveting","Aluminium casting alloy"],"type":"journal_article","department":[{"_id":"43"},{"_id":"158"},{"_id":"157"},{"_id":"9"},{"_id":"321"}],"publication":"44th Conference of the International Deep Drawing Research Group (IDDRG 2025)","abstract":[{"lang":"eng","text":"Lightweight design is a driving concept in modern automotive engineering to minimize resource consumption over a vehicle's lifecycle through multi-material design, which relies on the use of joining techniques in car body fabrication. Multi-material design and the increasing trend towards producing large structural components using the megacasting process pose considerable challenges, particularly in the mechanical joining of aluminium-silicon (AlSi) castings. These castings typically exhibit low ductility and are prone to cracking when mechanically joined. Based on the excellent castability of hypoeutectic AlSi alloys, these are applied in sand casting and die casting as well as in megacasting. With a silicon content between 7 wt% and 12 wt%, these AlSi-alloys have a plate-like silicon phase that initiates cracks during mechanical joining. To enhance the joinability of castings, the research hypothesis is that improved solidification conditions enable a significant modification in the microstructure and therefore, increase the mechanical properties. During the manufacture of the castings using the sand casting process, the solidification conditions within the structural elements are varied to modify the microstructure to obtain castings with graded microstructure. The castings are evaluated using mechanical, microstructural and joining testing methods and finally, a microstructure-joinability correlation is established."}]},{"date_created":"2025-08-22T10:20:15Z","department":[{"_id":"157"}],"type":"conference","publication":"Materials Research Proceedings","abstract":[{"lang":"eng","text":"In the development of advanced lightweight automotive solutions, self-piercing riveting (SPR) offers the possibility of joining multi-material structures to fulfil a wide variety of requirements. With regard to the entire process chain, production-related pre-deformations of the parts to be joined can influence the geometric shape and load capacity of SPR joints. Various studies have investigated the influence of pre-stretched sheet materials, in the sense of pre-drawing processes, on the formation of SPR joints. The impact of pre-stretching sheet metals on the formation of their geometrical characteristics and the shear-tensile strength of SPR processes was observed [1]. Pre-rolled semi-finished products are also joined together in mixed material automotive structures, e.g. tailor rolled blanks. This work aims to investigate the influence of pre-rolled joining parts on the geometric formation and load-carrying capacity of SPR joints. For this purpose, sheets of metal are cold-formed using a rolling process to induce a defined strain-hardening state in the material and then joined in various combinations. As the degree of deformation increases, the rolling of samples can lead to minimal accumulation of damage in the sheet materials, which can influence the joint behaviour. The rolling process, as well as the subsequent joining process, are also investigated by FEM. The influence of pre-rolled semi-finished products on the strength of the SPR joints is investigated."}],"language":[{"iso":"eng"}],"doi":"10.21741/9781644903599-148","author":[{"id":"61977","full_name":"Schlichter, Malte Christian","first_name":"Malte Christian","last_name":"Schlichter"},{"full_name":"Harabati, Özcan","first_name":"Özcan","last_name":"Harabati","id":"54972"},{"id":"76631","last_name":"Ludwig","first_name":"Jean-Patrick","full_name":"Ludwig, Jean-Patrick"},{"full_name":"Böhnke, Max","last_name":"Böhnke","first_name":"Max","id":"45779"},{"id":"34782","full_name":"Bielak, Christian Roman","last_name":"Bielak","first_name":"Christian Roman"},{"id":"7850","full_name":"Bobbert, Mathias","last_name":"Bobbert","first_name":"Mathias"},{"id":"32056","full_name":"Meschut, Gerson","last_name":"Meschut","orcid":"0000-0002-2763-1246","first_name":"Gerson"}],"publication_identifier":{"issn":["2474-395X"]},"year":"2025","title":"Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints","intvolume":" 54","date_updated":"2026-02-24T14:02:01Z","publication_status":"published","citation":{"mla":"Schlichter, Malte Christian, et al. “Experimental and Numerical Investigation of the Influence of Rolling-Induced Sheet Metal Deformation on SPR Joints.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-148.","ama":"Schlichter MC, Harabati Ö, Ludwig J-P, et al. Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-148","bibtex":"@inproceedings{Schlichter_Harabati_Ludwig_Böhnke_Bielak_Bobbert_Meschut_2025, title={Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints}, volume={54}, DOI={10.21741/9781644903599-148}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Schlichter, Malte Christian and Harabati, Özcan and Ludwig, Jean-Patrick and Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}, year={2025} }","apa":"Schlichter, M. C., Harabati, Ö., Ludwig, J.-P., Böhnke, M., Bielak, C. R., Bobbert, M., & Meschut, G. (2025). Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-148","ieee":"M. C. Schlichter et al., “Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-148.","short":"M.C. Schlichter, Ö. Harabati, J.-P. Ludwig, M. Böhnke, C.R. Bielak, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","chicago":"Schlichter, Malte Christian, Özcan Harabati, Jean-Patrick Ludwig, Max Böhnke, Christian Roman Bielak, Mathias Bobbert, and Gerson Meschut. “Experimental and Numerical Investigation of the Influence of Rolling-Induced Sheet Metal Deformation on SPR Joints.” In Materials Research Proceedings, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-148."},"project":[{"name":"TRR 285 - Subproject A01","_id":"135"},{"name":"TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"quality_controlled":"1","publisher":"Materials Research Forum LLC","_id":"60977","volume":54,"user_id":"7850","status":"public"},{"volume":52,"user_id":"7850","publisher":"Materials Research Forum LLC","_id":"60978","status":"public","project":[{"name":"TRR 285 - Project Area A","_id":"131"},{"_id":"135","name":"TRR 285 - Subproject A01"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"quality_controlled":"1","citation":{"chicago":"Schlichter, Malte Christian, Özcan Harabati, Max Böhnke, Christian Roman Bielak, Mathias Bobbert, and Gerson Meschut. “Investigation on Manufacturing-Induced Pre-Deformation on the Fatigue Behaviour of Clinched Joints.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-16.","short":"M.C. Schlichter, Ö. Harabati, M. Böhnke, C.R. Bielak, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","ieee":"M. C. Schlichter, Ö. Harabati, M. Böhnke, C. R. Bielak, M. Bobbert, and G. Meschut, “Investigation on manufacturing-induced pre-deformation on the fatigue behaviour of clinched joints,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-16.","apa":"Schlichter, M. C., Harabati, Ö., Böhnke, M., Bielak, C. R., Bobbert, M., & Meschut, G. (2025). Investigation on manufacturing-induced pre-deformation on the fatigue behaviour of clinched joints. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-16","bibtex":"@inproceedings{Schlichter_Harabati_Böhnke_Bielak_Bobbert_Meschut_2025, title={Investigation on manufacturing-induced pre-deformation on the fatigue behaviour of clinched joints}, volume={52}, DOI={10.21741/9781644903551-16}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Schlichter, Malte Christian and Harabati, Özcan and Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}, year={2025} }","ama":"Schlichter MC, Harabati Ö, Böhnke M, Bielak CR, Bobbert M, Meschut G. Investigation on manufacturing-induced pre-deformation on the fatigue behaviour of clinched joints. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-16","mla":"Schlichter, Malte Christian, et al. “Investigation on Manufacturing-Induced Pre-Deformation on the Fatigue Behaviour of Clinched Joints.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-16."},"doi":"10.21741/9781644903551-16","language":[{"iso":"eng"}],"intvolume":" 52","publication_status":"published","date_updated":"2026-02-24T14:02:35Z","author":[{"id":"61977","first_name":"Malte Christian","last_name":"Schlichter","full_name":"Schlichter, Malte Christian"},{"id":"54972","full_name":"Harabati, Özcan","first_name":"Özcan","last_name":"Harabati"},{"id":"45779","first_name":"Max","last_name":"Böhnke","full_name":"Böhnke, Max"},{"full_name":"Bielak, Christian Roman","first_name":"Christian Roman","last_name":"Bielak","id":"34782"},{"full_name":"Bobbert, Mathias","last_name":"Bobbert","first_name":"Mathias","id":"7850"},{"full_name":"Meschut, Gerson","first_name":"Gerson","last_name":"Meschut"}],"publication_identifier":{"issn":["2474-395X"]},"year":"2025","title":"Investigation on manufacturing-induced pre-deformation on the fatigue behaviour of clinched joints","department":[{"_id":"157"}],"type":"conference","date_created":"2025-08-22T10:45:56Z","abstract":[{"text":"The present study is an experimental analysis of the influence of pre-forming on the failure behaviour of clinched specimens under quasi-static and cyclic loading conditions. In this context, the geometric formation of the clinched joints is taken into account, with regard to the loading behaviour. The study also includes a comparison of the failure behaviour of quasi-static and cyclic tested specimen. Testing is done on non-pre-deformed and pre-deformed specimens. For this purpose, experimental investigations are carried out on two material combinations consisting of HCT590X steel sheet and EN AW-6014 T4 aluminium sheet. The focus is on the fatigue analysis of the clinched joints. The aim is to identify the failure modes under cyclic loading and the crack formation with regard to forming operations prior to the joining process. The investigations show that the cyclic load-bearing behaviour of the HCT590X joints is reduced by introducing a plastic pre-deformation of the to be joined parts.","lang":"eng"}],"publication":"Materials Research Proceedings"},{"publication_identifier":{"issn":["2474-395X"]},"author":[{"first_name":"Chin","last_name":"Chen","full_name":"Chen, Chin"},{"first_name":"Malte Christian","last_name":"Schlichter","full_name":"Schlichter, Malte Christian","id":"61977"},{"first_name":"Sven","last_name":"Harzheim","full_name":"Harzheim, Sven"},{"first_name":"Martin","last_name":"Hofmann","full_name":"Hofmann, Martin"},{"full_name":"Bobbert, Mathias","first_name":"Mathias","last_name":"Bobbert","id":"7850"},{"full_name":"Meschut, Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","first_name":"Gerson","id":"32056"},{"full_name":"Wallmersperger, Thomas","first_name":"Thomas","last_name":"Wallmersperger"}],"year":"2025","title":"High-cycle fatigue testing and parameter identification for numerical simulation of aluminum alloy EN AW-6014","intvolume":" 52","publication_status":"published","date_updated":"2026-02-24T13:43:56Z","language":[{"iso":"eng"}],"doi":"10.21741/9781644903551-23","publication":"Materials Research Proceedings","abstract":[{"text":"Abstract. As a widely used sheet metal in clinched joints within the automotive industry, the aluminum alloy EN AW-6014 has been the focus of numerous studies. High-cycle fatigue (HCF) is a critical aspect when assessing the durability of clinched joints. In the present work, the HCF behavior of EN AW-6014 T4 was explored both experimentally and numerically. To model the fatigue behavior, Lemaitre’s two-scale damage model was used. Two key parameters, damage strength and damage exponent, are necessary for numerical investigations of HCF behavior. These parameters were determined through experiments with flat specimens and subsequently validated within a numerical model of clinched joints. The numerical results for fatigue match the experimental ones of the clinched joints quite well.","lang":"eng"}],"date_created":"2025-04-15T11:14:53Z","department":[{"_id":"157"}],"type":"conference","status":"public","publisher":"Materials Research Forum LLC","_id":"59587","volume":52,"user_id":"7850","citation":{"bibtex":"@inproceedings{Chen_Schlichter_Harzheim_Hofmann_Bobbert_Meschut_Wallmersperger_2025, title={High-cycle fatigue testing and parameter identification for numerical simulation of aluminum alloy EN AW-6014}, volume={52}, DOI={10.21741/9781644903551-23}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Chen, Chin and Schlichter, Malte Christian and Harzheim, Sven and Hofmann, Martin and Bobbert, Mathias and Meschut, Gerson and Wallmersperger, Thomas}, year={2025} }","ama":"Chen C, Schlichter MC, Harzheim S, et al. High-cycle fatigue testing and parameter identification for numerical simulation of aluminum alloy EN AW-6014. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-23","short":"C. Chen, M.C. Schlichter, S. Harzheim, M. Hofmann, M. Bobbert, G. Meschut, T. Wallmersperger, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","chicago":"Chen, Chin, Malte Christian Schlichter, Sven Harzheim, Martin Hofmann, Mathias Bobbert, Gerson Meschut, and Thomas Wallmersperger. “High-Cycle Fatigue Testing and Parameter Identification for Numerical Simulation of Aluminum Alloy EN AW-6014.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-23.","ieee":"C. Chen et al., “High-cycle fatigue testing and parameter identification for numerical simulation of aluminum alloy EN AW-6014,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-23.","mla":"Chen, Chin, et al. “High-Cycle Fatigue Testing and Parameter Identification for Numerical Simulation of Aluminum Alloy EN AW-6014.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-23.","apa":"Chen, C., Schlichter, M. C., Harzheim, S., Hofmann, M., Bobbert, M., Meschut, G., & Wallmersperger, T. (2025). High-cycle fatigue testing and parameter identification for numerical simulation of aluminum alloy EN AW-6014. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-23"},"project":[{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"quality_controlled":"1"},{"project":[{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"quality_controlled":"1","citation":{"apa":"Harabati, Ö., Bielak, C. R., Böhnke, M., Schlichter, M. C., Brockmeier, M., Bobbert, M., & Meschut, G. (2025). Cross-process damage modeling: A process-chain case study of clinching and self-pierced riveting for aluminum connections. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-19","ieee":"Ö. Harabati et al., “Cross-process damage modeling: A process-chain case study of clinching and self-pierced riveting for aluminum connections,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-19.","chicago":"Harabati, Özcan, Christian Roman Bielak, Max Böhnke, Malte Christian Schlichter, Marc Brockmeier, Mathias Bobbert, and Gerson Meschut. “Cross-Process Damage Modeling: A Process-Chain Case Study of Clinching and Self-Pierced Riveting for Aluminum Connections.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-19.","short":"Ö. Harabati, C.R. Bielak, M. Böhnke, M.C. Schlichter, M. Brockmeier, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","mla":"Harabati, Özcan, et al. “Cross-Process Damage Modeling: A Process-Chain Case Study of Clinching and Self-Pierced Riveting for Aluminum Connections.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-19.","ama":"Harabati Ö, Bielak CR, Böhnke M, et al. Cross-process damage modeling: A process-chain case study of clinching and self-pierced riveting for aluminum connections. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-19","bibtex":"@inproceedings{Harabati_Bielak_Böhnke_Schlichter_Brockmeier_Bobbert_Meschut_2025, title={Cross-process damage modeling: A process-chain case study of clinching and self-pierced riveting for aluminum connections}, volume={52}, DOI={10.21741/9781644903551-19}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Harabati, Özcan and Bielak, Christian Roman and Böhnke, Max and Schlichter, Malte Christian and Brockmeier, Marc and Bobbert, Mathias and Meschut, Gerson}, year={2025} }"},"volume":52,"user_id":"7850","_id":"60002","publisher":"Materials Research Forum LLC","status":"public","type":"conference","date_created":"2025-05-20T12:50:34Z","abstract":[{"text":"This study focuses on damage modeling across different mechanical joining processes within a process chain, specifically using clinching and self-pierce riveting (SPR). The aim is to apply a comprehensive model that captures the damage mechanisms and interactions in these technologies, optimizing them for enhanced performance and durability of aluminum joints. A GISSMO damage model was utilized, based on the stress states occurring during the joining process and a newly introduced damage testing method. This model was applied to both clinching and SPR processes. A detailed analysis of the stress states provided insights into their effect on the material. By incorporating these insights into the GISSMO model, improved accuracy in damage prediction was achieved. The model's application to clinching and SPR demonstrated its effectiveness in optimizing aluminum joint performance and durability, ensuring that the processes can be finely tuned to minimize damage and enhance joint quality.","lang":"eng"}],"publication":"Materials Research Proceedings","doi":"10.21741/9781644903551-19","language":[{"iso":"eng"}],"intvolume":" 52","publication_status":"published","date_updated":"2026-02-24T13:59:43Z","publication_identifier":{"issn":["2474-395X"]},"author":[{"first_name":"Özcan","last_name":"Harabati","full_name":"Harabati, Özcan","id":"54972"},{"last_name":"Bielak","first_name":"Christian Roman","full_name":"Bielak, Christian Roman","id":"34782"},{"id":"45779","first_name":"Max","last_name":"Böhnke","full_name":"Böhnke, Max"},{"first_name":"Malte Christian","last_name":"Schlichter","full_name":"Schlichter, Malte Christian","id":"61977"},{"full_name":"Brockmeier, Marc","last_name":"Brockmeier","first_name":"Marc"},{"id":"7850","first_name":"Mathias","last_name":"Bobbert","full_name":"Bobbert, Mathias"},{"last_name":"Meschut","first_name":"Gerson","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson","id":"32056"}],"year":"2025","title":"Cross-process damage modeling: A process-chain case study of clinching and self-pierced riveting for aluminum connections"},{"publication":"Journal of Advanced Joining Processes","date_created":"2025-04-15T11:00:56Z","type":"journal_article","author":[{"last_name":"Friedlein","first_name":"Johannes","full_name":"Friedlein, Johannes"},{"last_name":"Lüder","first_name":"Stephan","full_name":"Lüder, Stephan"},{"last_name":"Kalich","first_name":"Jan","full_name":"Kalich, Jan"},{"first_name":"Hans Christian","last_name":"Schmale","full_name":"Schmale, Hans Christian"},{"id":"45779","last_name":"Böhnke","first_name":"Max","full_name":"Böhnke, Max"},{"full_name":"Schlichter, Malte Christian","first_name":"Malte Christian","last_name":"Schlichter","id":"61977"},{"id":"7850","last_name":"Bobbert","first_name":"Mathias","full_name":"Bobbert, Mathias"},{"last_name":"Meschut","first_name":"Gerson","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson","id":"32056"},{"first_name":"Paul","last_name":"Steinmann","full_name":"Steinmann, Paul"},{"last_name":"Mergheim","first_name":"Julia","full_name":"Mergheim, Julia"}],"publication_identifier":{"issn":["2666-3309"]},"title":"Application of stress-state-dependent ductile damage and failure model to clinch joining for a wide range of tool and material combinations","year":"2025","intvolume":" 11","publication_status":"published","date_updated":"2026-02-24T14:00:55Z","language":[{"iso":"eng"}],"article_number":"100299","doi":"10.1016/j.jajp.2025.100299","citation":{"ieee":"J. Friedlein et al., “Application of stress-state-dependent ductile damage and failure model to clinch joining for a wide range of tool and material combinations,” Journal of Advanced Joining Processes, vol. 11, Art. no. 100299, 2025, doi: 10.1016/j.jajp.2025.100299.","mla":"Friedlein, Johannes, et al. “Application of Stress-State-Dependent Ductile Damage and Failure Model to Clinch Joining for a Wide Range of Tool and Material Combinations.” Journal of Advanced Joining Processes, vol. 11, 100299, Elsevier BV, 2025, doi:10.1016/j.jajp.2025.100299.","apa":"Friedlein, J., Lüder, S., Kalich, J., Schmale, H. C., Böhnke, M., Schlichter, M. C., Bobbert, M., Meschut, G., Steinmann, P., & Mergheim, J. (2025). Application of stress-state-dependent ductile damage and failure model to clinch joining for a wide range of tool and material combinations. Journal of Advanced Joining Processes, 11, Article 100299. https://doi.org/10.1016/j.jajp.2025.100299","bibtex":"@article{Friedlein_Lüder_Kalich_Schmale_Böhnke_Schlichter_Bobbert_Meschut_Steinmann_Mergheim_2025, title={Application of stress-state-dependent ductile damage and failure model to clinch joining for a wide range of tool and material combinations}, volume={11}, DOI={10.1016/j.jajp.2025.100299}, number={100299}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier BV}, author={Friedlein, Johannes and Lüder, Stephan and Kalich, Jan and Schmale, Hans Christian and Böhnke, Max and Schlichter, Malte Christian and Bobbert, Mathias and Meschut, Gerson and Steinmann, Paul and Mergheim, Julia}, year={2025} }","chicago":"Friedlein, Johannes, Stephan Lüder, Jan Kalich, Hans Christian Schmale, Max Böhnke, Malte Christian Schlichter, Mathias Bobbert, Gerson Meschut, Paul Steinmann, and Julia Mergheim. “Application of Stress-State-Dependent Ductile Damage and Failure Model to Clinch Joining for a Wide Range of Tool and Material Combinations.” Journal of Advanced Joining Processes 11 (2025). https://doi.org/10.1016/j.jajp.2025.100299.","short":"J. Friedlein, S. Lüder, J. Kalich, H.C. Schmale, M. Böhnke, M.C. Schlichter, M. Bobbert, G. Meschut, P. Steinmann, J. Mergheim, Journal of Advanced Joining Processes 11 (2025).","ama":"Friedlein J, Lüder S, Kalich J, et al. Application of stress-state-dependent ductile damage and failure model to clinch joining for a wide range of tool and material combinations. Journal of Advanced Joining Processes. 2025;11. doi:10.1016/j.jajp.2025.100299"},"project":[{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"_id":"138","name":"TRR 285 – A04: TRR 285 - Subproject A04"},{"_id":"139","name":"TRR 285 – A05: TRR 285 - Subproject A05"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"quality_controlled":"1","status":"public","_id":"59584","publisher":"Elsevier BV","volume":11,"user_id":"7850"},{"volume":54,"user_id":"7850","publisher":"Materials Research Forum LLC","_id":"60440","status":"public","project":[{"_id":"130","name":"TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"_id":"133","name":"TRR 285 - C: TRR 285 - Project Area C"},{"_id":"146","name":"TRR 285 – C02: TRR 285 - Subproject C02"},{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"}],"quality_controlled":"1","citation":{"mla":"Holtkamp, Pia Katharina, et al. “Simulation of the Joining Process of Graded Hardened Multi-Range Capable Rivets.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-153.","ama":"Holtkamp PK, Bielak CR, Bobbert M, Meschut G. Simulation of the joining process of graded hardened multi-range capable rivets. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-153","bibtex":"@inproceedings{Holtkamp_Bielak_Bobbert_Meschut_2025, title={Simulation of the joining process of graded hardened multi-range capable rivets}, volume={54}, DOI={10.21741/9781644903599-153}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Holtkamp, Pia Katharina and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}, year={2025} }","apa":"Holtkamp, P. K., Bielak, C. R., Bobbert, M., & Meschut, G. (2025). Simulation of the joining process of graded hardened multi-range capable rivets. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-153","ieee":"P. K. Holtkamp, C. R. Bielak, M. Bobbert, and G. Meschut, “Simulation of the joining process of graded hardened multi-range capable rivets,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-153.","short":"P.K. Holtkamp, C.R. Bielak, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","chicago":"Holtkamp, Pia Katharina, Christian Roman Bielak, Mathias Bobbert, and Gerson Meschut. “Simulation of the Joining Process of Graded Hardened Multi-Range Capable Rivets.” In Materials Research Proceedings, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-153."},"doi":"10.21741/9781644903599-153","language":[{"iso":"eng"}],"intvolume":" 54","date_updated":"2026-02-24T14:12:10Z","publication_status":"published","publication_identifier":{"issn":["2474-395X"]},"author":[{"last_name":"Holtkamp","first_name":"Pia Katharina","full_name":"Holtkamp, Pia Katharina","id":"44935"},{"full_name":"Bielak, Christian Roman","first_name":"Christian Roman","last_name":"Bielak","id":"34782"},{"full_name":"Bobbert, Mathias","first_name":"Mathias","last_name":"Bobbert","id":"7850"},{"id":"32056","full_name":"Meschut, Gerson","last_name":"Meschut","first_name":"Gerson","orcid":"0000-0002-2763-1246"}],"year":"2025","title":"Simulation of the joining process of graded hardened multi-range capable rivets","department":[{"_id":"43"},{"_id":"157"}],"type":"conference","date_created":"2025-06-27T08:23:00Z","abstract":[{"text":"The versatile self-pierce riveting (V-SPR) is a further development of semi-tubular self-pierce riveting. V-SPR enables adaptation to changing boundary conditions, such as a change in the material thickness combination, without varying the rivet die combination due to increased punch actuation and the use of multi-range capable rivets [1]. The inner punch first sets the rivet. The outer punch then forms the rivet head to the respective sheet thickness. For this, the rivet requires a hard shank and a ductile rivet head, which is achieved by an inductive local hardening process [2]. Until now, the joint formation of rivets with graded hardness profile has been challenging to estimate in the FEM simulation due to the inhomogeneous material conditions in the rivet. In this study, a method capable of reproducing the experimentally determined hardness levels of rivets in detail is shown. This FE model enables the realistic modelling of the mechanical properties of the rivet on the basis of the hardness profile in order to predict the correct deformation processes and stresses during the riveting process. First, the detailed experimental hardness mapping of the locally heat-treated rivets is transferred into the FE model. The FEM material model can predict the local strength of the rivet based on hardness by scaling the flow curves. To estimate the predictive capability of the FEM model, the joint formation of rivets with different graded hardness profiles is compared experimentally and simulative. Based on the validated model, the influence of different rivet hardness profiles on the joint formation is analysed numerically. By adapting the material model, a high level of correlation between the experiment's joint formation and the simulation can be achieved.","lang":"eng"}],"publication":"Materials Research Proceedings"},{"author":[{"full_name":"Dargel, Alrik","last_name":"Dargel","first_name":"Alrik","id":"114764"},{"first_name":"Daniel","last_name":"Köhler","full_name":"Köhler, Daniel","id":"83408"},{"last_name":"Gude","first_name":"Maik","full_name":"Gude, Maik"},{"full_name":"Kupfer, Robert","last_name":"Kupfer","first_name":"Robert"}],"publication_identifier":{"isbn":["978-3-88355-454-9"]},"title":"In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse","year":"2025","intvolume":" 43","publication_status":"published","date_updated":"2026-02-24T15:12:59Z","language":[{"iso":"ger"}],"publication":"Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025","abstract":[{"lang":"ger","text":"Für das Verständnis und die Weiterentwicklung temperaturgestützter mechanischer Fü-geprozesse mit thermoplastischen Faser-Kunststoff-Verbunden (FKV) ist die zerstörungsfreie Analyse der Materialstruktur im Inneren des Fügepunktes während der Entstehung und Belastung erforderlich. Die Kombination aus Prüfung unter Temperatureinfluss und in situ Computertomographie (CT) eröffnet neue Möglichkeiten für die Fügeprozessanalyse. Dazu wurde dazu eine Thermokammer entwickelt und in eine bestehende in situ CT-Anlage integriert. Anwendungsszenarien sind die Herstellung und Prüfung von Fügepunkten unter Temperatur. Die Erwärmung erfolgt über einzeln regelbare Heizzonen, welche eine gezielte Temperaturführung über die gesamte Probengeometrie ermöglichen. Die Temperaturkurve eines Aufheizversuchs, sowie eine Röntgenprojektion einer Probe innerhalb der Thermokammer validie-ren die Konstruktion."}],"date_created":"2026-02-20T14:17:33Z","file":[{"file_id":"64564","content_type":"application/pdf","success":1,"relation":"main_file","date_updated":"2026-02-20T14:14:36Z","file_name":"V-31-Dargel_v03.pdf","access_level":"closed","file_size":398450,"date_created":"2026-02-20T14:14:36Z","creator":"adargel"}],"type":"conference","keyword":["in situ CT","Thermokammer","Thermoplastische FKV"],"conference":{"name":"43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025","start_date":"2025-11-27","location":"Dresden","end_date":"2025-11-28"},"status":"public","has_accepted_license":"1","_id":"64562","publisher":"Deutsche Gesellschaft für Materialkunde e.V. (DGM)","page":"165-170","volume":43,"editor":[{"first_name":"Martina","last_name":"Zimmermann","full_name":"Zimmermann, Martina"}],"user_id":"114764","ddc":["620"],"citation":{"mla":"Dargel, Alrik, et al. “In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse.” Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025, edited by Martina Zimmermann, vol. 43, Deutsche Gesellschaft für Materialkunde e.V. (DGM), 2025, pp. 165–70.","bibtex":"@inproceedings{Dargel_Köhler_Gude_Kupfer_2025, place={Sankt Augustin}, title={In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse}, volume={43}, booktitle={Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025}, publisher={Deutsche Gesellschaft für Materialkunde e.V. (DGM)}, author={Dargel, Alrik and Köhler, Daniel and Gude, Maik and Kupfer, Robert}, editor={Zimmermann, Martina}, year={2025}, pages={165–170} }","ama":"Dargel A, Köhler D, Gude M, Kupfer R. In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse. In: Zimmermann M, ed. Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025. Vol 43. Deutsche Gesellschaft für Materialkunde e.V. (DGM); 2025:165-170.","ieee":"A. Dargel, D. Köhler, M. Gude, and R. Kupfer, “In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse,” in Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025, Dresden, 2025, vol. 43, pp. 165–170.","apa":"Dargel, A., Köhler, D., Gude, M., & Kupfer, R. (2025). In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse. In M. Zimmermann (Ed.), Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025 (Vol. 43, pp. 165–170). Deutsche Gesellschaft für Materialkunde e.V. (DGM).","short":"A. Dargel, D. Köhler, M. Gude, R. Kupfer, in: M. Zimmermann (Ed.), Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025, Deutsche Gesellschaft für Materialkunde e.V. (DGM), Sankt Augustin, 2025, pp. 165–170.","chicago":"Dargel, Alrik, Daniel Köhler, Maik Gude, and Robert Kupfer. “In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse.” In Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025, edited by Martina Zimmermann, 43:165–70. Sankt Augustin: Deutsche Gesellschaft für Materialkunde e.V. (DGM), 2025."},"file_date_updated":"2026-02-20T14:14:36Z","project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"name":"TRR 285 - Subproject C04","_id":"148"}],"place":"Sankt Augustin"},{"type":"journal_article","date_created":"2025-10-09T08:27:41Z","abstract":[{"text":"Abstract\r\n A clinch point’s quality is usually assessed using ex situ destructive testing methods. These, however, are unable to detect phenomena immediately during the joining process. For instance, elastic deformations reverse and cracks close after unloading. In situ methods such as the force-displacement evaluation are used to investigate a clinching process, though deviations in the clinch point geometry cannot be derived with this method. To overcome these limitations, the clinching process can be investigated using in situ computed tomography (in situ CT). When investigating the clinching of aluminum parts in in situ CT, the sheet-sheet interface is hardly visible. Earlier investigations showed that radiopaque materials can be applied between the joining parts to enhance the detectability of the sheet-sheet interface. However, the layers cause strong artefacts, break during the clinching process or change the clinch joint’s properties significantly. In this paper, a minimally invasive method to enhance the interface detectability is presented. First, the aluminum oxide layer is removed by etching. Second, the specimen is electroplated with copper or gold, respectively. In some cases, a mask is applied to create a cross-shaped plating pattern. Then, the plated specimen is clinched with a non-plated counterpart and the interface detectability of the clinch points is assessed in CT scans. It is shown that a copper plating of 2.6–4 μm can visualize some parts of the interface, while 7–9 μm is suitable to enhance the detectability of the sheet-sheet interface almost continuously.","lang":"eng"}],"issue":"4","publication":"Journal of Nondestructive Evaluation","doi":"10.1007/s10921-025-01270-1","article_number":"131","language":[{"iso":"eng"}],"date_updated":"2026-02-24T15:13:52Z","publication_status":"published","intvolume":" 44","article_type":"original","title":"In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials","year":"2025","publication_identifier":{"issn":["0195-9298","1573-4862"]},"author":[{"first_name":"Daniel","last_name":"Köhler","full_name":"Köhler, Daniel","id":"83408"},{"id":"114764","full_name":"Dargel, Alrik","last_name":"Dargel","first_name":"Alrik"},{"full_name":"Troschitz, Juliane","first_name":"Juliane","last_name":"Troschitz"},{"full_name":"Gude, Maik","first_name":"Maik","last_name":"Gude"},{"full_name":"Kupfer, Robert","first_name":"Robert","last_name":"Kupfer"}],"project":[{"name":"TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"_id":"148","name":"TRR 285 - Subproject C04"}],"citation":{"ama":"Köhler D, Dargel A, Troschitz J, Gude M, Kupfer R. In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials. Journal of Nondestructive Evaluation. 2025;44(4). doi:10.1007/s10921-025-01270-1","bibtex":"@article{Köhler_Dargel_Troschitz_Gude_Kupfer_2025, title={In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials}, volume={44}, DOI={10.1007/s10921-025-01270-1}, number={4131}, journal={Journal of Nondestructive Evaluation}, publisher={Springer Science and Business Media LLC}, author={Köhler, Daniel and Dargel, Alrik and Troschitz, Juliane and Gude, Maik and Kupfer, Robert}, year={2025} }","mla":"Köhler, Daniel, et al. “In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials.” Journal of Nondestructive Evaluation, vol. 44, no. 4, 131, Springer Science and Business Media LLC, 2025, doi:10.1007/s10921-025-01270-1.","short":"D. Köhler, A. Dargel, J. Troschitz, M. Gude, R. Kupfer, Journal of Nondestructive Evaluation 44 (2025).","chicago":"Köhler, Daniel, Alrik Dargel, Juliane Troschitz, Maik Gude, and Robert Kupfer. “In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials.” Journal of Nondestructive Evaluation 44, no. 4 (2025). https://doi.org/10.1007/s10921-025-01270-1.","apa":"Köhler, D., Dargel, A., Troschitz, J., Gude, M., & Kupfer, R. (2025). In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials. Journal of Nondestructive Evaluation, 44(4), Article 131. https://doi.org/10.1007/s10921-025-01270-1","ieee":"D. Köhler, A. Dargel, J. Troschitz, M. Gude, and R. Kupfer, “In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials,” Journal of Nondestructive Evaluation, vol. 44, no. 4, Art. no. 131, 2025, doi: 10.1007/s10921-025-01270-1."},"user_id":"114764","volume":44,"_id":"61767","publisher":"Springer Science and Business Media LLC","status":"public"},{"project":[{"_id":"142","name":"TRR 285 - Subproject B03"},{"name":"TRR 285 - Project Area B","_id":"132"},{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"abstract":[{"lang":"eng","text":"Abstract\r\n The effects of corrosion on clinched joints are not completely understood yet. Recent research indicates that galvanic corrosion can actually enhance the fatigue life of clinched joints. It is then of significant interest to investigate the effects of another corrosion phenomenon, pitting corrosion, on the fatigue behavior of clinched joints. Pitting corrosion occurs in passive metals and can lead to stress concentrations. In the present study, the effects of pitting corrosion are investigated by using Lemaitre’s two-scale fatigue model with a 2D geometry of clinched joints. A slip condition is applied as a boundary condition to simplify the clinched joint model and reduce the computational cost of solving the contact mechanics problem. Additionally, a method to determine the damage strength and the damage exponent used in the two-scale damage model is introduced. Numerical simulations reveal that pitting corrosion reduces the fatigue life of clinched joints, particularly when it occurs on the internal surface in the neck area."}],"citation":{"ieee":"C. Chen, S. Harzheim, M. Hofmann, and T. Wallmersperger, “Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints,” Acta Mechanica, 2025, doi: 10.1007/s00707-025-04234-8.","apa":"Chen, C., Harzheim, S., Hofmann, M., & Wallmersperger, T. (2025). Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints. Acta Mechanica. https://doi.org/10.1007/s00707-025-04234-8","chicago":"Chen, Chin, Sven Harzheim, Martin Hofmann, and Thomas Wallmersperger. “Numerical Investigation of the Effects of Pitting Corrosion on High-Cycle Fatigue of Clinched Joints.” Acta Mechanica, 2025. https://doi.org/10.1007/s00707-025-04234-8.","short":"C. Chen, S. Harzheim, M. Hofmann, T. Wallmersperger, Acta Mechanica (2025).","mla":"Chen, Chin, et al. “Numerical Investigation of the Effects of Pitting Corrosion on High-Cycle Fatigue of Clinched Joints.” Acta Mechanica, Springer Science and Business Media LLC, 2025, doi:10.1007/s00707-025-04234-8.","bibtex":"@article{Chen_Harzheim_Hofmann_Wallmersperger_2025, title={Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints}, DOI={10.1007/s00707-025-04234-8}, journal={Acta Mechanica}, publisher={Springer Science and Business Media LLC}, author={Chen, Chin and Harzheim, Sven and Hofmann, Martin and Wallmersperger, Thomas}, year={2025} }","ama":"Chen C, Harzheim S, Hofmann M, Wallmersperger T. Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints. Acta Mechanica. Published online 2025. doi:10.1007/s00707-025-04234-8"},"publication":"Acta Mechanica","type":"journal_article","date_created":"2025-09-10T07:52:43Z","date_updated":"2026-02-24T15:11:39Z","publication_status":"published","author":[{"first_name":"Chin","last_name":"Chen","full_name":"Chen, Chin","id":"114741"},{"full_name":"Harzheim, Sven","first_name":"Sven","last_name":"Harzheim"},{"last_name":"Hofmann","first_name":"Martin","full_name":"Hofmann, Martin"},{"last_name":"Wallmersperger","first_name":"Thomas","full_name":"Wallmersperger, Thomas"}],"publication_identifier":{"issn":["0001-5970","1619-6937"]},"year":"2025","status":"public","title":"Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints","doi":"10.1007/s00707-025-04234-8","user_id":"114741","_id":"61161","language":[{"iso":"eng"}],"publisher":"Springer Science and Business Media LLC"},{"type":"journal_article","date_created":"2025-09-23T11:58:18Z","abstract":[{"lang":"eng","text":"Abstract\r\n The effect of corrosion on mechanically joined components is not well understood. While recent research shows that a brief exposure of clinched specimens to a salt spray environment improves the specimens’ fatigue life, other research shows a decrease in load bearing capabilities with increasing corrosion times. These studies primarily focus on galvanic corrosion. It is not entirely clear how other corrosion phenomena, such as pitting corrosion, affect the fatigue life of clinched joints. In this work, a numerical model is used, which is able to simulate corrosion pit growth in EN AW-6014. The experimental polarization data of EN AW-6014 are used directly in the calculation of the interface kinetics parameter of the model."}],"project":[{"_id":"132","name":"TRR 285 - Project Area B"},{"_id":"142","name":"TRR 285 - Subproject B03"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"publication":"Acta Mechanica","citation":{"ieee":"S. Harzheim, C. Chen, K. Hollmer, M. Hofmann, M. Zimmermann, and T. Wallmersperger, “Numerical investigation of pitting corrosion in clinched joints,” Acta Mechanica, 2025, doi: 10.1007/s00707-025-04248-2.","apa":"Harzheim, S., Chen, C., Hollmer, K., Hofmann, M., Zimmermann, M., & Wallmersperger, T. (2025). Numerical investigation of pitting corrosion in clinched joints. Acta Mechanica. https://doi.org/10.1007/s00707-025-04248-2","chicago":"Harzheim, Sven, Chin Chen, Katharina Hollmer, Martin Hofmann, Martina Zimmermann, and Thomas Wallmersperger. “Numerical Investigation of Pitting Corrosion in Clinched Joints.” Acta Mechanica, 2025. https://doi.org/10.1007/s00707-025-04248-2.","short":"S. Harzheim, C. Chen, K. Hollmer, M. Hofmann, M. Zimmermann, T. Wallmersperger, Acta Mechanica (2025).","mla":"Harzheim, Sven, et al. “Numerical Investigation of Pitting Corrosion in Clinched Joints.” Acta Mechanica, Springer Science and Business Media LLC, 2025, doi:10.1007/s00707-025-04248-2.","bibtex":"@article{Harzheim_Chen_Hollmer_Hofmann_Zimmermann_Wallmersperger_2025, title={Numerical investigation of pitting corrosion in clinched joints}, DOI={10.1007/s00707-025-04248-2}, journal={Acta Mechanica}, publisher={Springer Science and Business Media LLC}, author={Harzheim, Sven and Chen, Chin and Hollmer, Katharina and Hofmann, Martin and Zimmermann, Martina and Wallmersperger, Thomas}, year={2025} }","ama":"Harzheim S, Chen C, Hollmer K, Hofmann M, Zimmermann M, Wallmersperger T. Numerical investigation of pitting corrosion in clinched joints. Acta Mechanica. Published online 2025. doi:10.1007/s00707-025-04248-2"},"user_id":"114741","doi":"10.1007/s00707-025-04248-2","_id":"61411","language":[{"iso":"eng"}],"publisher":"Springer Science and Business Media LLC","publication_status":"published","date_updated":"2026-02-24T15:12:17Z","year":"2025","title":"Numerical investigation of pitting corrosion in clinched joints","status":"public","author":[{"first_name":"Sven","last_name":"Harzheim","full_name":"Harzheim, Sven"},{"id":"114741","full_name":"Chen, Chin","last_name":"Chen","first_name":"Chin"},{"first_name":"Katharina","last_name":"Hollmer","full_name":"Hollmer, Katharina"},{"full_name":"Hofmann, Martin","first_name":"Martin","last_name":"Hofmann"},{"first_name":"Martina","last_name":"Zimmermann","full_name":"Zimmermann, Martina"},{"last_name":"Wallmersperger","first_name":"Thomas","full_name":"Wallmersperger, Thomas"}],"publication_identifier":{"issn":["0001-5970","1619-6937"]}},{"page":"268–275","_id":"62079","publisher":"Materials Research Forum LLC, Materials Research Foundations","user_id":"105344","editor":[{"first_name":"G.","last_name":"Meschut","full_name":"Meschut, G."},{"first_name":"M.","last_name":"Bobbert","full_name":"Bobbert, M."},{"last_name":"Duflou","first_name":"J.","full_name":"Duflou, J."},{"last_name":"Fratini","first_name":"L.","full_name":"Fratini, L."},{"full_name":"Hagenah, H.","first_name":"H.","last_name":"Hagenah"},{"first_name":"P.","last_name":"Martins","full_name":"Martins, P."},{"last_name":"Merklein","first_name":"M.","full_name":"Merklein, M."},{"last_name":"Micari","first_name":"F.","full_name":"Micari, F."}],"status":"public","citation":{"mla":"Gröger, Benjamin, et al. “Modeling Approaches for the Decomposition Behavior of Preconsolidated Rovings throughout Local Deformation Processes.” Sheet Metal 2025, edited by G. Meschut et al., Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 268–275, doi:10.21741/9781644903551-33.","bibtex":"@inproceedings{Gröger_Gerritzen_Hornig_Gude_2025, series={Materials Research Proceedings}, title={Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes}, DOI={10.21741/9781644903551-33}, booktitle={Sheet Metal 2025}, publisher={Materials Research Forum LLC, Materials Research Foundations}, author={Gröger, Benjamin and Gerritzen, Johannes and Hornig, Andreas and Gude, Maik}, editor={Meschut, G. and Bobbert, M. and Duflou, J. and Fratini, L. and Hagenah, H. and Martins, P. and Merklein, M. and Micari, F.}, year={2025}, pages={268–275}, collection={Materials Research Proceedings} }","ama":"Gröger B, Gerritzen J, Hornig A, Gude M. Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes. In: Meschut G, Bobbert M, Duflou J, et al., eds. Sheet Metal 2025. Materials Research Proceedings. Materials Research Forum LLC, Materials Research Foundations; 2025:268–275. doi:10.21741/9781644903551-33","ieee":"B. Gröger, J. Gerritzen, A. Hornig, and M. Gude, “Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes,” in Sheet Metal 2025, 2025, pp. 268–275, doi: 10.21741/9781644903551-33.","apa":"Gröger, B., Gerritzen, J., Hornig, A., & Gude, M. (2025). Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes. In G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, & F. Micari (Eds.), Sheet Metal 2025 (pp. 268–275). Materials Research Forum LLC, Materials Research Foundations. https://doi.org/10.21741/9781644903551-33","chicago":"Gröger, Benjamin, Johannes Gerritzen, Andreas Hornig, and Maik Gude. “Modeling Approaches for the Decomposition Behavior of Preconsolidated Rovings throughout Local Deformation Processes.” In Sheet Metal 2025, edited by G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, and F. Micari, 268–275. Materials Research Proceedings. Materials Research Forum LLC, Materials Research Foundations, 2025. https://doi.org/10.21741/9781644903551-33.","short":"B. Gröger, J. Gerritzen, A. Hornig, M. Gude, in: G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari (Eds.), Sheet Metal 2025, Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 268–275."},"project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"name":"TRR 285 - Subproject A03","_id":"137"},{"name":"TRR 285 - Project Area A","_id":"131"}],"series_title":"Materials Research Proceedings","language":[{"iso":"eng"}],"doi":"10.21741/9781644903551-33","year":"2025","title":"Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes","publication_identifier":{"isbn":["978-1-64490-354-4"]},"author":[{"first_name":"Benjamin","last_name":"Gröger","full_name":"Gröger, Benjamin"},{"full_name":"Gerritzen, Johannes","last_name":"Gerritzen","orcid":"0000-0002-0169-8602","first_name":"Johannes","id":"105344"},{"full_name":"Hornig, Andreas","last_name":"Hornig","first_name":"Andreas"},{"last_name":"Gude","first_name":"Maik","full_name":"Gude, Maik"}],"date_updated":"2026-02-27T06:43:19Z","date_created":"2025-11-04T12:48:21Z","type":"conference","keyword":["Finite Element Method (FEM)","Process","Thermoplastic Fiber Reinforced Plastic"],"publication":"Sheet Metal 2025","abstract":[{"text":"This paper investigates two modeling approaches for the simulation of the deformation and decomposition behavior of preconsolidated rovings above the thermoplastic matrix{\\textquoteright} melting temperature. This is crucial for capturing the local material structure after processes introducing highly localized deformation such as mechanical joining processes between metal and fiber reinforced thermoplastics (FRTP). A generic finite element (FE) model is developed, incorporating interfaces discretized through either cohesive zone (CZ) elements or Coulomb friction-based contacts. The material parameters for the FE elements are derived from the initial stiffness of a statistical volume element (SVE) at micro scale modelled with an Arbitrary-Lagrange-Eulerian method for three load cases. The CZ properties calculated are based on the shear viscosity of the composite. The CZ and contact modelling approaches are evaluated using three load cases of the SVE, comparing force-displacement curves. Under simple loading conditions, such as normal pressure tension and bending, both methods produce similar results; however, in complex load cases, the CZ approach shows clear advantages in handling interface interactions and shows robust simulations. The CZ approach thus presents a promising method for simulating roving decomposition in FRTP-metal joining applications above the matrix{\\textquoteright} melting temperature.","lang":"eng"}]},{"citation":{"apa":"Gerritzen, J., Hornig, A., & Gude, M. (2025). Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning. In G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, & F. Micari (Eds.), Sheet Metal 2025 (pp. 260–267). Materials Research Forum LLC, Materials Research Foundations. https://doi.org/10.21741/9781644903551-32","ieee":"J. Gerritzen, A. Hornig, and M. Gude, “Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning,” in Sheet Metal 2025, 2025, pp. 260–267, doi: 10.21741/9781644903551-32.","short":"J. Gerritzen, A. Hornig, M. Gude, in: G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari (Eds.), Sheet Metal 2025, Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 260–267.","chicago":"Gerritzen, Johannes, Andreas Hornig, and Maik Gude. “Efficient Failure Information Propagation under Complex Stress States in Fiber Reinforced Polymers: From Micro- to Meso-Scale Using Machine Learning.” In Sheet Metal 2025, edited by G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, and F. Micari, 260–267. Materials Research Proceedings. Materials Research Forum LLC, Materials Research Foundations, 2025. https://doi.org/10.21741/9781644903551-32.","mla":"Gerritzen, Johannes, et al. “Efficient Failure Information Propagation under Complex Stress States in Fiber Reinforced Polymers: From Micro- to Meso-Scale Using Machine Learning.” Sheet Metal 2025, edited by G. Meschut et al., Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 260–267, doi:10.21741/9781644903551-32.","ama":"Gerritzen J, Hornig A, Gude M. Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning. In: Meschut G, Bobbert M, Duflou J, et al., eds. Sheet Metal 2025. Materials Research Proceedings. Materials Research Forum LLC, Materials Research Foundations; 2025:260–267. doi:10.21741/9781644903551-32","bibtex":"@inproceedings{Gerritzen_Hornig_Gude_2025, series={Materials Research Proceedings}, title={Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning}, DOI={10.21741/9781644903551-32}, booktitle={Sheet Metal 2025}, publisher={Materials Research Forum LLC, Materials Research Foundations}, author={Gerritzen, Johannes and Hornig, Andreas and Gude, Maik}, editor={Meschut, G. and Bobbert, M. and Duflou, J. and Fratini, L. and Hagenah, H. and Martins, P. and Merklein, M. and Micari, F.}, year={2025}, pages={260–267}, collection={Materials Research Proceedings} }"},"project":[{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"_id":"137","name":"TRR 285 - Subproject A03"},{"name":"TRR 285 - Project Area A","_id":"131"}],"_id":"62080","publisher":"Materials Research Forum LLC, Materials Research Foundations","page":"260–267","editor":[{"first_name":"G.","last_name":"Meschut","full_name":"Meschut, G."},{"full_name":"Bobbert, M.","first_name":"M.","last_name":"Bobbert"},{"last_name":"Duflou","first_name":"J.","full_name":"Duflou, J."},{"full_name":"Fratini, L.","first_name":"L.","last_name":"Fratini"},{"last_name":"Hagenah","first_name":"H.","full_name":"Hagenah, H."},{"full_name":"Martins, P.","last_name":"Martins","first_name":"P."},{"full_name":"Merklein, M.","first_name":"M.","last_name":"Merklein"},{"full_name":"Micari, F.","first_name":"F.","last_name":"Micari"}],"user_id":"105344","status":"public","date_created":"2025-11-04T12:48:37Z","type":"conference","keyword":["Failure","Fiber Reinforced Plastic","Machine Learning"],"publication":"Sheet Metal 2025","abstract":[{"lang":"eng","text":"The failure behavior of fiber reinforced polymers (FRP) is strongly influenced by their microstructure, i.e. fiber arrangement or local fiber volume content. However, this information cannot be directly used for structural analyses, since it requires a discretization on micrometer level. Therefore, current failure theories do not directly account for such effects, but describe the behavior averaged over an entire specimen. This foundation in experimentally accessible loading conditions leads to purely theory based extension to more complex stress states without direct validation possibilities. This work aims at leveraging micro-scale simulations to obtain failure information under arbitrary loading conditions. The results are propagated to the meso-scale, enabling efficient structural analyses, by means of machine learning (ML). It is shown that the ML model is capable of correctly assessing previously unseen stress states and therefore poses an efficient tool of exploiting information from the micro-scale in larger simulations."}],"series_title":"Materials Research Proceedings","language":[{"iso":"eng"}],"doi":"10.21741/9781644903551-32","publication_identifier":{"isbn":["978-1-64490-354-4"]},"author":[{"id":"105344","full_name":"Gerritzen, Johannes","first_name":"Johannes","last_name":"Gerritzen","orcid":"0000-0002-0169-8602"},{"last_name":"Hornig","first_name":"Andreas","full_name":"Hornig, Andreas"},{"full_name":"Gude, Maik","first_name":"Maik","last_name":"Gude"}],"title":"Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning","year":"2025","date_updated":"2026-02-27T06:43:37Z"},{"date_created":"2025-11-04T12:49:13Z","type":"journal_article","publication":"Materials & Design","citation":{"bibtex":"@article{Gerritzen_Gröger_Zscheyge_Hornig_Gude_2025, title={3D viscoelastic plastic model coupled with a continuum damage formulation for fiber reinforced polymers}, volume={260}, DOI={10.1016/j.matdes.2025.114969}, number={114969}, journal={Materials & Design}, publisher={Elsevier BV}, author={Gerritzen, Johannes and Gröger, Benjamin and Zscheyge, Matthias and Hornig, Andreas and Gude, Maik}, year={2025} }","ama":"Gerritzen J, Gröger B, Zscheyge M, Hornig A, Gude M. 3D viscoelastic plastic model coupled with a continuum damage formulation for fiber reinforced polymers. Materials & Design. 2025;260. doi:10.1016/j.matdes.2025.114969","mla":"Gerritzen, Johannes, et al. “3D Viscoelastic Plastic Model Coupled with a Continuum Damage Formulation for Fiber Reinforced Polymers.” Materials & Design, vol. 260, 114969, Elsevier BV, 2025, doi:10.1016/j.matdes.2025.114969.","chicago":"Gerritzen, Johannes, Benjamin Gröger, Matthias Zscheyge, Andreas Hornig, and Maik Gude. “3D Viscoelastic Plastic Model Coupled with a Continuum Damage Formulation for Fiber Reinforced Polymers.” Materials & Design 260 (2025). https://doi.org/10.1016/j.matdes.2025.114969.","short":"J. Gerritzen, B. Gröger, M. Zscheyge, A. Hornig, M. Gude, Materials & Design 260 (2025).","ieee":"J. Gerritzen, B. Gröger, M. Zscheyge, A. Hornig, and M. Gude, “3D viscoelastic plastic model coupled with a continuum damage formulation for fiber reinforced polymers,” Materials & Design, vol. 260, Art. no. 114969, 2025, doi: 10.1016/j.matdes.2025.114969.","apa":"Gerritzen, J., Gröger, B., Zscheyge, M., Hornig, A., & Gude, M. (2025). 3D viscoelastic plastic model coupled with a continuum damage formulation for fiber reinforced polymers. Materials & Design, 260, Article 114969. https://doi.org/10.1016/j.matdes.2025.114969"},"project":[{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"name":"TRR 285 - Subproject A03","_id":"137"},{"name":"TRR 285 - Project Area A","_id":"131"}],"article_number":"114969","publisher":"Elsevier BV","_id":"62081","language":[{"iso":"eng"}],"user_id":"105344","doi":"10.1016/j.matdes.2025.114969","volume":260,"title":"3D viscoelastic plastic model coupled with a continuum damage formulation for fiber reinforced polymers","status":"public","year":"2025","author":[{"id":"105344","full_name":"Gerritzen, Johannes","orcid":"0000-0002-0169-8602","first_name":"Johannes","last_name":"Gerritzen"},{"full_name":"Gröger, Benjamin","last_name":"Gröger","first_name":"Benjamin"},{"full_name":"Zscheyge, Matthias","last_name":"Zscheyge","first_name":"Matthias"},{"full_name":"Hornig, Andreas","first_name":"Andreas","last_name":"Hornig"},{"last_name":"Gude","first_name":"Maik","full_name":"Gude, Maik"}],"publication_identifier":{"issn":["0264-1275"]},"publication_status":"published","date_updated":"2026-02-27T06:43:55Z","intvolume":" 260"},{"project":[{"_id":"137","name":"TRR 285 - Subproject A03"},{"name":"TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"_id":"133","name":"TRR 285 - Project Area C"},{"name":"TRR 285 - Subproject C04","_id":"148"}],"publication":"Journal of Advanced Joining Processes","citation":{"mla":"Gerritzen, Johannes, et al. “Quality Assurance of Clinched Joints Using Explainable Machine Learning.” Journal of Advanced Joining Processes, vol. 13, 100368, Elsevier BV, 2025, doi:10.1016/j.jajp.2025.100368.","ama":"Gerritzen J, Chopra K, Reschke G, Hornig A, Brosius A, Gude M. Quality assurance of clinched joints using explainable machine learning. Journal of Advanced Joining Processes. 2025;13. doi:10.1016/j.jajp.2025.100368","bibtex":"@article{Gerritzen_Chopra_Reschke_Hornig_Brosius_Gude_2025, title={Quality assurance of clinched joints using explainable machine learning}, volume={13}, DOI={10.1016/j.jajp.2025.100368}, number={100368}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier BV}, author={Gerritzen, Johannes and Chopra, Kunal and Reschke, Gregor and Hornig, Andreas and Brosius, Alexander and Gude, Maik}, year={2025} }","apa":"Gerritzen, J., Chopra, K., Reschke, G., Hornig, A., Brosius, A., & Gude, M. (2025). Quality assurance of clinched joints using explainable machine learning. Journal of Advanced Joining Processes, 13, Article 100368. https://doi.org/10.1016/j.jajp.2025.100368","ieee":"J. Gerritzen, K. Chopra, G. Reschke, A. Hornig, A. Brosius, and M. Gude, “Quality assurance of clinched joints using explainable machine learning,” Journal of Advanced Joining Processes, vol. 13, Art. no. 100368, 2025, doi: 10.1016/j.jajp.2025.100368.","short":"J. Gerritzen, K. Chopra, G. Reschke, A. Hornig, A. Brosius, M. Gude, Journal of Advanced Joining Processes 13 (2025).","chicago":"Gerritzen, Johannes, Kunal Chopra, Gregor Reschke, Andreas Hornig, Alexander Brosius, and Maik Gude. “Quality Assurance of Clinched Joints Using Explainable Machine Learning.” Journal of Advanced Joining Processes 13 (2025). https://doi.org/10.1016/j.jajp.2025.100368."},"type":"journal_article","date_created":"2026-02-02T08:32:04Z","publication_status":"published","date_updated":"2026-02-27T06:45:47Z","intvolume":" 13","year":"2025","status":"public","title":"Quality assurance of clinched joints using explainable machine learning","publication_identifier":{"issn":["2666-3309"]},"author":[{"first_name":"Johannes","last_name":"Gerritzen","orcid":"0000-0002-0169-8602","full_name":"Gerritzen, Johannes","id":"105344"},{"full_name":"Chopra, Kunal","first_name":"Kunal","last_name":"Chopra"},{"id":"98812","full_name":"Reschke, Gregor","first_name":"Gregor","last_name":"Reschke"},{"first_name":"Andreas","last_name":"Hornig","full_name":"Hornig, Andreas"},{"full_name":"Brosius, Alexander","last_name":"Brosius","first_name":"Alexander"},{"last_name":"Gude","first_name":"Maik","full_name":"Gude, Maik"}],"user_id":"105344","doi":"10.1016/j.jajp.2025.100368","volume":13,"article_number":"100368","_id":"63828","publisher":"Elsevier BV","language":[{"iso":"eng"}]},{"citation":{"ieee":"D. R. Devulapally and T. Tröster, “Modelling strategies for non-rotationally symmetric joints,” in Materials Research Proceedings, Paderborn, 2025, vol. 52, doi: 10.21741/9781644903551-21.","apa":"Devulapally, D. R., & Tröster, T. (2025). Modelling strategies for non-rotationally symmetric joints. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-21","mla":"Devulapally, Deekshith Reddy, and Thomas Tröster. “Modelling Strategies for Non-Rotationally Symmetric Joints.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-21.","bibtex":"@inproceedings{Devulapally_Tröster_2025, title={Modelling strategies for non-rotationally symmetric joints}, volume={52}, DOI={10.21741/9781644903551-21}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Devulapally, Deekshith Reddy and Tröster, Thomas}, year={2025} }","chicago":"Devulapally, Deekshith Reddy, and Thomas Tröster. “Modelling Strategies for Non-Rotationally Symmetric Joints.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-21.","ama":"Devulapally DR, Tröster T. Modelling strategies for non-rotationally symmetric joints. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-21","short":"D.R. Devulapally, T. Tröster, in: Materials Research Proceedings, Materials Research Forum LLC, 2025."},"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"}],"status":"public","conference":{"end_date":"2025-04-03","location":"Paderborn","name":"21st International conference on sheet metal ","start_date":"2025-04-01"},"_id":"59441","publisher":"Materials Research Forum LLC","user_id":"76837","volume":52,"publication":"Materials Research Proceedings","abstract":[{"text":"Abstract. Accurate Finite Element Modeling (FEM) of joints is essential in the design of complex mechanical systems such as automotive body-in-white (BIW) structures, as it plays a critical role in evaluating their performance. Although well-established techniques exist for modeling rotationally symmetric joints, there remains a significant gap in effectively modeling non-rotationally symmetric joints. These joints are particularly relevant in the automotive BIW, where they can better accommodate anisotropic loading conditions. In this study, strategies for modeling non-rotationally symmetric joints were explored using finite element simulations in LS-DYNA. The findings demonstrate that discrete beam elements can capture the anisotropic characteristics of such joints. Two models were tested: a single-beam model for stiffness periodicity every 90°, and a three-beam model for stiffness periodicity every 120°. Force responses, stress distribution, and sheet bending behaviors were analyzed, confirming that discrete beam elements can accurately represent direction-dependent stiffness. These results establish a foundation for developing advanced joint modeling strategies in complex mechanical systems.","lang":"eng"}],"date_created":"2025-04-08T14:57:51Z","type":"conference","department":[{"_id":"149"},{"_id":"9"},{"_id":"321"}],"title":"Modelling strategies for non-rotationally symmetric joints","year":"2025","author":[{"last_name":"Devulapally","first_name":"Deekshith Reddy","full_name":"Devulapally, Deekshith Reddy","id":"76837"},{"id":"553","first_name":"Thomas","last_name":"Tröster","full_name":"Tröster, Thomas"}],"publication_identifier":{"issn":["2474-395X"]},"date_updated":"2026-02-27T10:50:10Z","publication_status":"published","intvolume":" 52","language":[{"iso":"eng"}],"doi":"10.21741/9781644903551-21"},{"language":[{"iso":"eng"}],"doi":"10.1016/j.jmapro.2025.09.059","publication_identifier":{"issn":["1526-6125"]},"author":[{"full_name":"Einwag, Jonathan-Markus","last_name":"Einwag","first_name":"Jonathan-Markus"},{"full_name":"Steinfelder, Christian","last_name":"Steinfelder","first_name":"Christian"},{"last_name":"Wartzack","first_name":"Sandro","full_name":"Wartzack, Sandro"},{"last_name":"Brosius","first_name":"Alexander","full_name":"Brosius, Alexander"},{"full_name":"Goetz, Stefan","last_name":"Goetz","first_name":"Stefan"}],"title":"From simulation to metamodel to experiment: Evaluating the prediction accuracy of polynomial regression models for clinch joint properties","year":"2025","intvolume":" 154","date_updated":"2025-11-12T08:35:35Z","publication_status":"published","date_created":"2025-10-06T07:37:24Z","department":[{"_id":"43"},{"_id":"157"}],"type":"journal_article","publication":"Journal of Manufacturing Processes","_id":"61524","publisher":"Elsevier BV","page":"179-191","volume":154,"user_id":"107109","status":"public","citation":{"apa":"Einwag, J.-M., Steinfelder, C., Wartzack, S., Brosius, A., & Goetz, S. (2025). From simulation to metamodel to experiment: Evaluating the prediction accuracy of polynomial regression models for clinch joint properties. Journal of Manufacturing Processes, 154, 179–191. https://doi.org/10.1016/j.jmapro.2025.09.059","mla":"Einwag, Jonathan-Markus, et al. “From Simulation to Metamodel to Experiment: Evaluating the Prediction Accuracy of Polynomial Regression Models for Clinch Joint Properties.” Journal of Manufacturing Processes, vol. 154, Elsevier BV, 2025, pp. 179–91, doi:10.1016/j.jmapro.2025.09.059.","ieee":"J.-M. Einwag, C. Steinfelder, S. Wartzack, A. Brosius, and S. Goetz, “From simulation to metamodel to experiment: Evaluating the prediction accuracy of polynomial regression models for clinch joint properties,” Journal of Manufacturing Processes, vol. 154, pp. 179–191, 2025, doi: 10.1016/j.jmapro.2025.09.059.","ama":"Einwag J-M, Steinfelder C, Wartzack S, Brosius A, Goetz S. From simulation to metamodel to experiment: Evaluating the prediction accuracy of polynomial regression models for clinch joint properties. Journal of Manufacturing Processes. 2025;154:179-191. doi:10.1016/j.jmapro.2025.09.059","short":"J.-M. Einwag, C. Steinfelder, S. Wartzack, A. Brosius, S. Goetz, Journal of Manufacturing Processes 154 (2025) 179–191.","chicago":"Einwag, Jonathan-Markus, Christian Steinfelder, Sandro Wartzack, Alexander Brosius, and Stefan Goetz. “From Simulation to Metamodel to Experiment: Evaluating the Prediction Accuracy of Polynomial Regression Models for Clinch Joint Properties.” Journal of Manufacturing Processes 154 (2025): 179–91. https://doi.org/10.1016/j.jmapro.2025.09.059.","bibtex":"@article{Einwag_Steinfelder_Wartzack_Brosius_Goetz_2025, title={From simulation to metamodel to experiment: Evaluating the prediction accuracy of polynomial regression models for clinch joint properties}, volume={154}, DOI={10.1016/j.jmapro.2025.09.059}, journal={Journal of Manufacturing Processes}, publisher={Elsevier BV}, author={Einwag, Jonathan-Markus and Steinfelder, Christian and Wartzack, Sandro and Brosius, Alexander and Goetz, Stefan}, year={2025}, pages={179–191} }"},"project":[{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"name":"TRR 285 - Project Area B","_id":"132"},{"_id":"140","name":"TRR 285 - Subproject B01"},{"name":"TRR 285 - Subproject B05","_id":"144"}]},{"citation":{"apa":"Neuser, M., Cichon, G., Hoyer, K.-P., & Schaper, M. (2025). Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen. Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, 43, 454–459.","ieee":"M. Neuser, G. Cichon, K.-P. Hoyer, and M. Schaper, “Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen,” in Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, Dresden, 2025, vol. 43, pp. 454–459.","chicago":"Neuser, Moritz, Gerrit Cichon, Kay-Peter Hoyer, and Mirko Schaper. “Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen.” In Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, 43:454–59. Sankt Augustin: Deutsche Gesellschaft für Materialkunde (DGM), 2025.","short":"M. Neuser, G. Cichon, K.-P. Hoyer, M. Schaper, in: Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, Deutsche Gesellschaft für Materialkunde (DGM), Sankt Augustin, 2025, pp. 454–459.","mla":"Neuser, Moritz, et al. “Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen.” Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen, vol. 43, Deutsche Gesellschaft für Materialkunde (DGM), 2025, pp. 454–59.","ama":"Neuser M, Cichon G, Hoyer K-P, Schaper M. Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen. In: Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen. Vol 43. Deutsche Gesellschaft für Materialkunde (DGM); 2025:454-459.","bibtex":"@inproceedings{Neuser_Cichon_Hoyer_Schaper_2025, place={Sankt Augustin}, title={Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen}, volume={43}, booktitle={Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen}, publisher={Deutsche Gesellschaft für Materialkunde (DGM)}, author={Neuser, Moritz and Cichon, Gerrit and Hoyer, Kay-Peter and Schaper, Mirko}, year={2025}, pages={454–459} }"},"project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"_id":"131","name":"TRR 285 - Project Area A"},{"_id":"136","name":"TRR 285 - Subproject A02"}],"quality_controlled":"1","place":"Sankt Augustin","conference":{"name":"Werkstoffprüfung - 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025","start_date":"2025-11-27","location":"Dresden","end_date":"2025-11-28"},"status":"public","_id":"62725","publisher":"Deutsche Gesellschaft für Materialkunde (DGM)","page":"454 - 459","volume":43,"user_id":"32340","publication":"Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen","abstract":[{"text":"Aluminium-Silizium-Legierungen (AlSi) werden insbesondere bei der gießtechnischen\r\nHerstellung von Leichtbaukomponenten für Fahrzeuge verwendet. Dieses Legierungssystem hat hervorragende\r\nGießeigenschaften bei gleichzeitig akzeptablen mechanischen Eigenschaften. Aufgrund des hohen\r\nSilizium-(Si)-Gehaltes, wodurch die Volumenkontraktion im Phasenübergang von flüssig-fest nahezu\r\nunterbunden wird, neigen AlSi-Legierungen dazu, feinere oder gröbere Si-Platten bei unterschiedlichen\r\nErstarrungsgeschwindigkeiten zu bilden. Um die mechanischen Eigenschaften zu verbessern, werden\r\ndem Legierungssystem in der Schmelzphase entweder Natrium (Na) oder Strontium (Sr) zugesetzt. Dies\r\nhat zur Folge, dass sich eine fein lamellare Si-Morphologie bei der Erstarrung ausbildet; dies kann ebenfalls\r\ndurch hohe Erstarrungsgeschwindigkeiten erreicht werden. Ein nachfolgendes Lösungsglühen bewirkt\r\neine Sphäroidisierung der Si-Partikel und dient der Steigerung der Duktilität. Aktuell fehlen fundierte\r\nErkenntnisse zur Ausprägung der Si-Morphologie in Abhängigkeit der Erstarrungsgeschwindigkeit oder\r\ninfolge einer Wärmebehandlung. Vor diesem Hintergrund werden in dieser Studie verschiedene Behandlungsparameter\r\nin Bezug auf das Einformverhalten der Si-Partikel mit einem bildauswertenden Verfahren\r\nevaluiert sowie unter Bezug auf verschiedene chemische Zusammensetzungen miteinander korreliert.","lang":"ger"},{"text":"Aluminium-silicon alloys (AlSi) are used in the casting of lightweight vehicle components. This\r\nalloy system has excellent casting properties accompanied by acceptable mechanical properties. Due to\r\nthe high silicon (Si) content, which almost completely prevents volume contraction during the liquid-solid\r\nphase transition, AlSi alloys tend to form finer or coarser Si plates at different solidification rates. To\r\nimprove the mechanical properties, either sodium (Na) or strontium (Sr) is added to the alloy system in\r\nthe melting phase. This results in the formation of a fine lamellar Si morphology during solidification, which\r\ncan also be achieved by high solidification rates. Subsequent solution annealing causes spheroidisation\r\nof the Si particles and increases ductility. Currently, there is a lack in scientific knowledge regarding the\r\nSi-morphology as a function of solidification rate or as a result of heat treatment. Therefore, this study\r\nevaluates various treatment parameters in relation to the shaping behaviour of Si particles using an image\r\nanalysis method and correlates them with different chemical compositions.","lang":"eng"}],"date_created":"2025-12-01T13:46:42Z","department":[{"_id":"43"},{"_id":"9"},{"_id":"158"},{"_id":"321"}],"keyword":["Bildauswertendes Verfahren","Mikrostrukturanalyse","AlSi-System","Si-Morphologie"],"type":"conference","author":[{"first_name":"Moritz","last_name":"Neuser","full_name":"Neuser, Moritz","id":"32340"},{"last_name":"Cichon","first_name":"Gerrit","full_name":"Cichon, Gerrit"},{"first_name":"Kay-Peter","last_name":"Hoyer","full_name":"Hoyer, Kay-Peter","id":"48411"},{"first_name":"Mirko","last_name":"Schaper","full_name":"Schaper, Mirko","id":"43720"}],"publication_identifier":{"isbn":["978-3-88355-454-9"]},"year":"2025","title":"Bildauswertendes Verfahren zur Evaluierung der Mikrostruktur von AlSi-Systemen","intvolume":" 43","publication_status":"published","date_updated":"2025-12-01T13:46:53Z","language":[{"iso":"ger"}],"alternative_title":["Image analysis method for evaluating the microstructure of AlSi-alloys"]}]