--- _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: '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: '64562' 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. author: - first_name: Alrik full_name: Dargel, Alrik id: '114764' last_name: Dargel - first_name: Daniel full_name: Köhler, Daniel id: '83408' last_name: Köhler - first_name: Maik full_name: Gude, Maik last_name: Gude - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer citation: 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.' 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).' 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} }' 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.' 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.' 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.' 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.' conference: end_date: 2025-11-28 location: Dresden name: 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025 start_date: 2025-11-27 date_created: 2026-02-20T14:17:33Z date_updated: 2026-02-24T15:12:59Z ddc: - '620' editor: - first_name: Martina full_name: Zimmermann, Martina last_name: Zimmermann file: - access_level: closed content_type: application/pdf creator: adargel date_created: 2026-02-20T14:14:36Z date_updated: 2026-02-20T14:14:36Z file_id: '64564' file_name: V-31-Dargel_v03.pdf file_size: 398450 relation: main_file success: 1 file_date_updated: 2026-02-20T14:14:36Z has_accepted_license: '1' intvolume: ' 43' keyword: - in situ CT - Thermokammer - Thermoplastische FKV language: - iso: ger page: 165-170 place: Sankt Augustin project: - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '148' name: TRR 285 - Subproject C04 publication: Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025 publication_identifier: isbn: - 978-3-88355-454-9 publication_status: published publisher: Deutsche Gesellschaft für Materialkunde e.V. (DGM) status: public title: 'In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse' type: conference user_id: '114764' volume: 43 year: '2025' ... --- _id: '61767' abstract: - lang: eng 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." article_number: '131' article_type: original author: - first_name: Daniel full_name: Köhler, Daniel id: '83408' last_name: Köhler - first_name: Alrik full_name: Dargel, Alrik id: '114764' last_name: Dargel - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Maik full_name: Gude, Maik last_name: Gude - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer 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 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 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} }' 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. 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.' 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). date_created: 2025-10-09T08:27:41Z date_updated: 2026-02-24T15:13:52Z doi: 10.1007/s10921-025-01270-1 intvolume: ' 44' issue: '4' language: - iso: eng project: - _id: '133' name: TRR 285 - Project Area C - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '148' name: TRR 285 - Subproject C04 publication: Journal of Nondestructive Evaluation publication_identifier: issn: - 0195-9298 - 1573-4862 publication_status: published publisher: Springer Science and Business Media LLC status: public title: In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials type: journal_article user_id: '114764' volume: 44 year: '2025' ... --- _id: '61149' abstract: - lang: eng text: The use of continuous fiber-reinforced thermoplastics (FRTP) in automotive industry increases due to their excellent material properties and possibility of rapid processing. The scale spanning heterogeneity of their material structure and its influence on the material behavior, however, presents significant challenges for most joining technologies, such as self-piercing riveting (SPR). During mechanical joining, the material structure is significantly altered within and around the joining zone, heavily influencing the material behavior. A comprehensive understanding of the underlying phenomena of material alteration during the SPR process is essential as basis for validating numerical simulations. This study examines the material structure at ten stages of a step-setting test of SPR with two FRTP sheets with glass-fiber reinforcement. Utilizing X-ray computed tomography (CT), the damage phenomena within different areas of the setting test are analyzed three-dimensionally and key parameters are quantified. Dominating phenomena during the penetration of the rivet into the laminate are fiber failure (FF), interfiber failure (IFF) and fiber bending, while delamination, fiber kinking and roving splitting are also observed. At the final stages, the bottom layers of the second sheet collapse and form a bulge into the cavity of the die. author: - first_name: Alrik full_name: Dargel, Alrik id: '114764' last_name: Dargel - first_name: Benjamin full_name: Gröger, Benjamin last_name: Gröger - first_name: Malte Christian full_name: Schlichter, Malte Christian id: '61977' last_name: Schlichter - first_name: Johannes full_name: Gerritzen, Johannes id: '105344' last_name: Gerritzen orcid: 0000-0002-0169-8602 - first_name: Daniel full_name: Köhler, Daniel id: '83408' last_name: Köhler - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 - first_name: Maik full_name: Gude, Maik last_name: Gude - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer citation: ama: 'Dargel A, Gröger B, Schlichter MC, et al. LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION. In: Gomes JFS, Meguid SA, eds. Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025). FEUP; 2025. doi:10.24840/978-972-752-323-8' apa: 'Dargel, A., Gröger, B., Schlichter, M. C., Gerritzen, J., Köhler, D., Meschut, G., Gude, M., & Kupfer, R. (2025). LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION. In J. F. S. Gomes & S. A. Meguid (Eds.), Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025). FEUP. https://doi.org/10.24840/978-972-752-323-8' bibtex: '@inproceedings{Dargel_Gröger_Schlichter_Gerritzen_Köhler_Meschut_Gude_Kupfer_2025, place={Porto}, title={LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION}, DOI={10.24840/978-972-752-323-8}, booktitle={Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)}, publisher={FEUP}, author={Dargel, Alrik and Gröger, Benjamin and Schlichter, Malte Christian and Gerritzen, Johannes and Köhler, Daniel and Meschut, Gerson and Gude, Maik and Kupfer, Robert}, editor={Gomes, J.F. Silva and Meguid, Shaker A.}, year={2025} }' chicago: 'Dargel, Alrik, Benjamin Gröger, Malte Christian Schlichter, Johannes Gerritzen, Daniel Köhler, Gerson Meschut, Maik Gude, and Robert Kupfer. “LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION.” In Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), edited by J.F. Silva Gomes and Shaker A. Meguid. Porto: FEUP, 2025. https://doi.org/10.24840/978-972-752-323-8.' ieee: 'A. Dargel et al., “LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION,” in Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), Porto, 2025, doi: 10.24840/978-972-752-323-8.' mla: 'Dargel, Alrik, et al. “LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION.” Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), edited by J.F. Silva Gomes and Shaker A. Meguid, FEUP, 2025, doi:10.24840/978-972-752-323-8.' short: 'A. Dargel, B. Gröger, M.C. Schlichter, J. Gerritzen, D. Köhler, G. Meschut, M. Gude, R. Kupfer, in: J.F.S. Gomes, S.A. Meguid (Eds.), Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), FEUP, Porto, 2025.' conference: end_date: 2025-07-18 location: Porto name: 8th International Conference on Integrity-Reliability-Failure (IRF2025) start_date: 2025-07-15 date_created: 2025-09-08T11:52:45Z date_updated: 2026-02-27T06:45:17Z doi: 10.24840/978-972-752-323-8 editor: - first_name: J.F. Silva full_name: Gomes, J.F. Silva last_name: Gomes - first_name: Shaker A. full_name: Meguid, Shaker A. last_name: Meguid keyword: - self-piercing riveting - computed tomography - thermoplastic composites - process-structure-interaction language: - iso: eng main_file_link: - open_access: '1' url: https://www.researchgate.net/publication/395593556_LOCAL_DEFORMATION_AND_FAILURE_OF_COMPOSITES_DURING_SELF-PIERCING_RIVETING_A_CT_BASED_MICROSTRUCTURE_INVESTIGATION oa: '1' place: Porto project: - _id: '133' name: TRR 285 - Project Area C - _id: '148' name: TRR 285 - Subproject C04 - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '131' name: TRR 285 - Project Area A - _id: '137' name: TRR 285 - Subproject A03 - _id: '135' name: TRR 285 - Subproject A01 publication: Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025) publication_identifier: isbn: - '9789727523238' publication_status: published publisher: FEUP status: public title: 'LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION' type: conference user_id: '105344' year: '2025' ... --- _id: '63828' article_number: '100368' author: - first_name: Johannes full_name: Gerritzen, Johannes id: '105344' last_name: Gerritzen orcid: 0000-0002-0169-8602 - first_name: Kunal full_name: Chopra, Kunal last_name: Chopra - first_name: Gregor full_name: Reschke, Gregor id: '98812' last_name: Reschke - first_name: Andreas full_name: Hornig, Andreas last_name: Hornig - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius - first_name: Maik full_name: Gude, Maik last_name: Gude citation: 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 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 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} }' 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. 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.' 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. short: J. Gerritzen, K. Chopra, G. Reschke, A. Hornig, A. Brosius, M. Gude, Journal of Advanced Joining Processes 13 (2025). date_created: 2026-02-02T08:32:04Z date_updated: 2026-02-27T06:45:47Z doi: 10.1016/j.jajp.2025.100368 intvolume: ' 13' language: - iso: eng project: - _id: '137' name: TRR 285 - Subproject A03 - _id: '131' name: TRR 285 - Project Area A - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '133' name: TRR 285 - Project Area C - _id: '148' name: TRR 285 - Subproject C04 publication: Journal of Advanced Joining Processes publication_identifier: issn: - 2666-3309 publication_status: published publisher: Elsevier BV status: public title: Quality assurance of clinched joints using explainable machine learning type: journal_article user_id: '105344' volume: 13 year: '2025' ... --- _id: '58348' abstract: - lang: eng text: ' Clinching is a mechanical joining technology, in which a mainly form-fit joint is created by means of local cold forming. To characterize the load-bearing behavior of such joints, they are typically analyzed destructively, for example by tensile-shear tests in combination with metallographic sections. However, both the initiation and progress of failure can only be described to a limited extent by this method. Furthermore, these tests allow only limited conclusions about clinch points under in-service loading. More purposefully, clinch points can be analyzed nondestructively by combining in-situ computed tomography (CT) and transient dynamic analysis (TDA). The TDA continuously measures the dynamic behavior of the specimen and indicates failure events like crack initiation, which then can be evaluated thoroughly by stopping the test and performing a CT scan. To qualify the TDA for this task, it is necessary to link the observed damage behavior with specific dynamic characteristics. In this work, the complementation of in-situ CT and TDA is investigated by testing a clinched single-lap tensile-shear specimen made of aluminum. The testing procedure is stepwise: at certain displacement levels, the specimen is investigated by in-situ CT and TDA. While the in-situ CT provides the location, extent, and development of the failure phenomena, the TDA uses this information to evaluate the dynamic signal and detect relevant frequency ranges, which indicate damage events. The results demonstrate, that failure initiation and progression can be analyzed efficiently by combining both measuring systems. The TDA reliably detects relevant signal changes in the monitored frequency band. By means of in-situ computed tomography, the corresponding failure phenomena can be described in detail, enhancing the understanding of the load-bearing and deformation behavior of clinch points. The concatenation of characteristic signal changes and observed failure phenomena can henceforth be transferred to analyze complex structures during operation nondestructively by TDA. ' article_type: original author: - first_name: Gregor full_name: Reschke, Gregor last_name: Reschke - first_name: Daniel full_name: Köhler, Daniel last_name: Köhler - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Maik full_name: Gude, Maik last_name: Gude - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius citation: ama: 'Reschke G, Köhler D, Kupfer R, Troschitz J, Gude M, Brosius A. In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering. Published online 2024. doi:10.1177/09544089241251646' apa: 'Reschke, G., Köhler, D., Kupfer, R., Troschitz, J., Gude, M., & Brosius, A. (2024). In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering. https://doi.org/10.1177/09544089241251646' bibtex: '@article{Reschke_Köhler_Kupfer_Troschitz_Gude_Brosius_2024, title={In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points}, DOI={10.1177/09544089241251646}, journal={Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering}, publisher={SAGE Publications}, author={Reschke, Gregor and Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik and Brosius, Alexander}, year={2024} }' chicago: 'Reschke, Gregor, Daniel Köhler, Robert Kupfer, Juliane Troschitz, Maik Gude, and Alexander Brosius. “In-Situ Computed Tomography and Transient Dynamic Analysis – Failure Analysis of a Single-Lap Tensile-Shear Test with Clinch Points.” Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2024. https://doi.org/10.1177/09544089241251646.' ieee: 'G. Reschke, D. Köhler, R. Kupfer, J. Troschitz, M. Gude, and A. Brosius, “In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points,” Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2024, doi: 10.1177/09544089241251646.' mla: 'Reschke, Gregor, et al. “In-Situ Computed Tomography and Transient Dynamic Analysis – Failure Analysis of a Single-Lap Tensile-Shear Test with Clinch Points.” Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, SAGE Publications, 2024, doi:10.1177/09544089241251646.' short: 'G. Reschke, D. Köhler, R. Kupfer, J. Troschitz, M. Gude, A. Brosius, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering (2024).' date_created: 2025-01-23T19:21:45Z date_updated: 2025-01-23T19:32:03Z department: - _id: '43' - _id: '157' doi: 10.1177/09544089241251646 keyword: - Clinching - Non-destructive testing - Transient Dynamic Analysis language: - iso: eng main_file_link: - open_access: '1' oa: '1' project: - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: 'Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering' publication_identifier: issn: - 0954-4089 - 2041-3009 publication_status: published publisher: SAGE Publications quality_controlled: '1' status: public title: In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points type: journal_article user_id: '98812' year: '2024' ... --- _id: '60106' abstract: - lang: eng text: ' Clinching is a mechanical joining technology, in which a mainly form-fit joint is created by means of local cold forming. To characterize the load-bearing behavior of such joints, they are typically analyzed destructively, for example by tensile-shear tests in combination with metallographic sections. However, both the initiation and progress of failure can only be described to a limited extent by this method. Furthermore, these tests allow only limited conclusions about clinch points under in-service loading. More purposefully, clinch points can be analyzed nondestructively by combining in-situ computed tomography (CT) and transient dynamic analysis (TDA). The TDA continuously measures the dynamic behavior of the specimen and indicates failure events like crack initiation, which then can be evaluated thoroughly by stopping the test and performing a CT scan. To qualify the TDA for this task, it is necessary to link the observed damage behavior with specific dynamic characteristics. In this work, the complementation of in-situ CT and TDA is investigated by testing a clinched single-lap tensile-shear specimen made of aluminum. The testing procedure is stepwise: at certain displacement levels, the specimen is investigated by in-situ CT and TDA. While the in-situ CT provides the location, extent, and development of the failure phenomena, the TDA uses this information to evaluate the dynamic signal and detect relevant frequency ranges, which indicate damage events. The results demonstrate, that failure initiation and progression can be analyzed efficiently by combining both measuring systems. The TDA reliably detects relevant signal changes in the monitored frequency band. By means of in-situ computed tomography, the corresponding failure phenomena can be described in detail, enhancing the understanding of the load-bearing and deformation behavior of clinch points. The concatenation of characteristic signal changes and observed failure phenomena can henceforth be transferred to analyze complex structures during operation nondestructively by TDA. ' author: - first_name: G full_name: Reschke, G last_name: Reschke - first_name: D full_name: Köhler, D last_name: Köhler - first_name: R full_name: Kupfer, R last_name: Kupfer - first_name: J full_name: Troschitz, J last_name: Troschitz - first_name: M full_name: Gude, M last_name: Gude - first_name: A full_name: Brosius, A last_name: Brosius citation: ama: 'Reschke G, Köhler D, Kupfer R, Troschitz J, Gude M, Brosius A. In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering. Published online 2024. doi:10.1177/09544089241251646' apa: 'Reschke, G., Köhler, D., Kupfer, R., Troschitz, J., Gude, M., & Brosius, A. (2024). In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering. https://doi.org/10.1177/09544089241251646' bibtex: '@article{Reschke_Köhler_Kupfer_Troschitz_Gude_Brosius_2024, title={In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points}, DOI={10.1177/09544089241251646}, journal={Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering}, publisher={SAGE Publications}, author={Reschke, G and Köhler, D and Kupfer, R and Troschitz, J and Gude, M and Brosius, A}, year={2024} }' chicago: 'Reschke, G, D Köhler, R Kupfer, J Troschitz, M Gude, and A Brosius. “In-Situ Computed Tomography and Transient Dynamic Analysis – Failure Analysis of a Single-Lap Tensile-Shear Test with Clinch Points.” Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2024. https://doi.org/10.1177/09544089241251646.' ieee: 'G. Reschke, D. Köhler, R. Kupfer, J. Troschitz, M. Gude, and A. Brosius, “In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points,” Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2024, doi: 10.1177/09544089241251646.' mla: 'Reschke, G., et al. “In-Situ Computed Tomography and Transient Dynamic Analysis – Failure Analysis of a Single-Lap Tensile-Shear Test with Clinch Points.” Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, SAGE Publications, 2024, doi:10.1177/09544089241251646.' short: 'G. Reschke, D. Köhler, R. Kupfer, J. Troschitz, M. Gude, A. Brosius, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering (2024).' date_created: 2025-06-02T20:03:39Z date_updated: 2025-06-02T20:18:31Z department: - _id: '157' - _id: '43' doi: 10.1177/09544089241251646 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: 'Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering' publication_identifier: issn: - 0954-4089 - 2041-3009 publication_status: published publisher: SAGE Publications status: public title: In-situ computed tomography and transient dynamic analysis – failure analysis of a single-lap tensile-shear test with clinch points type: journal_article user_id: '83408' year: '2024' ... --- _id: '60105' abstract: - lang: eng text: Lightweight design by using low-density and load-adapted materials can reduce the weight of vehicles and the emissions generated during operation. However, the usage of different materials requires innovative joining technologies with increased versatility. In this investigation, the focus is on describing and characterising the failure behaviour of connections manufactured by an innovative thermomechanical joining process with adaptable auxiliary joining elements in single-lap tensile-shear tests. In order to analyse the failure development in detail, the specimens are investigated using in-situ computed tomography (in-situ CT). Here, the tensile-shear test is interrupted at points of interest and CT scans are conducted under load. In addition, the interrupted in-situ testing procedure is validated by comparing the loading behaviour with conventional continuous tensile-shear tests. The results of the in-situ investigations of joints with varying material combinations clearly describe the cause of failure, allowing conclusions towards an improved joint design. author: - first_name: T full_name: Borgert, T last_name: Borgert - first_name: D full_name: Köhler, D last_name: Köhler - first_name: E. full_name: Wiens, E. last_name: Wiens - first_name: R full_name: Kupfer, R last_name: Kupfer - first_name: J full_name: Troschitz, J last_name: Troschitz - first_name: W full_name: Homberg, W last_name: Homberg - first_name: M full_name: Gude, M last_name: Gude citation: ama: 'Borgert T, Köhler D, Wiens E, et al. In-situ computed tomography analysis of the failure mechanisms of thermomechanically manufactured joints with auxiliary joining element. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. 2024;238(12):2299-2306. doi:10.1177/14644207241232233' apa: 'Borgert, T., Köhler, D., Wiens, E., Kupfer, R., Troschitz, J., Homberg, W., & Gude, M. (2024). In-situ computed tomography analysis of the failure mechanisms of thermomechanically manufactured joints with auxiliary joining element. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 238(12), 2299–2306. https://doi.org/10.1177/14644207241232233' bibtex: '@article{Borgert_Köhler_Wiens_Kupfer_Troschitz_Homberg_Gude_2024, title={In-situ computed tomography analysis of the failure mechanisms of thermomechanically manufactured joints with auxiliary joining element}, volume={238}, DOI={10.1177/14644207241232233}, number={12}, journal={Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications}, publisher={SAGE Publications}, author={Borgert, T and Köhler, D and Wiens, E. and Kupfer, R and Troschitz, J and Homberg, W and Gude, M}, year={2024}, pages={2299–2306} }' chicago: 'Borgert, T, D Köhler, E. Wiens, R Kupfer, J Troschitz, W Homberg, and M Gude. “In-Situ Computed Tomography Analysis of the Failure Mechanisms of Thermomechanically Manufactured Joints with Auxiliary Joining Element.” Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 238, no. 12 (2024): 2299–2306. https://doi.org/10.1177/14644207241232233.' ieee: 'T. Borgert et al., “In-situ computed tomography analysis of the failure mechanisms of thermomechanically manufactured joints with auxiliary joining element,” Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, vol. 238, no. 12, pp. 2299–2306, 2024, doi: 10.1177/14644207241232233.' mla: 'Borgert, T., et al. “In-Situ Computed Tomography Analysis of the Failure Mechanisms of Thermomechanically Manufactured Joints with Auxiliary Joining Element.” Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, vol. 238, no. 12, SAGE Publications, 2024, pp. 2299–306, doi:10.1177/14644207241232233.' short: 'T. Borgert, D. Köhler, E. Wiens, R. Kupfer, J. Troschitz, W. Homberg, M. Gude, Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 238 (2024) 2299–2306.' date_created: 2025-06-02T20:01:39Z date_updated: 2025-06-02T20:18:42Z ddc: - '620' department: - _id: '157' - _id: '43' doi: 10.1177/14644207241232233 has_accepted_license: '1' intvolume: ' 238' issue: '12' language: - iso: eng page: 2299-2306 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' - _id: '147' name: 'TRR 285 – C03: TRR 285 - Subproject C03' publication: 'Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications' publication_identifier: issn: - 1464-4207 - 2041-3076 publication_status: published publisher: SAGE Publications status: public title: In-situ computed tomography analysis of the failure mechanisms of thermomechanically manufactured joints with auxiliary joining element type: journal_article user_id: '83408' volume: 238 year: '2024' ... --- _id: '60107' abstract: - lang: eng text: Abstract. In lightweight constructions, clinching represents a cost-effective solution, in which joints are produced by local cold forming of the joining parts. Clinching phenomena are typically evaluated using destructive testing methods. While these methods influence the clinch point’s state, in-situ computed tomography (in-situ CT) is able to explore the clinching process with a specimen under load. Here, the path-controlled clinching process is interrupted at certain displacement levels and the specimen is scanned by CT while remaining in a stationary state. These interruptions are always accompanied by settling effects reducing the reaction force. Therefore, in this work, the influence of these interruptions on the force-displacement behavior during clinching and on the final clinch point’s geometric properties is investigated. author: - first_name: D. full_name: Köhler, D. last_name: Köhler - first_name: R. full_name: Kupfer, R. last_name: Kupfer - first_name: J. full_name: Troschitz, J. last_name: Troschitz - first_name: M. full_name: Gude, M. last_name: Gude citation: ama: 'Köhler D, Kupfer R, Troschitz J, Gude M. In-situ CT of the clinching process – Influence of settling effects due to process interruptions. In: Materials Research Proceedings. Vol 41. Materials Research Forum LLC; 2024. doi:10.21741/9781644903131-187' apa: Köhler, D., Kupfer, R., Troschitz, J., & Gude, M. (2024). In-situ CT of the clinching process – Influence of settling effects due to process interruptions. Materials Research Proceedings, 41. https://doi.org/10.21741/9781644903131-187 bibtex: '@inproceedings{Köhler_Kupfer_Troschitz_Gude_2024, title={In-situ CT of the clinching process – Influence of settling effects due to process interruptions}, volume={41}, DOI={10.21741/9781644903131-187}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Köhler, D. and Kupfer, R. and Troschitz, J. and Gude, M.}, year={2024} }' chicago: Köhler, D., R. Kupfer, J. Troschitz, and M. Gude. “In-Situ CT of the Clinching Process – Influence of Settling Effects Due to Process Interruptions.” In Materials Research Proceedings, Vol. 41. Materials Research Forum LLC, 2024. https://doi.org/10.21741/9781644903131-187. ieee: 'D. Köhler, R. Kupfer, J. Troschitz, and M. Gude, “In-situ CT of the clinching process – Influence of settling effects due to process interruptions,” in Materials Research Proceedings, 2024, vol. 41, doi: 10.21741/9781644903131-187.' mla: Köhler, D., et al. “In-Situ CT of the Clinching Process – Influence of Settling Effects Due to Process Interruptions.” Materials Research Proceedings, vol. 41, Materials Research Forum LLC, 2024, doi:10.21741/9781644903131-187. short: 'D. Köhler, R. Kupfer, J. Troschitz, M. Gude, in: Materials Research Proceedings, Materials Research Forum LLC, 2024.' date_created: 2025-06-02T20:04:17Z date_updated: 2025-06-02T20:18:11Z department: - _id: '157' - _id: '43' doi: 10.21741/9781644903131-187 intvolume: ' 41' 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 CT of the clinching process – Influence of settling effects due to process interruptions type: conference user_id: '83408' volume: 41 year: '2024' ... --- _id: '61766' 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. Transiente Dynamische Analyse – Vergleich zeit- und frequenzdiskreter Auswertemethoden anhand geclinchter Aluminiumverbindungen. In: Krupp U, Steller I, eds. Werkstoffe und Bauteile auf dem Prüfstand. Stahlinstitut VDEh; 2024.' apa: Reschke, G., & Brosius, A. (2024). Transiente Dynamische Analyse – Vergleich zeit- und frequenzdiskreter Auswertemethoden anhand geclinchter Aluminiumverbindungen. In U. Krupp & I. Steller (Eds.), Werkstoffe und Bauteile auf dem Prüfstand. Stahlinstitut VDEh. bibtex: '@inproceedings{Reschke_Brosius_2024, place={Düsseldorf}, title={Transiente Dynamische Analyse – Vergleich zeit- und frequenzdiskreter Auswertemethoden anhand geclinchter Aluminiumverbindungen}, booktitle={Werkstoffe und Bauteile auf dem Prüfstand}, publisher={Stahlinstitut VDEh}, author={Reschke, Gregor and Brosius, Alexander}, editor={Krupp, Ulrich and Steller, Ingo}, year={2024} }' chicago: 'Reschke, Gregor, and Alexander Brosius. “Transiente Dynamische Analyse – Vergleich zeit- und frequenzdiskreter Auswertemethoden anhand geclinchter Aluminiumverbindungen.” In Werkstoffe und Bauteile auf dem Prüfstand, edited by Ulrich Krupp and Ingo Steller. Düsseldorf: Stahlinstitut VDEh, 2024.' ieee: G. Reschke and A. Brosius, “Transiente Dynamische Analyse – Vergleich zeit- und frequenzdiskreter Auswertemethoden anhand geclinchter Aluminiumverbindungen,” in Werkstoffe und Bauteile auf dem Prüfstand, Krefeld, 2024. mla: Reschke, Gregor, and Alexander Brosius. “Transiente Dynamische Analyse – Vergleich zeit- und frequenzdiskreter Auswertemethoden anhand geclinchter Aluminiumverbindungen.” Werkstoffe und Bauteile auf dem Prüfstand, edited by Ulrich Krupp and Ingo Steller, Stahlinstitut VDEh, 2024. short: 'G. Reschke, A. Brosius, in: U. Krupp, I. Steller (Eds.), Werkstoffe und Bauteile auf dem Prüfstand, Stahlinstitut VDEh, Düsseldorf, 2024.' conference: end_date: 2024-12-06 location: Krefeld name: 42. Vortrags- und Diskussionstagung Werkstoffprüfung 2024 start_date: 2024-12-05 date_created: 2025-10-09T06:24:40Z date_updated: 2025-10-09T06:32:46Z department: - _id: '43' editor: - first_name: Ulrich full_name: Krupp, Ulrich last_name: Krupp - first_name: Ingo full_name: Steller, Ingo last_name: Steller language: - iso: ger place: Düsseldorf project: - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '133' name: TRR 285 - Project Area C - _id: '148' name: TRR 285 - Subproject C04 publication: Werkstoffe und Bauteile auf dem Prüfstand publication_identifier: isbn: - 978-3-941269-97-2 publication_status: published publisher: Stahlinstitut VDEh quality_controlled: '1' status: public title: Transiente Dynamische Analyse – Vergleich zeit- und frequenzdiskreter Auswertemethoden anhand geclinchter Aluminiumverbindungen type: conference user_id: '98812' year: '2024' ... --- _id: '38509' author: - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius - first_name: Lars full_name: Ewenz, Lars last_name: Ewenz - first_name: Richard full_name: Stephan, Richard last_name: Stephan - first_name: Martina full_name: Zimmermann, Martina last_name: Zimmermann citation: ama: 'Brosius A, Ewenz L, Stephan R, Zimmermann M. Anrisserkennung an geclinchten Proben während einer zyklischen Belastung unter Nutzung eines Scanning Laser Doppler Vibrometers. In: Zimmermann M, ed. Tagung Werkstoffprüfung 2022. Deutsche Gesellschaft für Materialkunde e.V. (DGM); 2023.' apa: Brosius, A., Ewenz, L., Stephan, R., & Zimmermann, M. (2023). Anrisserkennung an geclinchten Proben während einer zyklischen Belastung unter Nutzung eines Scanning Laser Doppler Vibrometers. In M. Zimmermann (Ed.), Tagung Werkstoffprüfung 2022. Deutsche Gesellschaft für Materialkunde e.V. (DGM). bibtex: '@inproceedings{Brosius_Ewenz_Stephan_Zimmermann_2023, title={Anrisserkennung an geclinchten Proben während einer zyklischen Belastung unter Nutzung eines Scanning Laser Doppler Vibrometers}, booktitle={Tagung Werkstoffprüfung 2022}, publisher={Deutsche Gesellschaft für Materialkunde e.V. (DGM)}, author={Brosius, Alexander and Ewenz, Lars and Stephan, Richard and Zimmermann, Martina}, editor={Zimmermann, Martina}, year={2023} }' chicago: Brosius, Alexander, Lars Ewenz, Richard Stephan, and Martina Zimmermann. “Anrisserkennung an Geclinchten Proben Während Einer Zyklischen Belastung Unter Nutzung Eines Scanning Laser Doppler Vibrometers.” In Tagung Werkstoffprüfung 2022, edited by Martina Zimmermann. Deutsche Gesellschaft für Materialkunde e.V. (DGM), 2023. ieee: A. Brosius, L. Ewenz, R. Stephan, and M. Zimmermann, “Anrisserkennung an geclinchten Proben während einer zyklischen Belastung unter Nutzung eines Scanning Laser Doppler Vibrometers,” in Tagung Werkstoffprüfung 2022, Dresden, 2023. mla: Brosius, Alexander, et al. “Anrisserkennung an Geclinchten Proben Während Einer Zyklischen Belastung Unter Nutzung Eines Scanning Laser Doppler Vibrometers.” Tagung Werkstoffprüfung 2022, edited by Martina Zimmermann, Deutsche Gesellschaft für Materialkunde e.V. (DGM), 2023. short: 'A. Brosius, L. Ewenz, R. Stephan, M. Zimmermann, in: M. Zimmermann (Ed.), Tagung Werkstoffprüfung 2022, Deutsche Gesellschaft für Materialkunde e.V. (DGM), 2023.' conference: location: Dresden name: Tagung Werkstoffprüfung 2022 date_created: 2023-01-23T19:41:13Z date_updated: 2023-01-23T19:53:24Z department: - _id: '630' editor: - first_name: Martina full_name: Zimmermann, Martina last_name: Zimmermann language: - iso: eng project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '132' name: 'TRR 285 - B: TRR 285 - Project Area B' - _id: '141' name: 'TRR 285 – B02: TRR 285 - Subproject B02' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: Tagung Werkstoffprüfung 2022 publication_identifier: isbn: - 978-3-88355-430-3 publisher: Deutsche Gesellschaft für Materialkunde e.V. (DGM) status: public title: Anrisserkennung an geclinchten Proben während einer zyklischen Belastung unter Nutzung eines Scanning Laser Doppler Vibrometers type: conference user_id: '7850' year: '2023' ... --- _id: '58350' 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. Investigations on Continuous Transient Dynamic Analysis of Clinched Aluminum Sheets. In: Lecture Notes in Production Engineering. Springer Nature Switzerland; 2023. doi:10.1007/978-3-031-47394-4_8' apa: Reschke, G., & Brosius, A. (2023). Investigations on Continuous Transient Dynamic Analysis of Clinched Aluminum Sheets. In Lecture Notes in Production Engineering. Springer Nature Switzerland. https://doi.org/10.1007/978-3-031-47394-4_8 bibtex: '@inbook{Reschke_Brosius_2023, place={Cham}, title={Investigations on Continuous Transient Dynamic Analysis of Clinched Aluminum Sheets}, DOI={10.1007/978-3-031-47394-4_8}, booktitle={Lecture Notes in Production Engineering}, publisher={Springer Nature Switzerland}, author={Reschke, Gregor and Brosius, Alexander}, year={2023} }' chicago: 'Reschke, Gregor, and Alexander Brosius. “Investigations on Continuous Transient Dynamic Analysis of Clinched Aluminum Sheets.” In Lecture Notes in Production Engineering. Cham: Springer Nature Switzerland, 2023. https://doi.org/10.1007/978-3-031-47394-4_8.' ieee: 'G. Reschke and A. Brosius, “Investigations on Continuous Transient Dynamic Analysis of Clinched Aluminum Sheets,” in Lecture Notes in Production Engineering, Cham: Springer Nature Switzerland, 2023.' mla: Reschke, Gregor, and Alexander Brosius. “Investigations on Continuous Transient Dynamic Analysis of Clinched Aluminum Sheets.” Lecture Notes in Production Engineering, Springer Nature Switzerland, 2023, doi:10.1007/978-3-031-47394-4_8. short: 'G. Reschke, A. Brosius, in: Lecture Notes in Production Engineering, Springer Nature Switzerland, Cham, 2023.' date_created: 2025-01-23T19:30:39Z date_updated: 2025-01-23T19:32:00Z department: - _id: '43' - _id: '157' doi: 10.1007/978-3-031-47394-4_8 language: - iso: eng place: Cham 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: Lecture Notes in Production Engineering publication_identifier: isbn: - '9783031473937' - '9783031473944' issn: - 2194-0525 - 2194-0533 publication_status: published publisher: Springer Nature Switzerland status: public title: Investigations on Continuous Transient Dynamic Analysis of Clinched Aluminum Sheets type: book_chapter user_id: '98812' year: '2023' ... --- _id: '51190' abstract: - lang: eng text: Abstract. Force-displacement measurements and macrosections are commonly used methods to validate numerical models of clinching processes. However, these ex-situ methods often lead to springback of elastic deformations and crack-closing after unloading. In contrast, the in-situ computed tomography (CT) can provide three-dimensional images of the clinching point under loading conditions. So far, the quantity of elastic springback that causes measuring deviations between in- and ex-situ measurements is not determined. In this paper, a method is described to quantitatively compare the results of in-situ CT, ex-situ CT and CT scans of cut specimens, which are prepared for macrosectioning, among each other. The method is applied to a single-lap shear test of two clinched aluminum sheets. Here, the test is conducted to specific process steps, then the specimen is CT scanned in-situ (during loading) and ex-situ (after unloading). Subsequently, the specimens are cut for macrosectioning and CT scanned. Finally, the outer contours and the interfaces of cross section images are determined by digital image analysis and the deviations over the clinching point between ex- and in-situ methods are calculated. author: - first_name: Daniel full_name: Köhler, Daniel last_name: Köhler - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Maik full_name: Gude, Maik last_name: Gude citation: ama: 'Köhler D, Kupfer R, Troschitz J, Gude M. Comparison of ex- and in-situ investigations of clinched single-lap shear specimens. In: Materials Research Proceedings. Materials Research Forum LLC; 2023. doi:10.21741/9781644902417-20' apa: Köhler, D., Kupfer, R., Troschitz, J., & Gude, M. (2023). Comparison of ex- and in-situ investigations of clinched single-lap shear specimens. Materials Research Proceedings. https://doi.org/10.21741/9781644902417-20 bibtex: '@inproceedings{Köhler_Kupfer_Troschitz_Gude_2023, title={Comparison of ex- and in-situ investigations of clinched single-lap shear specimens}, DOI={10.21741/9781644902417-20}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik}, year={2023} }' chicago: Köhler, Daniel, Robert Kupfer, Juliane Troschitz, and Maik Gude. “Comparison of Ex- and in-Situ Investigations of Clinched Single-Lap Shear Specimens.” In Materials Research Proceedings. Materials Research Forum LLC, 2023. https://doi.org/10.21741/9781644902417-20. ieee: 'D. Köhler, R. Kupfer, J. Troschitz, and M. Gude, “Comparison of ex- and in-situ investigations of clinched single-lap shear specimens,” 2023, doi: 10.21741/9781644902417-20.' mla: Köhler, Daniel, et al. “Comparison of Ex- and in-Situ Investigations of Clinched Single-Lap Shear Specimens.” Materials Research Proceedings, Materials Research Forum LLC, 2023, doi:10.21741/9781644902417-20. short: 'D. Köhler, R. Kupfer, J. Troschitz, M. Gude, in: Materials Research Proceedings, Materials Research Forum LLC, 2023.' date_created: 2024-02-06T14:48:44Z date_updated: 2025-06-02T20:18:56Z department: - _id: '157' - _id: '43' doi: 10.21741/9781644902417-20 language: - iso: eng project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _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: Comparison of ex- and in-situ investigations of clinched single-lap shear specimens type: conference user_id: '83408' year: '2023' ... --- _id: '51194' author: - first_name: Daniel full_name: Köhler, Daniel last_name: Köhler - first_name: Richard full_name: Stephan, Richard last_name: Stephan - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius - first_name: Maik full_name: Gude, Maik last_name: Gude citation: ama: 'Köhler D, Stephan R, Kupfer R, Troschitz J, Brosius A, Gude M. In-situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point. In: Lecture Notes in Production Engineering. Springer International Publishing; 2023. doi:10.1007/978-3-031-18318-8_28' apa: Köhler, D., Stephan, R., Kupfer, R., Troschitz, J., Brosius, A., & Gude, M. (2023). In-situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point. In Lecture Notes in Production Engineering. Springer International Publishing. https://doi.org/10.1007/978-3-031-18318-8_28 bibtex: '@inbook{Köhler_Stephan_Kupfer_Troschitz_Brosius_Gude_2023, place={Cham}, title={In-situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point}, DOI={10.1007/978-3-031-18318-8_28}, booktitle={Lecture Notes in Production Engineering}, publisher={Springer International Publishing}, author={Köhler, Daniel and Stephan, Richard and Kupfer, Robert and Troschitz, Juliane and Brosius, Alexander and Gude, Maik}, year={2023} }' chicago: 'Köhler, Daniel, Richard Stephan, Robert Kupfer, Juliane Troschitz, Alexander Brosius, and Maik Gude. “In-Situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point.” In Lecture Notes in Production Engineering. Cham: Springer International Publishing, 2023. https://doi.org/10.1007/978-3-031-18318-8_28.' ieee: 'D. Köhler, R. Stephan, R. Kupfer, J. Troschitz, A. Brosius, and M. Gude, “In-situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point,” in Lecture Notes in Production Engineering, Cham: Springer International Publishing, 2023.' mla: Köhler, Daniel, et al. “In-Situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point.” Lecture Notes in Production Engineering, Springer International Publishing, 2023, doi:10.1007/978-3-031-18318-8_28. short: 'D. Köhler, R. Stephan, R. Kupfer, J. Troschitz, A. Brosius, M. Gude, in: Lecture Notes in Production Engineering, Springer International Publishing, Cham, 2023.' date_created: 2024-02-06T15:03:03Z date_updated: 2025-06-02T20:19:17Z department: - _id: '157' - _id: '43' doi: 10.1007/978-3-031-18318-8_28 language: - iso: eng place: Cham project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: Lecture Notes in Production Engineering publication_identifier: isbn: - '9783031183171' - '9783031183188' issn: - 2194-0525 - 2194-0533 publication_status: published publisher: Springer International Publishing status: public title: In-situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point type: book_chapter user_id: '83408' year: '2023' ... --- _id: '34212' abstract: - lang: eng text: "Force–displacement measurements and micrograph analyses are commonly used methods to validate numerical models of clinching processes. However, these methods often lead to resetting of elastic deformations and crack-\r\nclosing after unloading. In contrast, the in situ computed tomography (CT) can provide three-dimensional images of the clinch point under loading conditions. In this paper, the potential of the in situ investigation of a clinching process as validation method is analyzed. For the in situ testing, a tailored test set-up featuring a beryllium cylinder for load-bearing and clinching tools made from ultra-high-strength titanium and Si3N4 are used. In the experiments, the clinching of two aluminum sheets is interrupted at specific process steps in order to perform the CT scans. It is shown that in situ CT visualizes the inner geometry of the joint at high precision and that this method is suitable to validate numerical models." author: - first_name: Daniel full_name: Köhler, Daniel last_name: Köhler - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Maik full_name: Gude, Maik last_name: Gude citation: ama: 'Köhler D, Kupfer R, Troschitz J, Gude M. Clinching in In Situ CT—A Novel Validation Method for Mechanical Joining Processes. In: The Minerals, Metals & Materials Series. Springer International Publishing; 2022. doi:10.1007/978-3-031-06212-4_75' apa: Köhler, D., Kupfer, R., Troschitz, J., & Gude, M. (2022). Clinching in In Situ CT—A Novel Validation Method for Mechanical Joining Processes. In The Minerals, Metals & Materials Series. Springer International Publishing. https://doi.org/10.1007/978-3-031-06212-4_75 bibtex: '@inbook{Köhler_Kupfer_Troschitz_Gude_2022, place={Cham}, title={Clinching in In Situ CT—A Novel Validation Method for Mechanical Joining Processes}, DOI={10.1007/978-3-031-06212-4_75}, booktitle={The Minerals, Metals & Materials Series}, publisher={Springer International Publishing}, author={Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik}, year={2022} }' chicago: 'Köhler, Daniel, Robert Kupfer, Juliane Troschitz, and Maik Gude. “Clinching in In Situ CT—A Novel Validation Method for Mechanical Joining Processes.” In The Minerals, Metals & Materials Series. Cham: Springer International Publishing, 2022. https://doi.org/10.1007/978-3-031-06212-4_75.' ieee: 'D. Köhler, R. Kupfer, J. Troschitz, and M. Gude, “Clinching in In Situ CT—A Novel Validation Method for Mechanical Joining Processes,” in The Minerals, Metals & Materials Series, Cham: Springer International Publishing, 2022.' mla: Köhler, Daniel, et al. “Clinching in In Situ CT—A Novel Validation Method for Mechanical Joining Processes.” The Minerals, Metals & Materials Series, Springer International Publishing, 2022, doi:10.1007/978-3-031-06212-4_75. short: 'D. Köhler, R. Kupfer, J. Troschitz, M. Gude, in: The Minerals, Metals & Materials Series, Springer International Publishing, Cham, 2022.' date_created: 2022-12-05T21:06:21Z date_updated: 2022-12-05T21:11:47Z doi: 10.1007/978-3-031-06212-4_75 keyword: - Clinching - Non-destructive testing - Computed tomography - In situ CT language: - iso: eng place: Cham project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: The Minerals, Metals & Materials Series publication_identifier: isbn: - '9783031062117' - '9783031062124' issn: - 2367-1181 - 2367-1696 publication_status: published publisher: Springer International Publishing status: public title: Clinching in In Situ CT—A Novel Validation Method for Mechanical Joining Processes type: book_chapter user_id: '7850' year: '2022' ... --- _id: '34225' abstract: - lang: eng text: 'Thermoplastic composites (TPCs) are predestined for use in lightweight structures, especially for high-volume applications. In many cases, joining is a key factor for the successful application of TPCs in multi-material systems. Many joining processes for this material group are based on warm forming the joining zone. This results in a change of the local material structure characterised by modified fibre paths, as well as varying fibre contents, which significantly influences the load-bearing behaviour. During the forming process, many different phenomena occur simultaneously at different scales. In this paper, the deformation modes and flow mechanisms of TPCs during forming described in the literature are first analysed. Based on this, three different joining processes are investigated: embedding of inserts, moulding of contour joints, and hotclinching. In order to identify the phenomena occurring in each process and to describe the characteristic resulting material structure in the joining zones, micrographs as well as computed tomography (CT) analyses are performed for both individual process stages and final joining zones.' article_number: '5454' author: - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Benjamin full_name: Gröger, Benjamin last_name: Gröger - first_name: Veit full_name: Würfel, Veit last_name: Würfel - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer - first_name: Maik full_name: Gude, Maik last_name: Gude citation: ama: 'Troschitz J, Gröger B, Würfel V, Kupfer R, Gude M. Joining Processes for Fibre-Reinforced Thermoplastics: Phenomena and Characterisation. Materials. 2022;15(15). doi:10.3390/ma15155454' apa: 'Troschitz, J., Gröger, B., Würfel, V., Kupfer, R., & Gude, M. (2022). Joining Processes for Fibre-Reinforced Thermoplastics: Phenomena and Characterisation. Materials, 15(15), Article 5454. https://doi.org/10.3390/ma15155454' bibtex: '@article{Troschitz_Gröger_Würfel_Kupfer_Gude_2022, title={Joining Processes for Fibre-Reinforced Thermoplastics: Phenomena and Characterisation}, volume={15}, DOI={10.3390/ma15155454}, number={155454}, journal={Materials}, publisher={MDPI AG}, author={Troschitz, Juliane and Gröger, Benjamin and Würfel, Veit and Kupfer, Robert and Gude, Maik}, year={2022} }' chicago: 'Troschitz, Juliane, Benjamin Gröger, Veit Würfel, Robert Kupfer, and Maik Gude. “Joining Processes for Fibre-Reinforced Thermoplastics: Phenomena and Characterisation.” Materials 15, no. 15 (2022). https://doi.org/10.3390/ma15155454.' ieee: 'J. Troschitz, B. Gröger, V. Würfel, R. Kupfer, and M. Gude, “Joining Processes for Fibre-Reinforced Thermoplastics: Phenomena and Characterisation,” Materials, vol. 15, no. 15, Art. no. 5454, 2022, doi: 10.3390/ma15155454.' mla: 'Troschitz, Juliane, et al. “Joining Processes for Fibre-Reinforced Thermoplastics: Phenomena and Characterisation.” Materials, vol. 15, no. 15, 5454, MDPI AG, 2022, doi:10.3390/ma15155454.' short: J. Troschitz, B. Gröger, V. Würfel, R. Kupfer, M. Gude, Materials 15 (2022). date_created: 2022-12-05T21:51:47Z date_updated: 2022-12-05T21:54:09Z doi: 10.3390/ma15155454 intvolume: ' 15' issue: '15' language: - iso: eng project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '131' name: 'TRR 285 - A: TRR 285 - Project Area A' - _id: '137' name: 'TRR 285 – A03: TRR 285 - Subproject A03' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: Materials publication_identifier: issn: - 1996-1944 publication_status: published publisher: MDPI AG status: public title: 'Joining Processes for Fibre-Reinforced Thermoplastics: Phenomena and Characterisation' type: journal_article user_id: '7850' volume: 15 year: '2022' ... --- _id: '30626' abstract: - lang: eng text: Clinching is a very cost-efficient method for joining two or more sheets made of identical or different materials. However, the current evaluation methods cannot confirm the critical geometrical features of joints such as neck thickness, undercut, and bottom thickness. Furthermore, the effects caused by joining process such as elastic deformation and crack-closure are significant for the joining quality, but often earn insufficient attention. Therefore, computed tomography (CT) and Transient Dynamic Analysis (TDA) as an ultrasonic testing and evaluation procedure are combined to overcome the obstacles mentioned above. In order to have a well-defined and reproducible typical geometrical error in clinching, specimens with a pre-specified lateral offset of the punch with 0.1 mm, 0.2 mm are as well as with no lateral offset are investigated using CT. The specimens are treated with conductive copper varnish in varying intensities to support the two sheets' distinguishability in the CT measurement. The subsequently extracted surfaces from CT-scan data are used to create three-dimensional models for a numerical Transient Dynamic Analysis. Hereby, a harmonic force is applied to one sheet and the transferred energy is determined at the opposite side of the clinch point on the other sheet. The transmitted energy can be used as a quantitative measure for the joining quality. This setup is simulated by means of Finite-Element-Method and the specimens are investigated experimentally using a piezo actuator and a piezo sensor. The novelty of the results presented here is the completely non-destructive investigation of joint specimen by CT of similar materials with a contrast given foil in between the sheets and the subsequent TDA, which can easily detect difference between the specimens by evaluation of the energy dissipation of the joints. author: - first_name: D. full_name: Köhler, D. last_name: Köhler - first_name: B. full_name: Sadeghian, B. last_name: Sadeghian - 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 - first_name: A. full_name: Brosius, A. last_name: Brosius citation: ama: Köhler D, Sadeghian B, Troschitz J, Kupfer R, Gude M, Brosius A. Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis. Journal of Advanced Joining Processes. 2022;5:100089. doi:10.1016/j.jajp.2021.100089 apa: Köhler, D., Sadeghian, B., Troschitz, J., Kupfer, R., Gude, M., & Brosius, A. (2022). Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis. Journal of Advanced Joining Processes, 5, 100089. https://doi.org/10.1016/j.jajp.2021.100089 bibtex: '@article{Köhler_Sadeghian_Troschitz_Kupfer_Gude_Brosius_2022, title={Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis}, volume={5}, DOI={10.1016/j.jajp.2021.100089}, journal={Journal of Advanced Joining Processes}, author={Köhler, D. and Sadeghian, B. and Troschitz, J. and Kupfer, R. and Gude, M. and Brosius, A.}, year={2022}, pages={100089} }' chicago: 'Köhler, D., B. Sadeghian, J. Troschitz, R. Kupfer, M. Gude, and A. Brosius. “Characterisation of Lateral Offsets in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Journal of Advanced Joining Processes 5 (2022): 100089. https://doi.org/10.1016/j.jajp.2021.100089.' ieee: 'D. Köhler, B. Sadeghian, J. Troschitz, R. Kupfer, M. Gude, and A. Brosius, “Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis,” Journal of Advanced Joining Processes, vol. 5, p. 100089, 2022, doi: 10.1016/j.jajp.2021.100089.' mla: Köhler, D., et al. “Characterisation of Lateral Offsets in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Journal of Advanced Joining Processes, vol. 5, 2022, p. 100089, doi:10.1016/j.jajp.2021.100089. short: D. Köhler, B. Sadeghian, J. Troschitz, R. Kupfer, M. Gude, A. Brosius, Journal of Advanced Joining Processes 5 (2022) 100089. date_created: 2022-03-28T10:27:42Z date_updated: 2023-01-02T10:54:44Z department: - _id: '630' doi: 10.1016/j.jajp.2021.100089 intvolume: ' 5' language: - iso: eng page: '100089' project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: Journal of Advanced Joining Processes status: public title: Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis type: journal_article user_id: '14931' volume: 5 year: '2022' ... --- _id: '34280' abstract: - lang: eng text: Clinching is a cost efficient method for joining components in series production. To assure the clinch point’s quality, the force displacement curve during clinching or the bottom thickness are monitored. The most significant geometrical characteristics of the clinch point, neck thickness and undercut, are usually tested destructively by microsectioning. However, micrograph preparation goes ahead with a resetting of elastic deformations and crack-closing after unloading. To generate a comprehensive knowledge of the clinch point’s inner geometry under load, in-situ computed tomography (CT) and acoustic testing (TDA) can be combined. While the TDA is highly sensitive to the inner state of the clinch point, it could detect critical events like crack development during loading. If such events are indicated, the loading process is stopped and a stepped in-situ CT of the following crack and deformation development is performed. In this paper, the concept is applied to the process of clinching itself, providing a detailed three-dimensional insight in the development of the joining zone. A test set-up is used which allows a stepwise clinching of two aluminium sheets EN AW 6014. Furthermore, this set-up is positioned within a CT system. In order to minimize X-ray absorption, a beryllium cylinder is used within the set-up frame and clinching tools are made from Si3N4. The actuator and sensor necessary for the TDA are integrated in the set-up. In regular process steps, the clinching process is interrupted in order to perform a TDA and a CT scan. In order to enhance the visibility of the interface, a thin tin layer is positioned between the sheets prior clinching. It is shown, that the test-set up allows a monitoring of the dynamic behaviour of the specimen during clinching while the CT scans visualize the inner geometry and material flow non-destructively. author: - first_name: Daniel full_name: Köhler, Daniel last_name: Köhler - first_name: Richard full_name: Stephan, Richard last_name: Stephan - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius - first_name: Maik full_name: Gude, Maik last_name: Gude citation: ama: 'Köhler D, Stephan R, Kupfer R, Troschitz J, Brosius A, Gude M. Investigations on Combined in situ CT and Acoustic Analysis during Clinching. In: Key Engineering Materials. Vol 926. Trans Tech Publications, Ltd.; 2022:1489-1497. doi:10.4028/p-32330d' apa: Köhler, D., Stephan, R., Kupfer, R., Troschitz, J., Brosius, A., & Gude, M. (2022). Investigations on Combined in situ CT and Acoustic Analysis during Clinching. Key Engineering Materials, 926, 1489–1497. https://doi.org/10.4028/p-32330d bibtex: '@inproceedings{Köhler_Stephan_Kupfer_Troschitz_Brosius_Gude_2022, title={Investigations on Combined in situ CT and Acoustic Analysis during Clinching}, volume={926}, DOI={10.4028/p-32330d}, booktitle={Key Engineering Materials}, publisher={Trans Tech Publications, Ltd.}, author={Köhler, Daniel and Stephan, Richard and Kupfer, Robert and Troschitz, Juliane and Brosius, Alexander and Gude, Maik}, year={2022}, pages={1489–1497} }' chicago: Köhler, Daniel, Richard Stephan, Robert Kupfer, Juliane Troschitz, Alexander Brosius, and Maik Gude. “Investigations on Combined in Situ CT and Acoustic Analysis during Clinching.” In Key Engineering Materials, 926:1489–97. Trans Tech Publications, Ltd., 2022. https://doi.org/10.4028/p-32330d. ieee: 'D. Köhler, R. Stephan, R. Kupfer, J. Troschitz, A. Brosius, and M. Gude, “Investigations on Combined in situ CT and Acoustic Analysis during Clinching,” in Key Engineering Materials, 2022, vol. 926, pp. 1489–1497, doi: 10.4028/p-32330d.' mla: Köhler, Daniel, et al. “Investigations on Combined in Situ CT and Acoustic Analysis during Clinching.” Key Engineering Materials, vol. 926, Trans Tech Publications, Ltd., 2022, pp. 1489–97, doi:10.4028/p-32330d. short: 'D. Köhler, R. Stephan, R. Kupfer, J. Troschitz, A. Brosius, M. Gude, in: Key Engineering Materials, Trans Tech Publications, Ltd., 2022, pp. 1489–1497.' date_created: 2022-12-07T16:38:44Z date_updated: 2023-01-02T11:13:59Z department: - _id: '630' doi: 10.4028/p-32330d intvolume: ' 926' keyword: - Mechanical Engineering - Mechanics of Materials - General Materials Science language: - iso: eng page: 1489-1497 project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: Key Engineering Materials publication_identifier: issn: - 1662-9795 publication_status: published publisher: Trans Tech Publications, Ltd. status: public title: Investigations on Combined in situ CT and Acoustic Analysis during Clinching type: conference user_id: '14931' volume: 926 year: '2022' ... --- _id: '36462' abstract: - lang: eng text: The conduction of structure-borne sound through joints causes energy dissipation. The sound reduction index describes this energy loss as a level decrease in the particle velocity across series-connected damping elements for which the superposition principle applies. This simple model can help to develop a testing method for joints based on this characteristic energy loss. In this paper, this model is experimentally evaluated for multiple in-series clinched aluminium sheets. Samples connected by several clinch points arranged in parallel are investigated experimentally, and the results are discussed. author: - first_name: Richard full_name: Stephan, Richard last_name: Stephan - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius citation: ama: 'Stephan R, Brosius A. Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets. In: The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT. MDPI; 2022. doi:10.3390/engproc2022026025' apa: Stephan, R., & Brosius, A. (2022). Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets. The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT. https://doi.org/10.3390/engproc2022026025 bibtex: '@inproceedings{Stephan_Brosius_2022, title={Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets}, DOI={10.3390/engproc2022026025}, booktitle={The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT}, publisher={MDPI}, author={Stephan, Richard and Brosius, Alexander}, year={2022} }' chicago: Stephan, Richard, and Alexander Brosius. “Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets.” In The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT. MDPI, 2022. https://doi.org/10.3390/engproc2022026025. ieee: 'R. Stephan and A. Brosius, “Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets,” 2022, doi: 10.3390/engproc2022026025.' mla: Stephan, Richard, and Alexander Brosius. “Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets.” The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT, MDPI, 2022, doi:10.3390/engproc2022026025. short: 'R. Stephan, A. Brosius, in: The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT, MDPI, 2022.' date_created: 2023-01-12T13:55:07Z date_updated: 2023-01-12T13:58:49Z department: - _id: '630' doi: 10.3390/engproc2022026025 keyword: - clinching - mechanical joining - damping - model - evaluation - dynamics language: - iso: eng main_file_link: - open_access: '1' url: https://www.mdpi.com/2673-4591/26/1/25 oa: '1' project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT publication_status: published publisher: MDPI status: public title: Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets type: conference user_id: '7850' year: '2022' ...