--- _id: '59483' abstract: - lang: eng text: Abstract. The assessment of mechanically joined connections, such as clinched connections, is usually conducted destructively. Applicable non-destructive testing methods like computed tomography are time-consuming and costly, or, like electrical resistance measurement, provide only a limited amount of information. A fast, non-destructive evaluation of the joints condition shall be made possible by using transient dynamic analysis (TDA). It is based on the introduction of sound waves and the evaluation of the response behavior after passing through the structure. This study focuses the application of TDA to clinched shear connections to evaluate the performance of the tactile measuring setup. Twenty-one series were investigated, covering variations in joining task, manufacturing and defect. The evaluation was carried out using machine learning to determine for which series characteristic signals may be detected. It was shown that a classification of the investigated specimens is possible, whereby the classification accuracy depends on the examined variation. Furthermore, the accuracy was evaluated as a function of frequency and results were concluded to identify the limits of the used measuring setup. author: - first_name: Gregor full_name: Reschke, Gregor last_name: Reschke - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius citation: ama: 'Reschke G, Brosius A. Transient dynamic analysis: Performance evaluation of tactile measurement. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025:293-300. doi:10.21741/9781644903551-36' apa: 'Reschke, G., & Brosius, A. (2025). Transient dynamic analysis: Performance evaluation of tactile measurement. Materials Research Proceedings, 52, 293–300. https://doi.org/10.21741/9781644903551-36' bibtex: '@inproceedings{Reschke_Brosius_2025, title={Transient dynamic analysis: Performance evaluation of tactile measurement}, volume={52}, DOI={10.21741/9781644903551-36}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Reschke, Gregor and Brosius, Alexander}, year={2025}, pages={293–300} }' chicago: 'Reschke, Gregor, and Alexander Brosius. “Transient Dynamic Analysis: Performance Evaluation of Tactile Measurement.” In Materials Research Proceedings, 52:293–300. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-36.' ieee: 'G. Reschke and A. Brosius, “Transient dynamic analysis: Performance evaluation of tactile measurement,” in Materials Research Proceedings, Paderborn, 2025, vol. 52, pp. 293–300, doi: 10.21741/9781644903551-36.' mla: 'Reschke, Gregor, and Alexander Brosius. “Transient Dynamic Analysis: Performance Evaluation of Tactile Measurement.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, pp. 293–300, doi:10.21741/9781644903551-36.' short: 'G. Reschke, A. Brosius, in: Materials Research Proceedings, Materials Research Forum LLC, 2025, pp. 293–300.' conference: end_date: 2025-04-03 location: Paderborn name: 21st SheMet Conference start_date: 2025-04-01 date_created: 2025-04-10T11:27:20Z date_updated: 2025-04-10T11:33:28Z department: - _id: '43' - _id: '157' doi: 10.21741/9781644903551-36 intvolume: ' 52' keyword: - Joining - Machine Learning - Transient Dynamic Analysis language: - iso: eng page: 293-300 project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: 'Transient dynamic analysis: Performance evaluation of tactile measurement' type: conference user_id: '98812' volume: 52 year: '2025' ... --- _id: '59876' abstract: - lang: eng text: 'Abstract. Clinching is a conventional mechanical joining process used in Multi-Material Design in the automotive sector. To receive the desired geometrical characteristics in clinch joints, correct process design is required. To reduce the cost of finding fitting process parameters, numerical simulation of the joining process can be used to predict the geometrical characteristics, such as interlock, instead of an experimental approach. These numerical simulation models consume computational resources and time. In this paper machine learning is used to find correlations between features of the joining process and geometrical characteristics in the joint. This serves the purpose of predicting the joint’s target values more resource-efficiently. Modelling with machine learning requires a structured dataset with sufficient parameter variation. To create this data base the following procedure was used. For joining partners, a HC340LA steel alloy with 2 mm material thickness was used punch-sided and an EN AW 5182 aluminum alloy with 1.5 mm thickness was used die-sided. For this combination a suitable tool combination and punch distance was experimentally identified. A finite element model was created to reproduce the joining process. For the modelling of the material of both joining partners flow curves determined by Vallaster et al. were used [1]. The punch and die were recreated digitally by opto-electronic measurements and transformed into a mesh suitable for numerical simulation. The model was validated by comparing process values like the maximum force applied by the punch and geometrical values in the joints cross section. Additionally, a process window for suitable punch distances was experimentally determined. Afterwards a variation of 70 different process designs was conducted with variants inside and outside the process window. The results were used for training, testing and validating various machine learning models. All models competed against each other to find the must suited model to predict every geometric value. To ensure good model performances and prevent the model from overfitting, a tenfold cross validation was used for validating the models. Analysis of the results gives the following key findings: i) Good predictability is reached for the interlock and sheet thickness of the joint. ii) Prediction neck thickness showed low error values, but also low correlation. iii)The prediction of those key values for evaluating clinch joint characteristics by machine learning models positively impacts needed resources in comparison to numerical models.' author: - first_name: Jean-Patrick full_name: Ludwig, Jean-Patrick id: '76631' last_name: Ludwig - first_name: 'Seraphin ' full_name: 'Tsi-Nda Lontsi, Seraphin ' last_name: Tsi-Nda Lontsi - first_name: Jonas full_name: Neumann, Jonas last_name: Neumann - first_name: Lukas full_name: Kappis, Lukas last_name: Kappis - first_name: 'Christian ' full_name: 'Scharr, Christian ' last_name: Scharr - first_name: Wilko full_name: Flügge, Wilko last_name: Flügge - first_name: Marion full_name: Merklein, Marion last_name: Merklein - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: 'Ludwig J-P, Tsi-Nda Lontsi S, Neumann J, et al. Data driven prognosis of clinch joints in multi-material design. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-157' apa: Ludwig, J.-P., Tsi-Nda Lontsi, S., Neumann, J., Kappis, L., Scharr, C., Flügge, W., Merklein, M., & Meschut, G. (2025). Data driven prognosis of clinch joints in multi-material design. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-157 bibtex: '@inproceedings{Ludwig_Tsi-Nda Lontsi_Neumann_Kappis_Scharr_Flügge_Merklein_Meschut_2025, place={Paestum}, title={Data driven prognosis of clinch joints in multi-material design}, volume={54}, DOI={10.21741/9781644903599-157}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Ludwig, Jean-Patrick and Tsi-Nda Lontsi, Seraphin and Neumann, Jonas and Kappis, Lukas and Scharr, Christian and Flügge, Wilko and Merklein, Marion and Meschut, Gerson}, year={2025} }' chicago: 'Ludwig, Jean-Patrick, Seraphin Tsi-Nda Lontsi, Jonas Neumann, Lukas Kappis, Christian Scharr, Wilko Flügge, Marion Merklein, and Gerson Meschut. “Data Driven Prognosis of Clinch Joints in Multi-Material Design.” In Materials Research Proceedings, Vol. 54. Paestum: Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-157.' ieee: 'J.-P. Ludwig et al., “Data driven prognosis of clinch joints in multi-material design,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-157.' mla: Ludwig, Jean-Patrick, et al. “Data Driven Prognosis of Clinch Joints in Multi-Material Design.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-157. short: 'J.-P. Ludwig, S. Tsi-Nda Lontsi, J. Neumann, L. Kappis, C. Scharr, W. Flügge, M. Merklein, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, Paestum, 2025.' date_created: 2025-05-13T06:51:37Z date_updated: 2025-05-13T07:20:19Z department: - _id: '157' doi: 10.21741/9781644903599-157 intvolume: ' 54' language: - iso: eng place: Paestum publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC status: public title: Data driven prognosis of clinch joints in multi-material design type: conference user_id: '76631' volume: 54 year: '2025' ... --- _id: '60108' abstract: - lang: eng text: Abstract. In the field of mechanical engineering, destructive tests such as shear tests of mechanical joints are usually followed by imaging methods such as microsectioning or computed tomography (CT). They can help to interpret the measured load-displacement curves, analyze the failure behavior and validate numerical models. However, due to unloading, springback effects and crack closures can occur, which influence the state of the investigated specimen. In this context, in situ CT is able to explore the testing process with a specimen under load avoiding these influences. For in situ CT investigations, the displacement increase is interrupted at certain stop points. While the displacement is kept constant, the CT scan is performed. However, it was observed that the reaction force reduces during CT scanning, e. g. due to settling effects in the test setup. Although in situ CT is established now in research, little attention is paid to the uncertainties which arise from the discontinuous testing procedure. This study systematically explores the impact of these interruptions on the load-displacement behavior and the geometry of clinch points during tensile shear testing. To quantify the influence of the interruptions, loads at defined displacement levels and the final geometry are evaluated statistically. We found, that the load-displacement behavior of both test groups is similar. Despite some small but significant statistical deviations of the loads and the final geometry, our results show that, discontinuous testing has a high level of significance for the phenomena overserved in shear tests with clinch points. author: - first_name: D. full_name: Köhler, D. last_name: Köhler - first_name: J full_name: Troschitz, J last_name: Troschitz - first_name: R. full_name: Kupfer, R. last_name: Kupfer - first_name: M. full_name: Gude, M. last_name: Gude citation: ama: 'Köhler D, Troschitz J, Kupfer R, Gude M. In situ computed tomography – Analysis of settling effects during single-lap shear tests with clinch points. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-15' apa: Köhler, D., Troschitz, J., Kupfer, R., & Gude, M. (2025). In situ computed tomography – Analysis of settling effects during single-lap shear tests with clinch points. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-15 bibtex: '@inproceedings{Köhler_Troschitz_Kupfer_Gude_2025, title={In situ computed tomography – Analysis of settling effects during single-lap shear tests with clinch points}, volume={52}, DOI={10.21741/9781644903551-15}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Köhler, D. and Troschitz, J and Kupfer, R. and Gude, M.}, year={2025} }' chicago: Köhler, D., J Troschitz, R. Kupfer, and M. Gude. “In Situ Computed Tomography – Analysis of Settling Effects during Single-Lap Shear Tests with Clinch Points.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-15. ieee: 'D. Köhler, J. Troschitz, R. Kupfer, and M. Gude, “In situ computed tomography – Analysis of settling effects during single-lap shear tests with clinch points,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-15.' mla: Köhler, D., et al. “In Situ Computed Tomography – Analysis of Settling Effects during Single-Lap Shear Tests with Clinch Points.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-15. short: 'D. Köhler, J. Troschitz, R. Kupfer, M. Gude, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-06-02T20:05:01Z date_updated: 2025-06-02T20:18:20Z department: - _id: '157' - _id: '43' doi: 10.21741/9781644903551-15 intvolume: ' 52' language: - iso: eng project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC status: public title: In situ computed tomography – Analysis of settling effects during single-lap shear tests with clinch points type: conference user_id: '83408' volume: 52 year: '2025' ... --- _id: '60977' 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. author: - first_name: Malte Christian full_name: Schlichter, Malte Christian id: '61977' last_name: Schlichter - first_name: Özcan full_name: Harabati, Özcan id: '54972' last_name: Harabati - first_name: Jean-Patrick full_name: Ludwig, Jean-Patrick id: '76631' last_name: Ludwig - first_name: Max full_name: Böhnke, Max id: '45779' last_name: Böhnke - first_name: Christian Roman full_name: Bielak, Christian Roman id: '34782' last_name: Bielak - first_name: Mathias full_name: Bobbert, Mathias id: '7850' last_name: Bobbert - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: 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' 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 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} }' 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. 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.' 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. 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.' date_created: 2025-08-22T10:20:15Z date_updated: 2026-02-24T14:02:01Z department: - _id: '157' doi: 10.21741/9781644903599-148 intvolume: ' 54' language: - iso: eng project: - _id: '135' name: TRR 285 - Subproject A01 - _id: '131' name: TRR 285 - Project Area A - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints type: conference user_id: '7850' volume: 54 year: '2025' ... --- _id: '60978' abstract: - lang: eng 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. author: - first_name: Malte Christian full_name: Schlichter, Malte Christian id: '61977' last_name: Schlichter - first_name: Özcan full_name: Harabati, Özcan id: '54972' last_name: Harabati - first_name: Max full_name: Böhnke, Max id: '45779' last_name: Böhnke - first_name: Christian Roman full_name: Bielak, Christian Roman id: '34782' last_name: Bielak - first_name: Mathias full_name: Bobbert, Mathias id: '7850' last_name: Bobbert - first_name: Gerson full_name: Meschut, Gerson last_name: Meschut citation: 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' 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} }' 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. 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.' 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. short: 'M.C. Schlichter, Ö. Harabati, M. Böhnke, C.R. Bielak, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-08-22T10:45:56Z date_updated: 2026-02-24T14:02:35Z department: - _id: '157' doi: 10.21741/9781644903551-16 intvolume: ' 52' language: - iso: eng project: - _id: '131' name: TRR 285 - Project Area A - _id: '135' name: TRR 285 - Subproject A01 - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: Investigation on manufacturing-induced pre-deformation on the fatigue behaviour of clinched joints type: conference user_id: '7850' volume: 52 year: '2025' ... --- _id: '59587' abstract: - lang: eng 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. author: - first_name: Chin full_name: Chen, Chin last_name: Chen - first_name: Malte Christian full_name: Schlichter, Malte Christian id: '61977' last_name: Schlichter - first_name: Sven full_name: Harzheim, Sven last_name: Harzheim - first_name: Martin full_name: Hofmann, Martin last_name: Hofmann - first_name: Mathias full_name: Bobbert, Mathias id: '7850' last_name: Bobbert - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 - first_name: Thomas full_name: Wallmersperger, Thomas last_name: Wallmersperger citation: 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' 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 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} }' 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. 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.' date_created: 2025-04-15T11:14:53Z date_updated: 2026-02-24T13:43:56Z department: - _id: '157' doi: 10.21741/9781644903551-23 intvolume: ' 52' language: - iso: eng project: - _id: '131' name: 'TRR 285 - A: TRR 285 - Project Area A' - _id: '135' name: 'TRR 285 – A01: TRR 285 - Subproject A01' - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: High-cycle fatigue testing and parameter identification for numerical simulation of aluminum alloy EN AW-6014 type: conference user_id: '7850' volume: 52 year: '2025' ... --- _id: '60002' abstract: - lang: eng 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. author: - first_name: Özcan full_name: Harabati, Özcan id: '54972' last_name: Harabati - first_name: Christian Roman full_name: Bielak, Christian Roman id: '34782' last_name: Bielak - first_name: Max full_name: Böhnke, Max id: '45779' last_name: Böhnke - first_name: Malte Christian full_name: Schlichter, Malte Christian id: '61977' last_name: Schlichter - first_name: Marc full_name: Brockmeier, Marc last_name: Brockmeier - first_name: Mathias full_name: Bobbert, Mathias id: '7850' last_name: Bobbert - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: 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' 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' 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} }' 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.' 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.' 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.' 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.' date_created: 2025-05-20T12:50:34Z date_updated: 2026-02-24T13:59:43Z doi: 10.21741/9781644903551-19 intvolume: ' 52' language: - iso: eng project: - _id: '131' name: 'TRR 285 - A: TRR 285 - Project Area A' - _id: '135' name: 'TRR 285 – A01: TRR 285 - Subproject A01' - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: 'Cross-process damage modeling: A process-chain case study of clinching and self-pierced riveting for aluminum connections' type: conference user_id: '7850' volume: 52 year: '2025' ... --- _id: '60440' abstract: - lang: eng 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. author: - first_name: Pia Katharina full_name: Holtkamp, Pia Katharina id: '44935' last_name: Holtkamp - first_name: Christian Roman full_name: Bielak, Christian Roman id: '34782' last_name: Bielak - first_name: Mathias full_name: Bobbert, Mathias id: '7850' last_name: Bobbert - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: 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' 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 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} }' 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. 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.' 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. short: 'P.K. Holtkamp, C.R. Bielak, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-06-27T08:23:00Z date_updated: 2026-02-24T14:12:10Z department: - _id: '43' - _id: '157' doi: 10.21741/9781644903599-153 intvolume: ' 54' language: - iso: eng 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' - _id: '131' name: 'TRR 285 - A: TRR 285 - Project Area A' - _id: '135' name: 'TRR 285 – A01: TRR 285 - Subproject A01' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: Simulation of the joining process of graded hardened multi-range capable rivets type: conference user_id: '7850' volume: 54 year: '2025' ... --- _id: '59441' abstract: - lang: eng 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.' author: - first_name: Deekshith Reddy full_name: Devulapally, Deekshith Reddy id: '76837' last_name: Devulapally - first_name: Thomas full_name: Tröster, Thomas id: '553' last_name: Tröster citation: 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' 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 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. 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.' 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. short: 'D.R. Devulapally, T. Tröster, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' conference: end_date: 2025-04-03 location: Paderborn name: '21st International conference on sheet metal ' start_date: 2025-04-01 date_created: 2025-04-08T14:57:51Z date_updated: 2026-02-27T10:50:10Z department: - _id: '149' - _id: '9' - _id: '321' doi: 10.21741/9781644903551-21 intvolume: ' 52' language: - iso: eng project: - _id: '140' name: 'TRR 285 – B01: TRR 285 - Subproject B01' - _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' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC status: public title: Modelling strategies for non-rotationally symmetric joints type: conference user_id: '76837' volume: 52 year: '2025' ... --- _id: '61763' abstract: - lang: eng text: Abstract. Within the punch-bending process semi-finished products of strip or wire material are formed and punched in several subsequent steps into a finished product like brackets, mounts, contacts or spring elements. In the context of those multi-stage straightening and bending processes, cross-stage and quantity-dependent effects significantly leads to undesired component deviations. To optimize the punch-bending process with regard to these component deviations and thus the waste rate, the concept of a hybrid data-driven model is presented. To automatically acquire and process this hybrid data while also enable the usage by multiple clients, a digital twin has to be developed. In this paper the communication infrastructure between the punch-bending system and the digital twin is presented, using the Asset Administration Shell as specification. This automated communication is validated using exemplary data from the punch-bending system. author: - first_name: Henning full_name: Peters, Henning last_name: Peters - first_name: Andreas full_name: Mazur, Andreas last_name: Mazur - first_name: Ansgar full_name: Trächtler, Ansgar id: '552' last_name: Trächtler - first_name: Barbara full_name: Hammer, Barbara last_name: Hammer citation: ama: 'Peters H, Mazur A, Trächtler A, Hammer B. Integration of a digital twin for data-driven modeling of punch-bending processes using the asset administration shell. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-166' apa: Peters, H., Mazur, A., Trächtler, A., & Hammer, B. (2025). Integration of a digital twin for data-driven modeling of punch-bending processes using the asset administration shell. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-166 bibtex: '@inproceedings{Peters_Mazur_Trächtler_Hammer_2025, title={Integration of a digital twin for data-driven modeling of punch-bending processes using the asset administration shell}, volume={54}, DOI={10.21741/9781644903599-166}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Peters, Henning and Mazur, Andreas and Trächtler, Ansgar and Hammer, Barbara}, year={2025} }' chicago: Peters, Henning, Andreas Mazur, Ansgar Trächtler, and Barbara Hammer. “Integration of a Digital Twin for Data-Driven Modeling of Punch-Bending Processes Using the Asset Administration Shell.” In Materials Research Proceedings, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-166. ieee: 'H. Peters, A. Mazur, A. Trächtler, and B. Hammer, “Integration of a digital twin for data-driven modeling of punch-bending processes using the asset administration shell,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-166.' mla: Peters, Henning, et al. “Integration of a Digital Twin for Data-Driven Modeling of Punch-Bending Processes Using the Asset Administration Shell.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-166. short: 'H. Peters, A. Mazur, A. Trächtler, B. Hammer, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-10-08T16:11:24Z date_updated: 2025-10-30T12:51:26Z department: - _id: '153' - _id: '241' doi: 10.21741/9781644903599-166 intvolume: ' 54' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.21741/9781644903599-166 oa: '1' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC status: public title: Integration of a digital twin for data-driven modeling of punch-bending processes using the asset administration shell type: conference user_id: '82875' volume: 54 year: '2025' ... --- _id: '59907' abstract: - lang: eng text: Abstract. Flow forming is recognized for its precision in producing rotationally symmetric components, but the use of metastable austenitic stainless steel (AISI 304L) introduces challenges due to uncontrolled strain-induced α’ martensite formation. Variations in factors such as eccentricity and batch inconsistencies lead to unpredictable microstructural profiles, limiting reproducibility [1,2]. This study addresses these issues by incorporating thermal actuators for cryogenic cooling and induction heating to regulate forming temperatures, enabling control of the α’-martensite content. Experimental investigations demonstrate that local tempering during thermomechanical reverse flow forming produces discernible variations in microstructure, affecting mechanical and magnetic properties [3]. Controlled local adjustments of α’-martensite content allow for customization of properties in seamless tubes, advancing manufacturing capabilities for complex, defect-free components. The results presented demonstrate promising strategies for implementation within the context of closed-loop property control in flow forming. author: - first_name: Bahman full_name: Arian, Bahman id: '36287' last_name: Arian - first_name: Werner full_name: Homberg, Werner id: '233' last_name: Homberg - first_name: Lukas full_name: Kersting, Lukas last_name: Kersting - first_name: Ansgar full_name: Trächtler, Ansgar id: '552' last_name: Trächtler - first_name: Julian full_name: Rozo Vasquez, Julian last_name: Rozo Vasquez - first_name: Frank full_name: Walther, Frank last_name: Walther citation: ama: 'Arian B, Homberg W, Kersting L, Trächtler A, Rozo Vasquez J, Walther F. Advanced thermomechanical flow forming: A novel approach to α’-martensite control for enhanced material properties. In: Carlone P, Filice L, Umbrello D, eds. Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-127' apa: 'Arian, B., Homberg, W., Kersting, L., Trächtler, A., Rozo Vasquez, J., & Walther, F. (2025). Advanced thermomechanical flow forming: A novel approach to α’-martensite control for enhanced material properties. In P. Carlone, L. Filice, & D. Umbrello (Eds.), Materials Research Proceedings (Vol. 54). Materials Research Forum LLC. https://doi.org/10.21741/9781644903599-127' bibtex: '@inproceedings{Arian_Homberg_Kersting_Trächtler_Rozo Vasquez_Walther_2025, title={Advanced thermomechanical flow forming: A novel approach to α’-martensite control for enhanced material properties}, volume={54}, DOI={10.21741/9781644903599-127}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Arian, Bahman and Homberg, Werner and Kersting, Lukas and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}, editor={Carlone, Pierpaolo and Filice, Luigino and Umbrello, Domenico}, year={2025} }' chicago: 'Arian, Bahman, Werner Homberg, Lukas Kersting, Ansgar Trächtler, Julian Rozo Vasquez, and Frank Walther. “Advanced Thermomechanical Flow Forming: A Novel Approach to α’-Martensite Control for Enhanced Material Properties.” In Materials Research Proceedings, edited by Pierpaolo Carlone, Luigino Filice, and Domenico Umbrello, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-127.' ieee: 'B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, and F. Walther, “Advanced thermomechanical flow forming: A novel approach to α’-martensite control for enhanced material properties,” in Materials Research Proceedings, Paestum, Italy, 2025, vol. 54, doi: 10.21741/9781644903599-127.' mla: 'Arian, Bahman, et al. “Advanced Thermomechanical Flow Forming: A Novel Approach to α’-Martensite Control for Enhanced Material Properties.” Materials Research Proceedings, edited by Pierpaolo Carlone et al., vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-127.' short: 'B. Arian, W. Homberg, L. Kersting, A. Trächtler, J. Rozo Vasquez, F. Walther, in: P. Carlone, L. Filice, D. Umbrello (Eds.), Materials Research Proceedings, Materials Research Forum LLC, 2025.' conference: end_date: 2025-05-09 location: Paestum, Italy name: The 28th International ESAFORM Conference on Material Forming - ESAFORM 2025 start_date: 2025-05-06 date_created: 2025-05-15T06:59:28Z date_updated: 2025-10-30T13:55:08Z department: - _id: '156' - _id: '153' - _id: '241' doi: 10.21741/9781644903599-127 editor: - first_name: Pierpaolo full_name: Carlone, Pierpaolo last_name: Carlone - first_name: Luigino full_name: Filice, Luigino last_name: Filice - first_name: Domenico full_name: Umbrello, Domenico last_name: Umbrello has_accepted_license: '1' intvolume: ' 54' keyword: - Flow Forming - Thermomechanical Forming - α’-Martensite - Property Control language: - iso: eng main_file_link: - open_access: '1' url: https://mrforum.com/product/9781644903599-127/ oa: '1' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: 'Advanced thermomechanical flow forming: A novel approach to α’-martensite control for enhanced material properties' type: conference user_id: '36287' volume: 54 year: '2025' ... --- _id: '62022' abstract: - lang: eng text: Abstract. The incremental flow forming process features a large number of process parameter combinations that can be varied from pass to pass or during a pass. In the future however, a more efficient utilization of this large number of process parameter combinations and a compensation of process disturbances could be required. This is due to a rising demand for increasing the part complexity, e.g. by graded property structures or a more complex geometry. In this context, innovative approaches like closed-loop property control and optimal control are advantageous, but require fast process models of flow forming that are not state of the art. This paper thus proposes a new modelling approach of multi-pass flow forming especially taking the transfer behavior between process parameters and wall thickness evolution from pass to pass into focus. A hybrid modelling approach is developed that combines knowledge about the incremental process character with empirical data regression to a basic analytic relation. The basic relation is further extended by a multi-layer neural network to enhance the overall model accuracy. This hybrid modelling approach is finally validated using experimental data. Thus, it is shown that a suitable model structure was found in context of a future closed-loop control or optimal control for multi-pass flow forming. author: - first_name: Lukas full_name: Kersting, Lukas last_name: Kersting - first_name: Sharin Kumar full_name: Gunasagran, Sharin Kumar last_name: Gunasagran - first_name: Bahman full_name: Arian, Bahman id: '36287' last_name: Arian - first_name: Julian full_name: Rozo Vaszquez, Julian last_name: Rozo Vaszquez - first_name: Ansgar full_name: Trächtler, Ansgar id: '552' last_name: Trächtler - first_name: Werner full_name: Homberg, Werner id: '233' last_name: Homberg - first_name: Frank full_name: Walther, Frank last_name: Walther citation: ama: 'Kersting L, Gunasagran SK, Arian B, et al. Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-140' apa: Kersting, L., Gunasagran, S. K., Arian, B., Rozo Vaszquez, J., Trächtler, A., Homberg, W., & Walther, F. (2025). Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-140 bibtex: '@inproceedings{Kersting_Gunasagran_Arian_Rozo Vaszquez_Trächtler_Homberg_Walther_2025, title={Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model}, volume={54}, DOI={10.21741/9781644903599-140}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Kersting, Lukas and Gunasagran, Sharin Kumar and Arian, Bahman and Rozo Vaszquez, Julian and Trächtler, Ansgar and Homberg, Werner and Walther, Frank}, year={2025} }' chicago: Kersting, Lukas, Sharin Kumar Gunasagran, Bahman Arian, Julian Rozo Vaszquez, Ansgar Trächtler, Werner Homberg, and Frank Walther. “Real-Time Modelling of Incremental Multi-Pass Flow Forming by a Hybrid, Data-Based Model.” In Materials Research Proceedings, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-140. ieee: 'L. Kersting et al., “Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-140.' mla: Kersting, Lukas, et al. “Real-Time Modelling of Incremental Multi-Pass Flow Forming by a Hybrid, Data-Based Model.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-140. short: 'L. Kersting, S.K. Gunasagran, B. Arian, J. Rozo Vaszquez, A. Trächtler, W. Homberg, F. Walther, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-10-30T12:16:37Z date_updated: 2025-10-30T12:53:36Z department: - _id: '153' - _id: '241' - _id: '156' doi: 10.21741/9781644903599-140 intvolume: ' 54' language: - iso: eng main_file_link: - open_access: '1' url: 'https://doi.org/10.21741/9781644903599-140 ' oa: '1' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC status: public title: Real-time modelling of incremental multi-pass flow forming by a hybrid, data-based model type: conference user_id: '82875' volume: 54 year: '2025' ... --- _id: '59091' abstract: - lang: eng text: Abstract. Liquid Metal Embrittlement (LME) cracking is a well-documented issue encountered during resistance spot welding (RSW) of zinc-coated advanced high-strength steels (AHSS) in automotive manufacturing. Given that existing research has predominantly focused on laboratory-scale samples and lacks investigation into the load-bearing capacity of joints under crash conditions, this study aims to fill these gaps by analyzing third-generation zinc-coated AHSS. S-Rail components were produced through stamping to replicate real-world manufacturing conditions and geometries of automotive parts. To account for the disturbances typically encountered in production, samples with LME cracks were intentionally fabricated. Subsequently, a modified three-point bending test, assisted by numerical simulations, was developed to effectively apply loads to the weld spots of the S-Rail components. Results from crash tests demonstrated that observed light crack severity does not significantly compromise the joint's load-bearing capacity or lead to earlier joint failure. author: - first_name: Keke full_name: Yang, Keke id: '65085' last_name: Yang orcid: 0000-0001-9201-9304 - first_name: Max full_name: Biegler, Max last_name: Biegler - first_name: Linus full_name: Happe, Linus last_name: Happe - first_name: Marius full_name: Striewe, Marius id: '30228' last_name: Striewe - first_name: Viktoria full_name: Olfert, Viktoria id: '5974' last_name: Olfert - first_name: David full_name: Hein, David id: '7728' last_name: Hein - first_name: 'Michael ' full_name: 'Rethmeier, Michael ' last_name: Rethmeier - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: 'Yang K, Biegler M, Happe L, et al. Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-42' apa: 'Yang, K., Biegler, M., Happe, L., Striewe, M., Olfert, V., Hein, D., Rethmeier, M., & Meschut, G. (2025). Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-42' bibtex: '@inproceedings{Yang_Biegler_Happe_Striewe_Olfert_Hein_Rethmeier_Meschut_2025, title={Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components}, volume={52}, DOI={10.21741/9781644903551-42}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Yang, Keke and Biegler, Max and Happe, Linus and Striewe, Marius and Olfert, Viktoria and Hein, David and Rethmeier, Michael and Meschut, Gerson}, year={2025} }' chicago: 'Yang, Keke, Max Biegler, Linus Happe, Marius Striewe, Viktoria Olfert, David Hein, Michael Rethmeier, and Gerson Meschut. “Influence of Liquid Metal Embrittlement on Load-Bearing Capacity of Resistance Spot Welds under Crash Loads: A Study Based on S-Rail Components.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-42.' ieee: 'K. Yang et al., “Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-42.' mla: 'Yang, Keke, et al. “Influence of Liquid Metal Embrittlement on Load-Bearing Capacity of Resistance Spot Welds under Crash Loads: A Study Based on S-Rail Components.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-42.' short: 'K. Yang, M. Biegler, L. Happe, M. Striewe, V. Olfert, D. Hein, M. Rethmeier, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-03-25T07:59:49Z date_updated: 2025-12-26T13:44:36Z ddc: - '600' department: - _id: '157' doi: 10.21741/9781644903551-42 file: - access_level: closed content_type: application/pdf creator: kekeyang date_created: 2025-03-25T08:02:30Z date_updated: 2025-03-25T08:02:30Z file_id: '59092' file_name: Shemat.pdf file_size: 1901767 relation: main_file success: 1 file_date_updated: 2025-03-25T08:02:30Z has_accepted_license: '1' intvolume: ' 52' language: - iso: eng main_file_link: - open_access: '1' oa: '1' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: 'Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components' type: conference user_id: '65085' volume: 52 year: '2025' ... --- _id: '60604' abstract: - lang: eng text: Abstract. In the field of online condition monitoring, non-destructive testing methods using active acoustic testing [1] emerged as innovative tools. These techniques are particularly effective because damage in joined structures leads to significant changes in their vibrational characteristics. However, the consistent use of online condition monitoring through active acoustic testing combined with complex pattern recognition for early crack detection in joined components has not yet been fully established. This research aims to develop an online crack detection system employing pattern recognition techniques under cyclic loading during fatigue tests, utilizing non-contact active acoustic testing with laser vibrometry. Due to the wide range of materials that can be joined, mechanical joining processes can be used in many different industry branches. Self-pierce riveting (SPR), in particular, is a well-established joining process. Therefore, the investigations for online crack detection initially focus on SPR joints. To achieve this, the fatigue behavior of SPR joints in a lap-shear configuration was characterized. Experimental fatigue testing demonstrated that SPR joint failure occurs either through cracks propagating in the sheet material away from the rivet or in the rivet foot, depending on the material combination. Laser vibrometry has been successfully used as a crack detection system and has proven to be effective in detecting crack initiation in SPR joints. Cracks can be detected without contact regardless of the material combination, the damage location, the size of the damage, or the type of damage. The optimization of the crack detection system involved several key enhancements, including adjusting data acquisition to improve crack detection, incorporating principal component analysis (PCA) to reduce dimensionality, and implementing a classification model based on a global training dataset. An intuitive, problem-specific software demonstrator for analyzing the crack initiation behavior of SPR joints under cyclic loading was developed and iteratively optimized. Future work will focus on the implementation of an autoencoder network to further enhance crack detection capabilities. author: - first_name: Viktoria full_name: Olfert, Viktoria id: '5974' last_name: Olfert - first_name: Keke full_name: Yang, Keke id: '65085' last_name: Yang orcid: 0000-0001-9201-9304 - first_name: Maik full_name: Gollnick, Maik last_name: Gollnick - first_name: Jacob full_name: Krause, Jacob last_name: Krause - first_name: David full_name: Hein, David id: '7728' last_name: Hein - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: 'Olfert V, Yang K, Gollnick M, Krause J, Hein D, Meschut G. Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-154' apa: Olfert, V., Yang, K., Gollnick, M., Krause, J., Hein, D., & Meschut, G. (2025). Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-154 bibtex: '@inproceedings{Olfert_Yang_Gollnick_Krause_Hein_Meschut_2025, title={Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry}, volume={54}, DOI={10.21741/9781644903599-154}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Olfert, Viktoria and Yang, Keke and Gollnick, Maik and Krause, Jacob and Hein, David and Meschut, Gerson}, year={2025} }' chicago: Olfert, Viktoria, Keke Yang, Maik Gollnick, Jacob Krause, David Hein, and Gerson Meschut. “Analysis of Fatigue Behaviour of Self-Piercing Riveted Joints under Cyclic Loading Using Laser Vibrometry.” In Materials Research Proceedings, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-154. ieee: 'V. Olfert, K. Yang, M. Gollnick, J. Krause, D. Hein, and G. Meschut, “Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-154.' mla: Olfert, Viktoria, et al. “Analysis of Fatigue Behaviour of Self-Piercing Riveted Joints under Cyclic Loading Using Laser Vibrometry.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-154. short: 'V. Olfert, K. Yang, M. Gollnick, J. Krause, D. Hein, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-07-14T13:25:26Z date_updated: 2025-12-26T13:45:01Z department: - _id: '157' doi: 10.21741/9781644903599-154 intvolume: ' 54' language: - iso: eng main_file_link: - open_access: '1' oa: '1' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry type: conference user_id: '65085' volume: 54 year: '2025' ... --- _id: '59154' abstract: - lang: eng text: Abstract. Lightweight design is one of the central topics of the automotive industry since reducing mass can save emissions over the entire life cycle of a component. Nowadays, vehicle structures usually consist of a multi-material design, which poses the additional challenge of joining these different materials. Mechanical joining is the most common way of joining different types of materials. Cast aluminium alloys of the AlSi system have a low ductility, which causes cracks during the mechanical joining process in the joint. One research approach is to achieve a fine microstructure by influencing the solidification rate since this results in increased mechanical properties, specifically the elongation at fracture and yield strength. A very fine microstructure can be achieved by utilizing Twin-roll casting (TRC) which is a continuous casting process in which high solidification rates of more than 100 K/s occur. In this study, the hypoeutectic cast aluminium alloy AlSi9 is processed in the TRC process using copper rollers. The cast strips are investigated regarding the microstructure-property correlation. A variation of the roller materials and cooling conditions allows for an increase in the solidification rate, whereby a defined, fine microstructure can be achieved, which enhances the mechanical properties of the hypoeutectic aluminium casting alloys. author: - first_name: Moritz full_name: Neuser, Moritz id: '32340' last_name: Neuser - first_name: Kay-Peter full_name: Hoyer, Kay-Peter id: '48411' last_name: Hoyer - first_name: Mirko full_name: Schaper, Mirko id: '43720' last_name: Schaper citation: ama: 'Neuser M, Hoyer K-P, Schaper M. Processing of the hypoeutectic AlSi9 alloy with twin-roll casting by using copper shells. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-26' apa: Neuser, M., Hoyer, K.-P., & Schaper, M. (2025). Processing of the hypoeutectic AlSi9 alloy with twin-roll casting by using copper shells. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-26 bibtex: '@inproceedings{Neuser_Hoyer_Schaper_2025, title={Processing of the hypoeutectic AlSi9 alloy with twin-roll casting by using copper shells}, volume={52}, DOI={10.21741/9781644903551-26}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Neuser, Moritz and Hoyer, Kay-Peter and Schaper, Mirko}, year={2025} }' chicago: Neuser, Moritz, Kay-Peter Hoyer, and Mirko Schaper. “Processing of the Hypoeutectic AlSi9 Alloy with Twin-Roll Casting by Using Copper Shells.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-26. ieee: 'M. Neuser, K.-P. Hoyer, and M. Schaper, “Processing of the hypoeutectic AlSi9 alloy with twin-roll casting by using copper shells,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-26.' mla: Neuser, Moritz, et al. “Processing of the Hypoeutectic AlSi9 Alloy with Twin-Roll Casting by Using Copper Shells.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-26. short: 'M. Neuser, K.-P. Hoyer, M. Schaper, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-03-26T15:15:15Z date_updated: 2025-03-26T15:17:46Z department: - _id: '9' - _id: '158' doi: 10.21741/9781644903551-26 intvolume: ' 52' language: - iso: eng publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: Processing of the hypoeutectic AlSi9 alloy with twin-roll casting by using copper shells type: conference user_id: '48411' volume: 52 year: '2025' ... --- _id: '59155' abstract: - lang: eng text: Abstract. Twin-Roll-Casting (TRC) is an energy- and cost-efficient process to produce near-net-shape aluminum strips. Due to the high affinity of molten aluminum to steel surfaces, those rollers show signs of wear throughout the rolling campaign. This leads to the necessity of restoring the worn surfaces to suitable parameters. The easiest way is to grind the surface till all superficial defects are omitted. However, the thickness of the roller is not endless, therefore the rollers must be replaced after a certain amount of surface reconditioning. This ultimately leads to the non-usability of the roller. This research shows a route to recondition the surface including the possibility of renewing worn-down surfaces with an energy- and cost-efficient high-velocity oxygen fuel (HVOF) treatment with subsequent grinding to the desired initial surface parameters. author: - first_name: Martin full_name: Lauth, Martin id: '13858' last_name: Lauth - first_name: Kay-Peter full_name: Hoyer, Kay-Peter id: '48411' last_name: Hoyer - first_name: Mirko full_name: Schaper, Mirko id: '43720' last_name: Schaper - first_name: Winfried full_name: Gräfen, Winfried last_name: Gräfen citation: ama: 'Lauth M, Hoyer K-P, Schaper M, Gräfen W. Cost-effective repair solution for twin-roll-caster rollers. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-5' apa: Lauth, M., Hoyer, K.-P., Schaper, M., & Gräfen, W. (2025). Cost-effective repair solution for twin-roll-caster rollers. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-5 bibtex: '@inproceedings{Lauth_Hoyer_Schaper_Gräfen_2025, title={Cost-effective repair solution for twin-roll-caster rollers}, volume={52}, DOI={10.21741/9781644903551-5}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Lauth, Martin and Hoyer, Kay-Peter and Schaper, Mirko and Gräfen, Winfried}, year={2025} }' chicago: Lauth, Martin, Kay-Peter Hoyer, Mirko Schaper, and Winfried Gräfen. “Cost-Effective Repair Solution for Twin-Roll-Caster Rollers.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-5. ieee: 'M. Lauth, K.-P. Hoyer, M. Schaper, and W. Gräfen, “Cost-effective repair solution for twin-roll-caster rollers,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-5.' mla: Lauth, Martin, et al. “Cost-Effective Repair Solution for Twin-Roll-Caster Rollers.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-5. short: 'M. Lauth, K.-P. Hoyer, M. Schaper, W. Gräfen, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-03-26T15:16:31Z date_updated: 2025-03-26T15:17:51Z department: - _id: '9' - _id: '158' doi: 10.21741/9781644903551-5 intvolume: ' 52' language: - iso: eng publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: Cost-effective repair solution for twin-roll-caster rollers type: conference user_id: '48411' volume: 52 year: '2025' ... --- _id: '60198' abstract: - lang: eng text: Abstract. The growing significance of lightweight design, reveals drawbacks of conventional joining processes such as welding, which are known to consume a considerable amount of energy. This fosters the use of mechanical joining processes including clinching. However, the lack of universally applicable design methods results in a cost- and time-intensive design process. The utilization of machine learning methods can overcome these drawbacks. To ensure a reliable clinch joint design, inherent uncertainties of the design parameter such as tool deviations need to be considered in the design process. Varying distributions of design parameters, due to changes in the manufacturing process, can lead to high-computational effort in recalculating the resulting clinch joint properties with numerical simulations. Current metamodel-based methods for consideration of inherent uncertainties within the design parameters do not investigate the transferability of metamodels to different distributions of design parameters, which can lead to incorrect predictions. Therefore, this contribution investigates the performance of several metamodels on differently distributed design parameters. The obtained results indicate that metamodels demonstrate the best performance when training and evaluation distributions are identical and that polynomial regression models perform best on disparate distributions, when trained on uniform distributions. author: - first_name: Jonathan-Markus full_name: Einwag, Jonathan-Markus last_name: Einwag - first_name: Yannik full_name: Mayer, Yannik last_name: Mayer - first_name: Stefan full_name: Goetz, Stefan last_name: Goetz - first_name: Sandro full_name: Wartzack, Sandro last_name: Wartzack citation: ama: 'Einwag J-M, Mayer Y, Goetz S, Wartzack S. Impact of the parameter distribution on the predictive quality of metamodels for clinch joint properties. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-35' apa: Einwag, J.-M., Mayer, Y., Goetz, S., & Wartzack, S. (2025). Impact of the parameter distribution on the predictive quality of metamodels for clinch joint properties. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-35 bibtex: '@inproceedings{Einwag_Mayer_Goetz_Wartzack_2025, title={Impact of the parameter distribution on the predictive quality of metamodels for clinch joint properties}, volume={52}, DOI={10.21741/9781644903551-35}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Einwag, Jonathan-Markus and Mayer, Yannik and Goetz, Stefan and Wartzack, Sandro}, year={2025} }' chicago: Einwag, Jonathan-Markus, Yannik Mayer, Stefan Goetz, and Sandro Wartzack. “Impact of the Parameter Distribution on the Predictive Quality of Metamodels for Clinch Joint Properties.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-35. ieee: 'J.-M. Einwag, Y. Mayer, S. Goetz, and S. Wartzack, “Impact of the parameter distribution on the predictive quality of metamodels for clinch joint properties,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-35.' mla: Einwag, Jonathan-Markus, et al. “Impact of the Parameter Distribution on the Predictive Quality of Metamodels for Clinch Joint Properties.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-35. short: 'J.-M. Einwag, Y. Mayer, S. Goetz, S. Wartzack, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-06-12T15:03:22Z date_updated: 2025-06-12T15:06:41Z doi: 10.21741/9781644903551-35 intvolume: ' 52' language: - iso: eng project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '132' name: 'TRR 285 - B: TRR 285 - Project Area B' - _id: '144' name: 'TRR 285 – B05: TRR 285 - Subproject B05' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC status: public title: Impact of the parameter distribution on the predictive quality of metamodels for clinch joint properties type: conference user_id: '107109' volume: 52 year: '2025' ... --- _id: '59485' abstract: - lang: eng text: This paper focuses on the failure behavior of specimens with various configurations of clinched joints under shear tensile loading. The primary objective is to assess the influence of the joining direction and the spatial arrangement of clinched joints on their mechanical performance. A number of experiments was conducted, focusing on three clinched joints arranged in different configurations, each varying in terms of joining direction and spacing. These configurations were subjected to shear tensile tests, with force-displacement curves recorded for each sample to provide a detailed characterization of their structural response. The experimental findings indicate that the specific arrangement of the clinched joints, in terms of joining direction, has a marginal impact on the overall failure behavior. This suggests that intricate modifications to the joining direction are unnecessary to achieve improved mechanical performance in such applications. These results offer valuable insights for the design of clinched joint assemblies, indicating that simplified joining strategies may suffice without compromising structural integrity under shear loading. author: - first_name: Eugen full_name: Wolf, Eugen last_name: Wolf - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius citation: ama: 'Wolf E, Brosius A. Investigation failure behavior in the shear tensile test with respect to the arrangements of clinched joints. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025:86-92. doi:10.21741/9781644903551-11' apa: Wolf, E., & Brosius, A. (2025). Investigation failure behavior in the shear tensile test with respect to the arrangements of clinched joints. Materials Research Proceedings, 52, 86–92. https://doi.org/10.21741/9781644903551-11 bibtex: '@inproceedings{Wolf_Brosius_2025, title={Investigation failure behavior in the shear tensile test with respect to the arrangements of clinched joints}, volume={52}, DOI={10.21741/9781644903551-11}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Wolf, Eugen and Brosius, Alexander}, year={2025}, pages={86–92} }' chicago: Wolf, Eugen, and Alexander Brosius. “Investigation Failure Behavior in the Shear Tensile Test with Respect to the Arrangements of Clinched Joints.” In Materials Research Proceedings, 52:86–92. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-11. ieee: 'E. Wolf and A. Brosius, “Investigation failure behavior in the shear tensile test with respect to the arrangements of clinched joints,” in Materials Research Proceedings, Paderborn, 2025, vol. 52, pp. 86–92, doi: 10.21741/9781644903551-11.' mla: Wolf, Eugen, and Alexander Brosius. “Investigation Failure Behavior in the Shear Tensile Test with Respect to the Arrangements of Clinched Joints.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, pp. 86–92, doi:10.21741/9781644903551-11. short: 'E. Wolf, A. Brosius, in: Materials Research Proceedings, Materials Research Forum LLC, 2025, pp. 86–92.' conference: end_date: 2025-04-03 location: Paderborn name: 21st International Conference on Sheet Metal start_date: 2025-04-01 date_created: 2025-04-10T11:28:28Z date_updated: 2025-06-23T07:26:23Z department: - _id: '630' doi: 10.21741/9781644903551-11 intvolume: ' 52' keyword: - Joining - Sheet Metal - Clinching language: - iso: eng page: ' 86 - 92' project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '132' name: 'TRR 285 - B: TRR 285 - Project Area B' - _id: '140' name: 'TRR 285 – B01: TRR 285 - Subproject B01' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC status: public title: Investigation failure behavior in the shear tensile test with respect to the arrangements of clinched joints type: conference user_id: '104464' volume: 52 year: '2025' ... --- _id: '60439' abstract: - lang: eng text: Abstract. Mechanical joints are traditionally analyzed through destructive micrograph analysis, which may compromise internal geometry and morphology, as evidenced by radial cracks in semi-tubular self-pierce riveting. In contrast, industrial X-ray computed tomography (XCT) offers a non-destructive method for component diagnosis, providing volumetric insights without damaging the sample and enabling dimensional measurement. The DFG-funded Collaborative Research Center TRR 285 is exploring XCT's application in assessing mechanical joinability across various joining processes and materials, particularly in multi-material systems like steel-aluminum joints. XCT faces challenges in accurately capturing multi-material compositions, leading to artifacts that complicate interface detection. This research aims to validate XCT for joint investigations, yielding quantitative characteristics that surpass those from traditional micrograph analysis. author: - first_name: M. full_name: Lechner, M. last_name: Lechner - first_name: Thomas full_name: Borgert, Thomas id: '83141' last_name: Borgert - first_name: Matthias full_name: Busch, Matthias id: '83421' last_name: Busch orcid: https://orcid.org/0000-0002-8456-3374 - first_name: A. full_name: Harms, A. last_name: Harms - first_name: Pia Katharina full_name: Holtkamp, Pia Katharina id: '44935' last_name: Holtkamp - first_name: D. full_name: Römisch, D. last_name: Römisch - first_name: Simon full_name: Wituschek, Simon id: '83423' last_name: Wituschek - first_name: Fabian full_name: Kappe, Fabian id: '66459' last_name: Kappe citation: ama: 'Lechner M, Borgert T, Busch M, et al. Non-destructive testing in versatile joining processes. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-12' apa: Lechner, M., Borgert, T., Busch, M., Harms, A., Holtkamp, P. K., Römisch, D., Wituschek, S., & Kappe, F. (2025). Non-destructive testing in versatile joining processes. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-12 bibtex: '@inproceedings{Lechner_Borgert_Busch_Harms_Holtkamp_Römisch_Wituschek_Kappe_2025, title={Non-destructive testing in versatile joining processes}, volume={52}, DOI={10.21741/9781644903551-12}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Lechner, M. and Borgert, Thomas and Busch, Matthias and Harms, A. and Holtkamp, Pia Katharina and Römisch, D. and Wituschek, Simon and Kappe, Fabian}, year={2025} }' chicago: Lechner, M., Thomas Borgert, Matthias Busch, A. Harms, Pia Katharina Holtkamp, D. Römisch, Simon Wituschek, and Fabian Kappe. “Non-Destructive Testing in Versatile Joining Processes.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-12. ieee: 'M. Lechner et al., “Non-destructive testing in versatile joining processes,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-12.' mla: Lechner, M., et al. “Non-Destructive Testing in Versatile Joining Processes.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-12. short: 'M. Lechner, T. Borgert, M. Busch, A. Harms, P.K. Holtkamp, D. Römisch, S. Wituschek, F. Kappe, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-06-27T07:56:32Z date_updated: 2025-06-27T08:17:00Z department: - _id: '43' - _id: '157' doi: 10.21741/9781644903551-12 intvolume: ' 52' language: - iso: eng project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '145' name: 'TRR 285 – C01: TRR 285 - Subproject C01' - _id: '147' name: 'TRR 285 – C03: TRR 285 - Subproject C03' - _id: '146' name: 'TRR 285 – C02: TRR 285 - Subproject C02' - _id: '149' name: 'TRR 285 – C05: TRR 285 - Subproject C05' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: Non-destructive testing in versatile joining processes type: conference user_id: '44935' volume: 52 year: '2025' ... --- _id: '61174' abstract: - lang: eng text: Abstract. Mechanical joining methods, such as clinching, are characterised by locally large plastic deformations of the sheet metal to be joined. The majority of the thereby inserted work is transformed into heat. The heat generation and temperature evolution are systematically studied herein by means of thermomechanical process simulations for joining the dual-phase steel HCT590X and the aluminium alloy EN-AW 6014. The thermal-induced softening of the material is incorporated by a suitable coupled thermoplastic constitutive model. It is observed how the tools significantly and importantly contribute to the heat exchange. They reduce peak temperature increases of 225 K (without heat transfer to tools) to less than 90 K for realistic behaviour of contact heat transfer. Overall, increases in temperature during clinch joining can be expected to remain below 90 K for steel-steel joints and around 50 K for aluminium-aluminium joints. author: - first_name: J. full_name: Friedlein, J. last_name: Friedlein - first_name: P. full_name: Steinmann, P. last_name: Steinmann - first_name: J. full_name: Mergheim, J. last_name: Mergheim citation: ama: 'Friedlein J, Steinmann P, Mergheim J. Influence of thermal effects on clinch joining of sheet metal. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-22' apa: Friedlein, J., Steinmann, P., & Mergheim, J. (2025). Influence of thermal effects on clinch joining of sheet metal. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-22 bibtex: '@inproceedings{Friedlein_Steinmann_Mergheim_2025, title={Influence of thermal effects on clinch joining of sheet metal}, volume={52}, DOI={10.21741/9781644903551-22}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Friedlein, J. and Steinmann, P. and Mergheim, J.}, year={2025} }' chicago: Friedlein, J., P. Steinmann, and J. Mergheim. “Influence of Thermal Effects on Clinch Joining of Sheet Metal.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-22. ieee: 'J. Friedlein, P. Steinmann, and J. Mergheim, “Influence of thermal effects on clinch joining of sheet metal,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-22.' mla: Friedlein, J., et al. “Influence of Thermal Effects on Clinch Joining of Sheet Metal.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-22. short: 'J. Friedlein, P. Steinmann, J. Mergheim, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-09-10T14:33:50Z date_updated: 2025-09-10T14:37:40Z doi: 10.21741/9781644903551-22 intvolume: ' 52' language: - iso: eng project: - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '131' name: TRR 285 - Project Area A - _id: '139' name: TRR 285 - Subproject A05 publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC status: public title: Influence of thermal effects on clinch joining of sheet metal type: conference user_id: '84990' volume: 52 year: '2025' ...