--- _id: '30696' author: - first_name: C. full_name: Zirngibl, C. last_name: Zirngibl - first_name: B. full_name: Schleich, B. last_name: Schleich - first_name: S. full_name: Wartzack, S. last_name: Wartzack citation: ama: Zirngibl C, Schleich B, Wartzack S. Approach for the automated and data-based design of mechanical joints. Proceedings of the Design Society. 2021;1:521. doi:10.1017/pds.2021.52 apa: Zirngibl, C., Schleich, B., & Wartzack, S. (2021). Approach for the automated and data-based design of mechanical joints. Proceedings of the Design Society, 1, 521. https://doi.org/10.1017/pds.2021.52 bibtex: '@article{Zirngibl_Schleich_Wartzack_2021, title={Approach for the automated and data-based design of mechanical joints}, volume={1}, DOI={10.1017/pds.2021.52}, journal={Proceedings of the Design Society}, author={Zirngibl, C. and Schleich, B. and Wartzack, S.}, year={2021}, pages={521} }' chicago: 'Zirngibl, C., B. Schleich, and S. Wartzack. “Approach for the Automated and Data-Based Design of Mechanical Joints.” Proceedings of the Design Society 1 (2021): 521. https://doi.org/10.1017/pds.2021.52.' ieee: 'C. Zirngibl, B. Schleich, and S. Wartzack, “Approach for the automated and data-based design of mechanical joints,” Proceedings of the Design Society, vol. 1, p. 521, 2021, doi: 10.1017/pds.2021.52.' mla: Zirngibl, C., et al. “Approach for the Automated and Data-Based Design of Mechanical Joints.” Proceedings of the Design Society, vol. 1, 2021, p. 521, doi:10.1017/pds.2021.52. short: C. Zirngibl, B. Schleich, S. Wartzack, Proceedings of the Design Society 1 (2021) 521. date_created: 2022-03-29T09:12:58Z date_updated: 2023-01-02T11:19:35Z department: - _id: '630' doi: 10.1017/pds.2021.52 intvolume: ' 1' language: - iso: eng page: '521' project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '132' name: 'TRR 285 - B: TRR 285 - Project Area B' - _id: '144' name: 'TRR 285 – B05: TRR 285 - Subproject B05' publication: Proceedings of the Design Society status: public title: Approach for the automated and data-based design of mechanical joints type: journal_article user_id: '14931' volume: 1 year: '2021' ... --- _id: '30700' author: - first_name: C. full_name: Zirngibl, C. last_name: Zirngibl - first_name: F. full_name: Dworschak, F. last_name: Dworschak - first_name: B. full_name: Schleich, B. last_name: Schleich - first_name: S. full_name: Wartzack, S. last_name: Wartzack citation: ama: Zirngibl C, Dworschak F, Schleich B, Wartzack S. Application of reinforcement learning for the optimization of clinch joint characteristics. Production Engineering. Published online 2021. doi:10.1007/s11740-021-01098-4 apa: Zirngibl, C., Dworschak, F., Schleich, B., & Wartzack, S. (2021). Application of reinforcement learning for the optimization of clinch joint characteristics. Production Engineering. https://doi.org/10.1007/s11740-021-01098-4 bibtex: '@article{Zirngibl_Dworschak_Schleich_Wartzack_2021, title={Application of reinforcement learning for the optimization of clinch joint characteristics}, DOI={10.1007/s11740-021-01098-4}, journal={Production Engineering}, author={Zirngibl, C. and Dworschak, F. and Schleich, B. and Wartzack, S.}, year={2021} }' chicago: Zirngibl, C., F. Dworschak, B. Schleich, and S. Wartzack. “Application of Reinforcement Learning for the Optimization of Clinch Joint Characteristics.” Production Engineering, 2021. https://doi.org/10.1007/s11740-021-01098-4. ieee: 'C. Zirngibl, F. Dworschak, B. Schleich, and S. Wartzack, “Application of reinforcement learning for the optimization of clinch joint characteristics,” Production Engineering, 2021, doi: 10.1007/s11740-021-01098-4.' mla: Zirngibl, C., et al. “Application of Reinforcement Learning for the Optimization of Clinch Joint Characteristics.” Production Engineering, 2021, doi:10.1007/s11740-021-01098-4. short: C. Zirngibl, F. Dworschak, B. Schleich, S. Wartzack, Production Engineering (2021). date_created: 2022-03-29T09:19:07Z date_updated: 2023-01-02T11:19:55Z department: - _id: '630' doi: 10.1007/s11740-021-01098-4 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: '144' name: 'TRR 285 – B05: TRR 285 - Subproject B05' publication: Production Engineering status: public title: Application of reinforcement learning for the optimization of clinch joint characteristics type: journal_article user_id: '14931' year: '2021' ... --- _id: '30701' author: - first_name: D. full_name: Römisch, D. last_name: Römisch - first_name: J. full_name: Popp, J. last_name: Popp - first_name: D. full_name: Drummer, D. last_name: Drummer - first_name: M. full_name: Merklein, M. last_name: Merklein citation: ama: Römisch D, Popp J, Drummer D, Merklein M. Joining of CFRT-steel hybrid parts via hole-forming and subsequent pin caulking. Production Engineering. Published online 2021. doi:10.1007/s11740-021-01093-9 apa: Römisch, D., Popp, J., Drummer, D., & Merklein, M. (2021). Joining of CFRT-steel hybrid parts via hole-forming and subsequent pin caulking. Production Engineering. https://doi.org/10.1007/s11740-021-01093-9 bibtex: '@article{Römisch_Popp_Drummer_Merklein_2021, title={Joining of CFRT-steel hybrid parts via hole-forming and subsequent pin caulking}, DOI={10.1007/s11740-021-01093-9}, journal={Production Engineering}, author={Römisch, D. and Popp, J. and Drummer, D. and Merklein, M.}, year={2021} }' chicago: Römisch, D., J. Popp, D. Drummer, and M. Merklein. “Joining of CFRT-Steel Hybrid Parts via Hole-Forming and Subsequent Pin Caulking.” Production Engineering, 2021. https://doi.org/10.1007/s11740-021-01093-9. ieee: 'D. Römisch, J. Popp, D. Drummer, and M. Merklein, “Joining of CFRT-steel hybrid parts via hole-forming and subsequent pin caulking,” Production Engineering, 2021, doi: 10.1007/s11740-021-01093-9.' mla: Römisch, D., et al. “Joining of CFRT-Steel Hybrid Parts via Hole-Forming and Subsequent Pin Caulking.” Production Engineering, 2021, doi:10.1007/s11740-021-01093-9. short: D. Römisch, J. Popp, D. Drummer, M. Merklein, Production Engineering (2021). date_created: 2022-03-29T09:21:36Z date_updated: 2023-01-02T11:20:14Z department: - _id: '630' doi: 10.1007/s11740-021-01093-9 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: '145' name: 'TRR 285 – C01: TRR 285 - Subproject C01' publication: Production Engineering status: public title: Joining of CFRT-steel hybrid parts via hole-forming and subsequent pin caulking type: journal_article user_id: '14931' year: '2021' ... --- _id: '30697' author: - first_name: R. full_name: Lafarge, R. last_name: Lafarge - first_name: A. full_name: Wolf, A. last_name: Wolf - first_name: C. full_name: Guilleaume, C. last_name: Guilleaume - first_name: A. full_name: Brosius, A. last_name: Brosius citation: ama: Lafarge R, Wolf A, Guilleaume C, Brosius A. A New Non-destructive Testing Method Applied to Clinching. Minerals, Metals and Materials Series. Published online 2021:1461. doi:10.1007/978-3-030-75381-8_121 apa: Lafarge, R., Wolf, A., Guilleaume, C., & Brosius, A. (2021). A New Non-destructive Testing Method Applied to Clinching. Minerals, Metals and Materials Series, 1461. https://doi.org/10.1007/978-3-030-75381-8_121 bibtex: '@article{Lafarge_Wolf_Guilleaume_Brosius_2021, title={A New Non-destructive Testing Method Applied to Clinching}, DOI={10.1007/978-3-030-75381-8_121}, journal={Minerals, Metals and Materials Series}, author={Lafarge, R. and Wolf, A. and Guilleaume, C. and Brosius, A.}, year={2021}, pages={1461} }' chicago: Lafarge, R., A. Wolf, C. Guilleaume, and A. Brosius. “A New Non-Destructive Testing Method Applied to Clinching.” Minerals, Metals and Materials Series, 2021, 1461. https://doi.org/10.1007/978-3-030-75381-8_121. ieee: 'R. Lafarge, A. Wolf, C. Guilleaume, and A. Brosius, “A New Non-destructive Testing Method Applied to Clinching,” Minerals, Metals and Materials Series, p. 1461, 2021, doi: 10.1007/978-3-030-75381-8_121.' mla: Lafarge, R., et al. “A New Non-Destructive Testing Method Applied to Clinching.” Minerals, Metals and Materials Series, 2021, p. 1461, doi:10.1007/978-3-030-75381-8_121. short: R. Lafarge, A. Wolf, C. Guilleaume, A. Brosius, Minerals, Metals and Materials Series (2021) 1461. date_created: 2022-03-29T09:14:12Z date_updated: 2023-01-02T11:20:45Z department: - _id: '630' doi: 10.1007/978-3-030-75381-8_121 language: - iso: eng page: '1461' 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: Minerals, Metals and Materials Series status: public title: A New Non-destructive Testing Method Applied to Clinching type: journal_article user_id: '14931' year: '2021' ... --- _id: '30684' abstract: - lang: eng text: Due to stricter emission targets in the mobility sector and the resulting trend towards lightweight construction in order to reduce weight and consequently emissions, multi-material systems that allow a material to be placed in the right quantity and in the right place are becoming increasingly important. One major challenge that is holding back the rapid and widespread use of multi-material systems is the lack of adequate joining processes that are suitable for joining dissimilar materials. Joining processes without auxiliary elements have the advantage of a reduced assembly effort and no additional added weight. Conventional joining processes without auxiliary elements, such as welding, clinching, or the use of adhesives, reach their limits due to different mechanical properties and chemical incompatibilities. A process with potential in the field of joining dissimilar materials is joining without an auxiliary element using pin structures. However, current pin manufacturing processes are mostly time-consuming or can only be integrated barely into existing industrial manufacturing processes due to their specific properties. For this reason, the present work investigates the production of single- and multi-pin structures from high-strength dual-phase steel HCT590X + Z (DP600, t0 = 1.5 mm) by cold extrusion directly out of the sheet metal. These structures are subsequently joined with an aluminium sheet (EN AW-6014-T4, t0 = 1.5 mm) by direct pin pressing. For a quantitative evaluation of the joint quality, tensile shear tests are carried out and the influence of different pin heights, pin number, and pin arrangements, as well as different joining strategies on the joint strength is experimentally evaluated. It is proven that a single pin structure with a diameter of 1.5 mm and an average height of 1.86 mm achieves a maximum tensile shear force of 1025 N. The results reveal that the formation of a form-fit during direct pin pressing is essential for the joint strength. By increasing the number of pins, a linear increase in force could be demonstrated, which is independent of the arrangement of the pin structures. author: - first_name: D. full_name: Römisch, D. last_name: Römisch - first_name: M. full_name: Kraus, M. last_name: Kraus - first_name: M. full_name: Merklein, M. last_name: Merklein citation: ama: Römisch D, Kraus M, Merklein M. Experimental study on joining by forming of hct590x + z and en-aw 6014 sheets using cold extruded pin structures. Journal of Manufacturing and Materials Processing. 2021;5:25. doi:10.3390/jmmp5010025 apa: Römisch, D., Kraus, M., & Merklein, M. (2021). Experimental study on joining by forming of hct590x + z and en-aw 6014 sheets using cold extruded pin structures. Journal of Manufacturing and Materials Processing, 5, 25. https://doi.org/10.3390/jmmp5010025 bibtex: '@article{Römisch_Kraus_Merklein_2021, title={Experimental study on joining by forming of hct590x + z and en-aw 6014 sheets using cold extruded pin structures}, volume={5}, DOI={10.3390/jmmp5010025}, journal={Journal of Manufacturing and Materials Processing}, author={Römisch, D. and Kraus, M. and Merklein, M.}, year={2021}, pages={25} }' chicago: 'Römisch, D., M. Kraus, and M. Merklein. “Experimental Study on Joining by Forming of Hct590x + z and En-Aw 6014 Sheets Using Cold Extruded Pin Structures.” Journal of Manufacturing and Materials Processing 5 (2021): 25. https://doi.org/10.3390/jmmp5010025.' ieee: 'D. Römisch, M. Kraus, and M. Merklein, “Experimental study on joining by forming of hct590x + z and en-aw 6014 sheets using cold extruded pin structures,” Journal of Manufacturing and Materials Processing, vol. 5, p. 25, 2021, doi: 10.3390/jmmp5010025.' mla: Römisch, D., et al. “Experimental Study on Joining by Forming of Hct590x + z and En-Aw 6014 Sheets Using Cold Extruded Pin Structures.” Journal of Manufacturing and Materials Processing, vol. 5, 2021, p. 25, doi:10.3390/jmmp5010025. short: D. Römisch, M. Kraus, M. Merklein, Journal of Manufacturing and Materials Processing 5 (2021) 25. date_created: 2022-03-29T08:48:14Z date_updated: 2023-01-02T11:47:27Z department: - _id: '630' doi: 10.3390/jmmp5010025 intvolume: ' 5' language: - iso: eng page: '25' project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '145' name: 'TRR 285 – C01: TRR 285 - Subproject C01' publication: Journal of Manufacturing and Materials Processing status: public title: Experimental study on joining by forming of hct590x + z and en-aw 6014 sheets using cold extruded pin structures type: journal_article user_id: '14931' volume: 5 year: '2021' ... --- _id: '30682' abstract: - lang: eng text: 'Lightweight constructions become more and more important, especially in the mobility sector. In this industry, the increasingly strict regulations regarding the emissions of carbon dioxide can be achieved to a certain extent by reducing the vehicle weight. Thus, multi-material systems are used. Conventional joining techniques reach their limits when joining different materials due to different thermal expansion, unequal stiffness or chemical incompatibilities. This is why additional joining elements or adhesives are used. These must be viewed critically regarding a lightweight and resource-efficient production, since they add weight or complicate the recycling process of these components. Consequently, there is a great and growing need for new versatile joining technologies in order to overcome these challenges and to be able to react to changing process parameters and boundary conditions. Joining without an auxiliary element using pin structures formed directly from the sheet metal plane is one approach to meet these challenges. These pin structures are then joined by direct pressing into the joining partner. This is possible with a variety of material combinations, but is advantageous with regard to continuous fibre-reinforced thermoplastic composites (CFRTP), as the fibres do not have to be cut when joining CFRTP using pin structures. In this paper, the formability of pin structures made of a dual-phase steel DP600 (HCT590X + Z) is investigated. The extruded pin structures are joined by direct pin pressing with an EN AW-6014 to form tensile shear specimens. Different joining strategies are investigated to compare their influence on the joint strength. The results have shown that it is feasible to form suitable pins from a DP600 dual-phase steel to produce reliable connections with an aluminium sheet joined by direct pin pressing. ' author: - first_name: D. full_name: Römisch, D. last_name: Römisch - first_name: M. full_name: Kraus, M. last_name: Kraus - first_name: M. full_name: Merklein, M. last_name: Merklein citation: ama: Römisch D, Kraus M, Merklein M. Investigation of Different Joining by Forming Strategies when Connecting Different Metals without Auxiliary Elements. Key Engineering Materials. 2021;883:19-26. doi:10.4028/www.scientific.net/kem.883.19 apa: Römisch, D., Kraus, M., & Merklein, M. (2021). Investigation of Different Joining by Forming Strategies when Connecting Different Metals without Auxiliary Elements. Key Engineering Materials, 883, 19–26. https://doi.org/10.4028/www.scientific.net/kem.883.19 bibtex: '@article{Römisch_Kraus_Merklein_2021, title={Investigation of Different Joining by Forming Strategies when Connecting Different Metals without Auxiliary Elements}, volume={883}, DOI={10.4028/www.scientific.net/kem.883.19}, journal={Key Engineering Materials}, author={Römisch, D. and Kraus, M. and Merklein, M.}, year={2021}, pages={19–26} }' chicago: 'Römisch, D., M. Kraus, and M. Merklein. “Investigation of Different Joining by Forming Strategies When Connecting Different Metals without Auxiliary Elements.” Key Engineering Materials 883 (2021): 19–26. https://doi.org/10.4028/www.scientific.net/kem.883.19.' ieee: 'D. Römisch, M. Kraus, and M. Merklein, “Investigation of Different Joining by Forming Strategies when Connecting Different Metals without Auxiliary Elements,” Key Engineering Materials, vol. 883, pp. 19–26, 2021, doi: 10.4028/www.scientific.net/kem.883.19.' mla: Römisch, D., et al. “Investigation of Different Joining by Forming Strategies When Connecting Different Metals without Auxiliary Elements.” Key Engineering Materials, vol. 883, 2021, pp. 19–26, doi:10.4028/www.scientific.net/kem.883.19. short: D. Römisch, M. Kraus, M. Merklein, Key Engineering Materials 883 (2021) 19–26. date_created: 2022-03-29T08:45:16Z date_updated: 2023-01-02T11:47:47Z department: - _id: '630' doi: 10.4028/www.scientific.net/kem.883.19 intvolume: ' 883' language: - iso: eng page: 19-26 project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '145' name: 'TRR 285 – C01: TRR 285 - Subproject C01' publication: Key Engineering Materials status: public title: Investigation of Different Joining by Forming Strategies when Connecting Different Metals without Auxiliary Elements type: journal_article user_id: '14931' volume: 883 year: '2021' ... --- _id: '30718' abstract: - lang: eng text: The growing demands of resource-saving processes and products are leading to increasing importance of lightweight construction for the automotive industry. One approach is multi-material design, which uses high-strength steels and aluminium alloys in the production of vehicle bodies. Therefore, reliable processes for joining components with different mechanical properties and geometries are necessary. As conventional joining processes reach their limits, new versatile processes and methods are required which can adapt to different process conditions and disturbance variables. A widely used joining process to join different materials is self-piercing riveting as a joining by forming method, however it is characterised as inflexible to changing process conditions due to a linear process kinematic and rigid dies. An approach to extend the process limits is the application of a tumbling kinematic for the punch. Thus, an adapted tumbling strategy can be used to influence the joining process and to achieve a controlled material flow in order to manufacture tailored joints. For the fundamental investigation of the process, numerical investigations are necessary. In order to achieve high model quality a precise material modelling is crucial. Therefore, a characterisation of the materials HCT590X+Z and EN AW-6014 as typical materials of multi-material mixes and the rivet material 38B2 is performed. Due to the different stress conditions during tumbling self-piercing riveting suitable characterisation methods are selected and carried out. author: - first_name: S. full_name: Wituschek, S. last_name: Wituschek - first_name: M. full_name: Lechner, M. last_name: Lechner citation: ama: Wituschek S, Lechner M. Material characterisation methods for a tumbling self-piercing riveting process. ESAFORM 2021. Published online 2021. doi:10.25518/esaform21.398 apa: Wituschek, S., & Lechner, M. (2021). Material characterisation methods for a tumbling self-piercing riveting process. ESAFORM 2021. https://doi.org/10.25518/esaform21.398 bibtex: '@article{Wituschek_Lechner_2021, title={Material characterisation methods for a tumbling self-piercing riveting process}, DOI={10.25518/esaform21.398}, journal={ESAFORM 2021}, author={Wituschek, S. and Lechner, M.}, year={2021} }' chicago: Wituschek, S., and M. Lechner. “Material Characterisation Methods for a Tumbling Self-Piercing Riveting Process.” ESAFORM 2021, 2021. https://doi.org/10.25518/esaform21.398. ieee: 'S. Wituschek and M. Lechner, “Material characterisation methods for a tumbling self-piercing riveting process,” ESAFORM 2021, 2021, doi: 10.25518/esaform21.398.' mla: Wituschek, S., and M. Lechner. “Material Characterisation Methods for a Tumbling Self-Piercing Riveting Process.” ESAFORM 2021, 2021, doi:10.25518/esaform21.398. short: S. Wituschek, M. Lechner, ESAFORM 2021 (2021). date_created: 2022-03-29T10:34:25Z date_updated: 2023-01-02T11:47:03Z department: - _id: '630' doi: 10.25518/esaform21.398 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: '146' name: 'TRR 285 – C02: TRR 285 - Subproject C02' publication: ESAFORM 2021 status: public title: Material characterisation methods for a tumbling self-piercing riveting process type: journal_article user_id: '14931' year: '2021' ... --- _id: '30683' abstract: - lang: eng text: 'When joining lightweight parts of various materials, clinching is a cost efficient solution. In a production line, the quality of a clinch point is primarily controlled by measurement of dimensions, which are accessible from outside. However, methods such as visual testing and measuring the bottom thickness as well as the outer diameter are not able to deliver any information about the most significant geometrical characteristic of the clinch point, neck thickness and undercut. Furthermore, ex-situ destructive methods such as microsectioning cannot detect elastic deformations and cracks that close after unloading. In order to exceed the current limits, a new non-destructive in-situ testing method for the clinching process is necessary. This work proposes a concept to characterize clinch points in-situ by combining two complementary non-destructive methods, namely, computed tomography (CT) and ultrasonic testing. Firstly, clinch points with different geometrical characteristics are analysed experimentally using ex-situ CT to get a highly spatially resolved 3D-image of the object. In this context, highly X-ray attenuating materials enhancing the visibility of the sheet-sheet interface are investigated. Secondly, the test specimens are modelled using finite element method (FEM) and a transient dynamic analysis (TDA) is conducted to study the effect of the geometrical differences on the deformation energy and to qualify the TDA as a fast in-situ non-destructive method for characterizing clinch points at high temporal resolution. ' author: - first_name: D. full_name: Köhler, D. last_name: Köhler - first_name: B. full_name: Sadeghian, B. last_name: Sadeghian - 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: Köhler D, Sadeghian B, Kupfer R, Troschitz J, Gude M, Brosius A. A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis. Key Engineering Materials. 2021;883:89-96. doi:10.4028/www.scientific.net/kem.883.89 apa: Köhler, D., Sadeghian, B., Kupfer, R., Troschitz, J., Gude, M., & Brosius, A. (2021). A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis. Key Engineering Materials, 883, 89–96. https://doi.org/10.4028/www.scientific.net/kem.883.89 bibtex: '@article{Köhler_Sadeghian_Kupfer_Troschitz_Gude_Brosius_2021, title={A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis}, volume={883}, DOI={10.4028/www.scientific.net/kem.883.89}, journal={Key Engineering Materials}, author={Köhler, D. and Sadeghian, B. and Kupfer, R. and Troschitz, J. and Gude, M. and Brosius, A.}, year={2021}, pages={89–96} }' chicago: 'Köhler, D., B. Sadeghian, R. Kupfer, J. Troschitz, M. Gude, and A. Brosius. “A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Key Engineering Materials 883 (2021): 89–96. https://doi.org/10.4028/www.scientific.net/kem.883.89.' ieee: 'D. Köhler, B. Sadeghian, R. Kupfer, J. Troschitz, M. Gude, and A. Brosius, “A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis,” Key Engineering Materials, vol. 883, pp. 89–96, 2021, doi: 10.4028/www.scientific.net/kem.883.89.' mla: Köhler, D., et al. “A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Key Engineering Materials, vol. 883, 2021, pp. 89–96, doi:10.4028/www.scientific.net/kem.883.89. short: D. Köhler, B. Sadeghian, R. Kupfer, J. Troschitz, M. Gude, A. Brosius, Key Engineering Materials 883 (2021) 89–96. date_created: 2022-03-29T08:46:40Z date_updated: 2023-01-02T11:48:16Z department: - _id: '630' doi: 10.4028/www.scientific.net/kem.883.89 intvolume: ' 883' language: - iso: eng page: 89-96 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 status: public title: A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis type: journal_article user_id: '14931' volume: 883 year: '2021' ... --- _id: '30663' abstract: - lang: eng text: 'The use of clinch joints, e.g. vehicle structures, is determined by the reliability of the joint and its strength properties - in particular the fatigue strength. Clinch connections offer the advantage over form-closure and force-closure processes that they can also be used for hybrid material combinations. In order to be able to evaluate the influence of the geometry parameters such as e.g. undercut, neck thickness or also base thickness on the fatigue behavior, three clinch connections (in optimum and compromise design) with different tool parameters were designed and examined using the example of a joining task with aluminum sheet material. For this purpose, fatigue curves (F-N curves) in the range of high to very high numbers of load cycles (N = 105 to 107) were determined. In this load cycle range, a so-called "neck fracture" is mainly to be expected as the type of failure, whereas for quasi-static tests, a “buckling” is more likely to occur. The tests were carried out on single-cut overlapping shear tensile specimens. Metallographic and scanning electron microscopic examinations of the joints and the fracture surfaces served to identify the crack initiation site and to clarify the respective type of failure. Significant differences in the damage behaviour of the three clinching variants could be shown. This observation enables one step into the direction of fully understanding the relationship along the causal chain "joint requirements - joining process - fatigue strength". Thus the adaptability of the clinching process can be improved. ' author: - first_name: L. full_name: Ewenz, L. last_name: Ewenz - first_name: J. full_name: Kalich, J. last_name: Kalich - first_name: M. full_name: Zimmermann, M. last_name: Zimmermann - first_name: U. full_name: Füssel, U. last_name: Füssel citation: ama: Ewenz L, Kalich J, Zimmermann M, Füssel U. Effect of Different Tool Geometries on the Mechanical Properties of Al-Al Clinch Joints. Key Engineering Materials. 2021;883:65-72. doi:10.4028/www.scientific.net/kem.883.65 apa: Ewenz, L., Kalich, J., Zimmermann, M., & Füssel, U. (2021). Effect of Different Tool Geometries on the Mechanical Properties of Al-Al Clinch Joints. Key Engineering Materials, 883, 65–72. https://doi.org/10.4028/www.scientific.net/kem.883.65 bibtex: '@article{Ewenz_Kalich_Zimmermann_Füssel_2021, title={Effect of Different Tool Geometries on the Mechanical Properties of Al-Al Clinch Joints}, volume={883}, DOI={10.4028/www.scientific.net/kem.883.65}, journal={Key Engineering Materials}, author={Ewenz, L. and Kalich, J. and Zimmermann, M. and Füssel, U.}, year={2021}, pages={65–72} }' chicago: 'Ewenz, L., J. Kalich, M. Zimmermann, and U. Füssel. “Effect of Different Tool Geometries on the Mechanical Properties of Al-Al Clinch Joints.” Key Engineering Materials 883 (2021): 65–72. https://doi.org/10.4028/www.scientific.net/kem.883.65.' ieee: 'L. Ewenz, J. Kalich, M. Zimmermann, and U. Füssel, “Effect of Different Tool Geometries on the Mechanical Properties of Al-Al Clinch Joints,” Key Engineering Materials, vol. 883, pp. 65–72, 2021, doi: 10.4028/www.scientific.net/kem.883.65.' mla: Ewenz, L., et al. “Effect of Different Tool Geometries on the Mechanical Properties of Al-Al Clinch Joints.” Key Engineering Materials, vol. 883, 2021, pp. 65–72, doi:10.4028/www.scientific.net/kem.883.65. short: L. Ewenz, J. Kalich, M. Zimmermann, U. Füssel, Key Engineering Materials 883 (2021) 65–72. date_created: 2022-03-28T14:00:19Z date_updated: 2023-01-02T11:49:08Z department: - _id: '630' doi: 10.4028/www.scientific.net/kem.883.65 intvolume: ' 883' language: - iso: eng page: 65-72 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: '138' name: 'TRR 285 – A04: TRR 285 - Subproject A04' - _id: '131' name: 'TRR 285 - A: TRR 285 - Project Area A' publication: Key Engineering Materials status: public title: Effect of Different Tool Geometries on the Mechanical Properties of Al-Al Clinch Joints type: journal_article user_id: '14931' volume: 883 year: '2021' ... --- _id: '30688' abstract: - lang: eng text: 'Thermally supported clinching (Hotclinch) is a novel promising process to join dissimilar materials. Here, metal and fibre-reinforced thermoplastics (FRTP) are used within this single step joining process and without the usage of auxiliary parts like screws or rivets. For this purpose, heat is applied to improve the formability of the reinforced thermoplastic. This enables joining of the materials using conventional clinching-tools. Focus of this work is the modelling on mesoscopic scale for the numerical simulation of this process. The FTRP-model takes the material behaviour both of matrix and the fabric reinforced organo-sheet under process temperatures into account. For describing the experimentally observed phenomena such as large deformations, fibre failure and the interactions between matrix and fibres as well as between fibres themselves, the usage of conventional, purely Lagrangian based FEM methods is limited. Therefore, the combination of contact-models with advanced modelling approaches like Arbitrary-Lagrangian-Eulerian (ALE), Coupled-Eulerian-Lagrangian (CEL) and Smooth-ParticleHydrodynamics (SPH) for the numerical simulation of the clinching process are employed. The different approaches are compared with regard to simulation feasibility, robustness and results accuracy. It is shown, that the CEL approach represents the most promising approach to describe the clinching process. ' author: - first_name: B. full_name: Gröger, B. last_name: Gröger - first_name: A. full_name: Hornig, A. last_name: Hornig - first_name: A. full_name: Hoog, A. last_name: Hoog - first_name: M. full_name: Gude, M. last_name: Gude citation: ama: 'Gröger B, Hornig A, Hoog A, Gude M. Modelling of thermally supported clinching of fibre-reinforced thermoplastics: Approaches on mesoscale considering large deformations and fibre failure. ESAFORM 2021 - 24th International Conference on Material Forming. Published online 2021. doi:10.25518/esaform21.4293' apa: 'Gröger, B., Hornig, A., Hoog, A., & Gude, M. (2021). Modelling of thermally supported clinching of fibre-reinforced thermoplastics: Approaches on mesoscale considering large deformations and fibre failure. ESAFORM 2021 - 24th International Conference on Material Forming. https://doi.org/10.25518/esaform21.4293' bibtex: '@article{Gröger_Hornig_Hoog_Gude_2021, title={Modelling of thermally supported clinching of fibre-reinforced thermoplastics: Approaches on mesoscale considering large deformations and fibre failure}, DOI={10.25518/esaform21.4293}, journal={ESAFORM 2021 - 24th International Conference on Material Forming}, author={Gröger, B. and Hornig, A. and Hoog, A. and Gude, M.}, year={2021} }' chicago: 'Gröger, B., A. Hornig, A. Hoog, and M. Gude. “Modelling of Thermally Supported Clinching of Fibre-Reinforced Thermoplastics: Approaches on Mesoscale Considering Large Deformations and Fibre Failure.” ESAFORM 2021 - 24th International Conference on Material Forming, 2021. https://doi.org/10.25518/esaform21.4293.' ieee: 'B. Gröger, A. Hornig, A. Hoog, and M. Gude, “Modelling of thermally supported clinching of fibre-reinforced thermoplastics: Approaches on mesoscale considering large deformations and fibre failure,” ESAFORM 2021 - 24th International Conference on Material Forming, 2021, doi: 10.25518/esaform21.4293.' mla: 'Gröger, B., et al. “Modelling of Thermally Supported Clinching of Fibre-Reinforced Thermoplastics: Approaches on Mesoscale Considering Large Deformations and Fibre Failure.” ESAFORM 2021 - 24th International Conference on Material Forming, 2021, doi:10.25518/esaform21.4293.' short: B. Gröger, A. Hornig, A. Hoog, M. Gude, ESAFORM 2021 - 24th International Conference on Material Forming (2021). date_created: 2022-03-29T08:52:57Z date_updated: 2023-01-02T11:50:35Z department: - _id: '630' doi: 10.25518/esaform21.4293 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' publication: ESAFORM 2021 - 24th International Conference on Material Forming status: public title: 'Modelling of thermally supported clinching of fibre-reinforced thermoplastics: Approaches on mesoscale considering large deformations and fibre failure' type: journal_article user_id: '14931' year: '2021' ... --- _id: '30685' abstract: - lang: eng text: Joints are an essential part of modern (lightweight) structures in a broad variety of applications. The reason for this is the rapidly increasing number of different material combinations needing to be joined in application areas like the automotive industry. It is currently common to use numerous auxiliary or standardized elements instead of individually adapted joining elements. This leads to a large number of different joining elements per product and thus to high costs. An innovative approach to overcoming this issue is the design, manufacture and setting of joint-specific joining elements. A good candidate for the manufacture of adapted joining elements of this type is the so-called friction spinning process. The joining elements formed in this way can be specifically adapted to the application in question in terms of both shape and mechanical properties. The part geometry required for the properties of a given joint is formed using a universal forming tool. This makes it possible to form a wide variety of sub geometries for the auxiliary joining part as a function of the prevailing joint condition, using a single forming tool and starting from the same semi-finished bar material. By applying different process strategies for the rotational speed and feed rate during the forming operation, the same part geometry can even be given different local mechanical properties. The following contribution presents the results of ongoing research work and includes the process concept, process properties, tooling and the results of experimental investigations into the joining of two sheet metal parts with help of this new joining process. author: - first_name: E. full_name: Wiens, E. last_name: Wiens - first_name: C. full_name: Wischer, C. last_name: Wischer - first_name: W. full_name: Homberg, W. last_name: Homberg citation: ama: Wiens E, Wischer C, Homberg W. Development of a novel adaptive joining technology employing friction-spun joint connectors (FSJC). ESAFORM. Published online 2021:4682. doi:10.25518/esaform21.4682 apa: Wiens, E., Wischer, C., & Homberg, W. (2021). Development of a novel adaptive joining technology employing friction-spun joint connectors (FSJC). ESAFORM, 4682. https://doi.org/10.25518/esaform21.4682 bibtex: '@article{Wiens_Wischer_Homberg_2021, title={Development of a novel adaptive joining technology employing friction-spun joint connectors (FSJC)}, DOI={10.25518/esaform21.4682}, journal={ESAFORM}, author={Wiens, E. and Wischer, C. and Homberg, W.}, year={2021}, pages={4682} }' chicago: Wiens, E., C. Wischer, and W. Homberg. “Development of a Novel Adaptive Joining Technology Employing Friction-Spun Joint Connectors (FSJC).” ESAFORM, 2021, 4682. https://doi.org/10.25518/esaform21.4682. ieee: 'E. Wiens, C. Wischer, and W. Homberg, “Development of a novel adaptive joining technology employing friction-spun joint connectors (FSJC),” ESAFORM, p. 4682, 2021, doi: 10.25518/esaform21.4682.' mla: Wiens, E., et al. “Development of a Novel Adaptive Joining Technology Employing Friction-Spun Joint Connectors (FSJC).” ESAFORM, 2021, p. 4682, doi:10.25518/esaform21.4682. short: E. Wiens, C. Wischer, W. Homberg, ESAFORM (2021) 4682. date_created: 2022-03-29T08:49:33Z date_updated: 2023-01-02T11:49:31Z department: - _id: '630' doi: 10.25518/esaform21.4682 language: - iso: eng page: '4682' project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '147' name: 'TRR 285 – C03: TRR 285 - Subproject C03' publication: ESAFORM status: public title: Development of a novel adaptive joining technology employing friction-spun joint connectors (FSJC) type: journal_article user_id: '14931' year: '2021' ... --- _id: '30664' abstract: - lang: eng text: 'Corrosion is a major cause for the failure of metallic components in various branches of the industry. Depending on the corrosion severity, the time until failure of the component varies. On the contrary, a study has shown that certain riveted metal joints, exposed to a short period of mechanical loading and corrosion, have greater fatigue limits. This study gives rise to the question how different corrosion exposure times affect joint metallic components. In the present research, a theoretical approach is developed in order to evaluate the influence of galvanic corrosion on joint integrity of clinched metal joints. At first, the framework for modeling galvanic corrosion is introduced. Furthermore, a simulative investigation of a clinching point is carried out based on the assumption that corrosion leads to a reduction of the contact area which leads to a local increase in contact pressure. For this purpose, the stiffness values of individual elements in a finite element model are reduced locally in the contact area of the undercut and the contact stress along a path is evaluated. Summarizing, a modeling approach is introduced to investigate corrosion effects on load-bearing behavior of clinched joints. ' author: - first_name: S. full_name: Harzheim, S. last_name: Harzheim - first_name: C. full_name: Steinfelder, C. last_name: Steinfelder - first_name: T. full_name: Wallmersperger, T. last_name: Wallmersperger - first_name: A. full_name: Brosius, A. last_name: Brosius citation: ama: Harzheim S, Steinfelder C, Wallmersperger T, Brosius A. A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints. Key Engineering Materials. 2021;883:97-104. doi:10.4028/www.scientific.net/kem.883.97 apa: Harzheim, S., Steinfelder, C., Wallmersperger, T., & Brosius, A. (2021). A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints. Key Engineering Materials, 883, 97–104. https://doi.org/10.4028/www.scientific.net/kem.883.97 bibtex: '@article{Harzheim_Steinfelder_Wallmersperger_Brosius_2021, title={A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints}, volume={883}, DOI={10.4028/www.scientific.net/kem.883.97}, journal={Key Engineering Materials}, author={Harzheim, S. and Steinfelder, C. and Wallmersperger, T. and Brosius, A.}, year={2021}, pages={97–104} }' chicago: 'Harzheim, S., C. Steinfelder, T. Wallmersperger, and A. Brosius. “A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints.” Key Engineering Materials 883 (2021): 97–104. https://doi.org/10.4028/www.scientific.net/kem.883.97.' ieee: 'S. Harzheim, C. Steinfelder, T. Wallmersperger, and A. Brosius, “A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints,” Key Engineering Materials, vol. 883, pp. 97–104, 2021, doi: 10.4028/www.scientific.net/kem.883.97.' mla: Harzheim, S., et al. “A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints.” Key Engineering Materials, vol. 883, 2021, pp. 97–104, doi:10.4028/www.scientific.net/kem.883.97. short: S. Harzheim, C. Steinfelder, T. Wallmersperger, A. Brosius, Key Engineering Materials 883 (2021) 97–104. date_created: 2022-03-28T14:04:56Z date_updated: 2023-01-02T11:49:52Z department: - _id: '630' doi: 10.4028/www.scientific.net/kem.883.97 intvolume: ' 883' language: - iso: eng page: 97-104 project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '132' name: 'TRR 285 - B: TRR 285 - Project Area B' - _id: '142' name: 'TRR 285 – B03: TRR 285 - Subproject B03' - _id: '140' name: 'TRR 285 – B01: TRR 285 - Subproject B01' publication: Key Engineering Materials status: public title: A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints type: journal_article user_id: '14931' volume: 883 year: '2021' ... --- _id: '30694' abstract: - lang: eng text: In recent years, clinching has gathered popularity to join sheets of different materials in industrial applications. The manufacturing process has some advantages, as reduced joining time, reduced costs, and the joints show good fatigue properties. To ensure the joint strength, reliable simulations of the material behaviour accounting for process-induced damage are expected to be beneficial to obtain credible values for the ultimate joint strength and its fatigue limit. A finite plasticity gradient-damage material model is outlined to describe the plastic and damage evolutions during the forming of sheet metals, later applied to clinching. The utilised gradient-enhancement cures the damage-induced localisation by introducing a global damage variable as an additional finite element field. Both, plasticity and damage are strongly coupled, but can, due to a dual-surface approach, evolve independently. The ability of the material model to predict damage in strongly deformed sheets, its flexibility and its regularization properties are illustrated by numerical examples. author: - first_name: J. full_name: Friedlein, J. last_name: Friedlein - first_name: J. full_name: Mergheim, J. last_name: Mergheim - first_name: P. full_name: Steinmann, P. last_name: Steinmann citation: ama: Friedlein J, Mergheim J, Steinmann P. A finite plasticity gradient-damage model for sheet metals during forming and clinching. Key Engineering Materials. 2021;883 KEM:57. doi:10.4028/www.scientific.net/KEM.883.57 apa: Friedlein, J., Mergheim, J., & Steinmann, P. (2021). A finite plasticity gradient-damage model for sheet metals during forming and clinching. Key Engineering Materials, 883 KEM, 57. https://doi.org/10.4028/www.scientific.net/KEM.883.57 bibtex: '@article{Friedlein_Mergheim_Steinmann_2021, title={A finite plasticity gradient-damage model for sheet metals during forming and clinching}, volume={883 KEM}, DOI={10.4028/www.scientific.net/KEM.883.57}, journal={Key Engineering Materials}, author={Friedlein, J. and Mergheim, J. and Steinmann, P.}, year={2021}, pages={57} }' chicago: 'Friedlein, J., J. Mergheim, and P. Steinmann. “A Finite Plasticity Gradient-Damage Model for Sheet Metals during Forming and Clinching.” Key Engineering Materials 883 KEM (2021): 57. https://doi.org/10.4028/www.scientific.net/KEM.883.57.' ieee: 'J. Friedlein, J. Mergheim, and P. Steinmann, “A finite plasticity gradient-damage model for sheet metals during forming and clinching,” Key Engineering Materials, vol. 883 KEM, p. 57, 2021, doi: 10.4028/www.scientific.net/KEM.883.57.' mla: Friedlein, J., et al. “A Finite Plasticity Gradient-Damage Model for Sheet Metals during Forming and Clinching.” Key Engineering Materials, vol. 883 KEM, 2021, p. 57, doi:10.4028/www.scientific.net/KEM.883.57. short: J. Friedlein, J. Mergheim, P. Steinmann, Key Engineering Materials 883 KEM (2021) 57. date_created: 2022-03-29T09:08:21Z date_updated: 2023-01-02T11:50:57Z department: - _id: '630' doi: 10.4028/www.scientific.net/KEM.883.57 language: - iso: eng page: '57' project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '131' name: 'TRR 285 - A: TRR 285 - Project Area A' - _id: '139' name: 'TRR 285 – A05: TRR 285 - Subproject A05' publication: Key Engineering Materials status: public title: A finite plasticity gradient-damage model for sheet metals during forming and clinching type: journal_article user_id: '14931' volume: 883 KEM year: '2021' ... --- _id: '30689' abstract: - lang: eng text: 'Joining and local forming processes for fibre-reinforced thermoplastics (FRTP) like hole-forming or variations of the clinching process require an in-depth understanding of the process induced effects on meso-scale. For numerical modelling with a geometrical description of a woven fabric, adequate material models for a representative unit cell are identified. Model calibration is achieved employing a mesoscopic finite-element-approach using the embedded element method based on tensile tests of the consolidated organo-sheets and a phenomenological evaluation of photomicrographs. The model takes temperature dependent stiffness and fibre tension failure into account. ' author: - first_name: B. full_name: Gröger, B. last_name: Gröger - first_name: A. full_name: Hornig, A. last_name: Hornig - first_name: A. full_name: Hoog, A. last_name: Hoog - first_name: M. full_name: Gude, M. last_name: Gude citation: ama: Gröger B, Hornig A, Hoog A, Gude M. Temperature dependent modelling of fibre-reinforced thermoplastic organo-sheet material for forming and joining process simulations. Key Engineering Materials. 2021;883 KEM:49. doi:10.4028/www.scientific.net/KEM.883.49 apa: Gröger, B., Hornig, A., Hoog, A., & Gude, M. (2021). Temperature dependent modelling of fibre-reinforced thermoplastic organo-sheet material for forming and joining process simulations. Key Engineering Materials, 883 KEM, 49. https://doi.org/10.4028/www.scientific.net/KEM.883.49 bibtex: '@article{Gröger_Hornig_Hoog_Gude_2021, title={Temperature dependent modelling of fibre-reinforced thermoplastic organo-sheet material for forming and joining process simulations}, volume={883 KEM}, DOI={10.4028/www.scientific.net/KEM.883.49}, journal={Key Engineering Materials}, author={Gröger, B. and Hornig, A. and Hoog, A. and Gude, M.}, year={2021}, pages={49} }' chicago: 'Gröger, B., A. Hornig, A. Hoog, and M. Gude. “Temperature Dependent Modelling of Fibre-Reinforced Thermoplastic Organo-Sheet Material for Forming and Joining Process Simulations.” Key Engineering Materials 883 KEM (2021): 49. https://doi.org/10.4028/www.scientific.net/KEM.883.49.' ieee: 'B. Gröger, A. Hornig, A. Hoog, and M. Gude, “Temperature dependent modelling of fibre-reinforced thermoplastic organo-sheet material for forming and joining process simulations,” Key Engineering Materials, vol. 883 KEM, p. 49, 2021, doi: 10.4028/www.scientific.net/KEM.883.49.' mla: Gröger, B., et al. “Temperature Dependent Modelling of Fibre-Reinforced Thermoplastic Organo-Sheet Material for Forming and Joining Process Simulations.” Key Engineering Materials, vol. 883 KEM, 2021, p. 49, doi:10.4028/www.scientific.net/KEM.883.49. short: B. Gröger, A. Hornig, A. Hoog, M. Gude, Key Engineering Materials 883 KEM (2021) 49. date_created: 2022-03-29T08:54:24Z date_updated: 2023-01-02T11:51:23Z department: - _id: '630' doi: 10.4028/www.scientific.net/KEM.883.49 language: - iso: eng page: '49' 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' publication: Key Engineering Materials status: public title: Temperature dependent modelling of fibre-reinforced thermoplastic organo-sheet material for forming and joining process simulations type: journal_article user_id: '14931' volume: 883 KEM year: '2021' ... --- _id: '30720' abstract: - lang: eng text: Predicting the durability of components under mechanical loading combined with environmental conditions leading to corrosion is one of the most challenging tasks in mechanical engineering. Precise predictions are neccesary for lightweight design in transportation due to environmental protection. During corrosion often hydrogen is produced by electrochemical reactions. Hydrogen embrittlement is one of the most feared damage mechanisms for metal constructions leading to early and unexpected failure. Until now predictions are mostly done through costly experiments. In the present research, a first simple simulation model based on the fundamentals of electrochemistry and continuum damage mechanics is developed to couple the damage induced by the mechanical stress with the hydrogen embrittlement. Results of the durability are presented for the case of uniaxial cyclic loading for varying testing frequency. author: - first_name: M. full_name: Hofmann, M. last_name: Hofmann - first_name: Y. full_name: Shi, Y. last_name: Shi - first_name: T. full_name: Wallmersperger, T. last_name: Wallmersperger citation: ama: Hofmann M, Shi Y, Wallmersperger T. A first Model of Fatigue Corrosion of a Metal through Hydrogen Embrittlement. PAMM. 2021;20. doi:10.1002/pamm.202000122 apa: Hofmann, M., Shi, Y., & Wallmersperger, T. (2021). A first Model of Fatigue Corrosion of a Metal through Hydrogen Embrittlement. PAMM, 20. https://doi.org/10.1002/pamm.202000122 bibtex: '@article{Hofmann_Shi_Wallmersperger_2021, title={A first Model of Fatigue Corrosion of a Metal through Hydrogen Embrittlement}, volume={20}, DOI={10.1002/pamm.202000122}, journal={PAMM}, author={Hofmann, M. and Shi, Y. and Wallmersperger, T.}, year={2021} }' chicago: Hofmann, M., Y. Shi, and T. Wallmersperger. “A First Model of Fatigue Corrosion of a Metal through Hydrogen Embrittlement.” PAMM 20 (2021). https://doi.org/10.1002/pamm.202000122. ieee: 'M. Hofmann, Y. Shi, and T. Wallmersperger, “A first Model of Fatigue Corrosion of a Metal through Hydrogen Embrittlement,” PAMM, vol. 20, 2021, doi: 10.1002/pamm.202000122.' mla: Hofmann, M., et al. “A First Model of Fatigue Corrosion of a Metal through Hydrogen Embrittlement.” PAMM, vol. 20, 2021, doi:10.1002/pamm.202000122. short: M. Hofmann, Y. Shi, T. Wallmersperger, PAMM 20 (2021). date_created: 2022-03-29T10:36:29Z date_updated: 2023-01-02T11:50:14Z department: - _id: '630' doi: 10.1002/pamm.202000122 intvolume: ' 20' 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: '142' name: 'TRR 285 – B03: TRR 285 - Subproject B03' publication: PAMM status: public title: A first Model of Fatigue Corrosion of a Metal through Hydrogen Embrittlement type: journal_article user_id: '14931' volume: 20 year: '2021' ... --- _id: '30695' abstract: - lang: eng text: 'Due to their cost-efficiency and environmental friendliness, the demand of mechanical joining processes is constantly rising. However, the dimensioning and design of joints and suitable processes are mainly based on expert knowledge and few experimental data. Therefore, the performance of numerical and experimental studies enables the generation of optimized joining geometries. However, the manual evaluation of the results of such studies is often highly time-consuming. As a novel solution, image segmentation and machine learning algorithm provide methods to automate the analysis process. Motivated by this, the paper presents an approach for the automated analysis of geometrical characteristics using clinching as an example. ' author: - first_name: C. full_name: Zirngibl, C. last_name: Zirngibl - first_name: B. full_name: Schleich, B. last_name: Schleich citation: ama: Zirngibl C, Schleich B. Approach for the automated analysis of geometrical clinch joint characteristics. Key Engineering Materials. 2021;883 KEM:105. doi:10.4028/www.scientific.net/KEM.883.105 apa: Zirngibl, C., & Schleich, B. (2021). Approach for the automated analysis of geometrical clinch joint characteristics. Key Engineering Materials, 883 KEM, 105. https://doi.org/10.4028/www.scientific.net/KEM.883.105 bibtex: '@article{Zirngibl_Schleich_2021, title={Approach for the automated analysis of geometrical clinch joint characteristics}, volume={883 KEM}, DOI={10.4028/www.scientific.net/KEM.883.105}, journal={Key Engineering Materials}, author={Zirngibl, C. and Schleich, B.}, year={2021}, pages={105} }' chicago: 'Zirngibl, C., and B. Schleich. “Approach for the Automated Analysis of Geometrical Clinch Joint Characteristics.” Key Engineering Materials 883 KEM (2021): 105. https://doi.org/10.4028/www.scientific.net/KEM.883.105.' ieee: 'C. Zirngibl and B. Schleich, “Approach for the automated analysis of geometrical clinch joint characteristics,” Key Engineering Materials, vol. 883 KEM, p. 105, 2021, doi: 10.4028/www.scientific.net/KEM.883.105.' mla: Zirngibl, C., and B. Schleich. “Approach for the Automated Analysis of Geometrical Clinch Joint Characteristics.” Key Engineering Materials, vol. 883 KEM, 2021, p. 105, doi:10.4028/www.scientific.net/KEM.883.105. short: C. Zirngibl, B. Schleich, Key Engineering Materials 883 KEM (2021) 105. date_created: 2022-03-29T09:09:51Z date_updated: 2023-01-02T11:51:41Z department: - _id: '630' doi: 10.4028/www.scientific.net/KEM.883.105 language: - iso: eng page: '105' project: - _id: '144' name: 'TRR 285 – B05: TRR 285 - Subproject B05' - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '132' name: 'TRR 285 - B: TRR 285 - Project Area B' publication: Key Engineering Materials status: public title: Approach for the automated analysis of geometrical clinch joint characteristics type: journal_article user_id: '14931' volume: 883 KEM year: '2021' ... --- _id: '34208' abstract: - lang: eng text: Computational homogenization is a powerful tool which allows to obtain homogenized properties of materials on the macroscale from the simulation of the underlying microstructure. The response of the microstructure is, however, strongly affected by variations in the microstructure geometry. The effect of geometry variations is even stronger in cases when the material exhibits plastic deformations. In this work we study a model of a steel alloy with arbitrary distributed elliptic voids. We model one single unit cell of the material containing one single void. The geometry of the void is not precisely known and is modeled as a variable orientation of an ellipse. Large deformations applied to the unit cell necessitate a finite elasto-plastic material model. Since the geometry variation is parameterized, we can utilize the method recently developed for stochastic problems but also applicable to all types of parametric problems — the isoparametric stochastic local FEM (SL-FEM). It is an ideal tool for problems with only a few parameters but strongly nonlinear dependency of the displacement fields on parameters. Simulations demonstrate a strong effect of parameter variation on the plastic strains and, thus, substantiate the use of the parametric computational homogenization approach. author: - first_name: Dmytro full_name: Pivovarov, Dmytro last_name: Pivovarov - first_name: Julia full_name: Mergheim, Julia last_name: Mergheim - first_name: Kai full_name: Willner, Kai last_name: Willner - first_name: Paul full_name: Steinmann, Paul last_name: Steinmann citation: ama: 'Pivovarov D, Mergheim J, Willner K, Steinmann P. Parametric FEM for computational homogenization of heterogeneous materials with random voids. In: PAMM. Vol 20. Wiley; 2021. doi:10.1002/pamm.202000071' apa: Pivovarov, D., Mergheim, J., Willner, K., & Steinmann, P. (2021). Parametric FEM for computational homogenization of heterogeneous materials with random voids. PAMM, 20(1). https://doi.org/10.1002/pamm.202000071 bibtex: '@inproceedings{Pivovarov_Mergheim_Willner_Steinmann_2021, title={Parametric FEM for computational homogenization of heterogeneous materials with random voids}, volume={20}, DOI={10.1002/pamm.202000071}, number={1}, booktitle={PAMM}, publisher={Wiley}, author={Pivovarov, Dmytro and Mergheim, Julia and Willner, Kai and Steinmann, Paul}, year={2021} }' chicago: Pivovarov, Dmytro, Julia Mergheim, Kai Willner, and Paul Steinmann. “Parametric FEM for Computational Homogenization of Heterogeneous Materials with Random Voids.” In PAMM, Vol. 20. Wiley, 2021. https://doi.org/10.1002/pamm.202000071. ieee: 'D. Pivovarov, J. Mergheim, K. Willner, and P. Steinmann, “Parametric FEM for computational homogenization of heterogeneous materials with random voids,” in PAMM, 2021, vol. 20, no. 1, doi: 10.1002/pamm.202000071.' mla: Pivovarov, Dmytro, et al. “Parametric FEM for Computational Homogenization of Heterogeneous Materials with Random Voids.” PAMM, vol. 20, no. 1, Wiley, 2021, doi:10.1002/pamm.202000071. short: 'D. Pivovarov, J. Mergheim, K. Willner, P. Steinmann, in: PAMM, Wiley, 2021.' date_created: 2022-12-05T20:45:22Z date_updated: 2023-01-02T11:52:59Z department: - _id: '630' doi: 10.1002/pamm.202000071 intvolume: ' 20' issue: '1' 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: '139' name: 'TRR 285 – A05: TRR 285 - Subproject A05' publication: PAMM publication_identifier: issn: - 1617-7061 - 1617-7061 publication_status: published publisher: Wiley status: public title: Parametric FEM for computational homogenization of heterogeneous materials with random voids type: conference user_id: '14931' volume: 20 year: '2021' ... --- _id: '34087' author: - first_name: Steffen full_name: Knust, Steffen last_name: Knust - first_name: Lukas full_name: Ruhm, Lukas last_name: Ruhm - first_name: Andreas full_name: Kuhlmann, Andreas last_name: Kuhlmann - first_name: Dennis full_name: Meinderink, Dennis id: '32378' last_name: Meinderink orcid: 0000-0002-2755-6514 - first_name: Julius full_name: Bürger, Julius id: '46952' last_name: Bürger - first_name: Jörg full_name: Lindner, Jörg id: '20797' last_name: Lindner - first_name: Maria Teresa full_name: de los Arcos de Pedro, Maria Teresa id: '54556' last_name: de los Arcos de Pedro - first_name: Guido full_name: Grundmeier, Guido id: '194' last_name: Grundmeier citation: ama: Knust S, Ruhm L, Kuhlmann A, et al. In situ backside Raman spectroscopy of zinc oxide nanorods in an atmospheric‐pressure dielectric barrier discharge plasma. Journal of Raman Spectroscopy. 2021;52(7):1237-1245. doi:10.1002/jrs.6123 apa: Knust, S., Ruhm, L., Kuhlmann, A., Meinderink, D., Bürger, J., Lindner, J., de los Arcos de Pedro, M. T., & Grundmeier, G. (2021). In situ backside Raman spectroscopy of zinc oxide nanorods in an atmospheric‐pressure dielectric barrier discharge plasma. Journal of Raman Spectroscopy, 52(7), 1237–1245. https://doi.org/10.1002/jrs.6123 bibtex: '@article{Knust_Ruhm_Kuhlmann_Meinderink_Bürger_Lindner_de los Arcos de Pedro_Grundmeier_2021, title={In situ backside Raman spectroscopy of zinc oxide nanorods in an atmospheric‐pressure dielectric barrier discharge plasma}, volume={52}, DOI={10.1002/jrs.6123}, number={7}, journal={Journal of Raman Spectroscopy}, publisher={Wiley}, author={Knust, Steffen and Ruhm, Lukas and Kuhlmann, Andreas and Meinderink, Dennis and Bürger, Julius and Lindner, Jörg and de los Arcos de Pedro, Maria Teresa and Grundmeier, Guido}, year={2021}, pages={1237–1245} }' chicago: 'Knust, Steffen, Lukas Ruhm, Andreas Kuhlmann, Dennis Meinderink, Julius Bürger, Jörg Lindner, Maria Teresa de los Arcos de Pedro, and Guido Grundmeier. “In Situ Backside Raman Spectroscopy of Zinc Oxide Nanorods in an Atmospheric‐pressure Dielectric Barrier Discharge Plasma.” Journal of Raman Spectroscopy 52, no. 7 (2021): 1237–45. https://doi.org/10.1002/jrs.6123.' ieee: 'S. Knust et al., “In situ backside Raman spectroscopy of zinc oxide nanorods in an atmospheric‐pressure dielectric barrier discharge plasma,” Journal of Raman Spectroscopy, vol. 52, no. 7, pp. 1237–1245, 2021, doi: 10.1002/jrs.6123.' mla: Knust, Steffen, et al. “In Situ Backside Raman Spectroscopy of Zinc Oxide Nanorods in an Atmospheric‐pressure Dielectric Barrier Discharge Plasma.” Journal of Raman Spectroscopy, vol. 52, no. 7, Wiley, 2021, pp. 1237–45, doi:10.1002/jrs.6123. short: S. Knust, L. Ruhm, A. Kuhlmann, D. Meinderink, J. Bürger, J. Lindner, M.T. de los Arcos de Pedro, G. Grundmeier, Journal of Raman Spectroscopy 52 (2021) 1237–1245. date_created: 2022-11-15T14:08:53Z date_updated: 2023-01-04T14:51:10Z department: - _id: '15' doi: 10.1002/jrs.6123 intvolume: ' 52' issue: '7' keyword: - Spectroscopy - General Materials Science language: - iso: eng page: 1237-1245 publication: Journal of Raman Spectroscopy publication_identifier: issn: - 0377-0486 - 1097-4555 publication_status: published publisher: Wiley status: public title: In situ backside Raman spectroscopy of zinc oxide nanorods in an atmospheric‐pressure dielectric barrier discharge plasma type: journal_article user_id: '77496' volume: 52 year: '2021' ... --- _id: '35303' abstract: - lang: eng text: "Abstract\r\n Purpose\r\n \ Studies about effects of lunch dietary Glycemic Index (GI) on cognition of schoolchildren are scarce. Our previous CogniDo GI study found no changes of cognition in the early postprandial phase after consumption of two rice types with medium vs. high dietary GI for lunch (i.e., 45 min after starting lunch). This study investigated whether the dietary GI of lunch has an impact on cognition of schoolchildren in the late postprandial phase, 90 min after lunch.\r\n \r\n Methods\r\n \ A randomized, 2 × 2 crossover intervention study was conducted at a comprehensive school with 5th and 6th grade students. Participants (n = 212) were randomly assigned to either sequence 1 or 2. In the first period, participants of sequence 1 received a dish with high GI rice (GI: 79), those of sequence 2 with medium GI rice (GI: 64)—in the second period, 1 week later, vice versa. Computer-based cognitive testing was performed 90 min after lunch examining tonic alertness, visual search and task switching, and working memory. Treatment effects and treatment effects adjusted for estimated lunch glycemic load (GL) were analyzed using a linear mixed model.\r\n \r\n Results\r\n \ The selected cognitive parameters were not affected by the GI of lunch 90 min after lunch, neither after intention-to-treat nor in the per-protocol analysis. Adjustment for GL also did not change results.\r\n \ \r\n Conclusion\r\n \ The present study revealed no notable differences after the consumption of two rice types with medium vs. high dietary GI for lunch in children’s cognitive function in the late postprandial phase, 90 min after lunch.\r\n \ \r\n Clinical trial registration\r\n German Clinical Trials Register (DRKS00013597); date of registration: 16/04/2018, retrospectively registered.\r\n \ " author: - first_name: Alina full_name: Drozdowska, Alina last_name: Drozdowska - first_name: Kathrin full_name: Sinningen, Kathrin last_name: Sinningen - first_name: Michael full_name: Falkenstein, Michael last_name: Falkenstein - first_name: Henrik full_name: Rudolf, Henrik last_name: Rudolf - first_name: Lars full_name: Libuda, Lars id: '88682' last_name: Libuda orcid: 0000-0003-1603-3133 - first_name: Anette full_name: Buyken, Anette id: '65985' last_name: Buyken - first_name: Thomas full_name: Lücke, Thomas last_name: Lücke - first_name: Mathilde full_name: Kersting, Mathilde last_name: Kersting citation: ama: 'Drozdowska A, Sinningen K, Falkenstein M, et al. Impact of lunch with carbohydrates differing in glycemic index on children’s cognitive functioning in the late postprandial phase: a randomized crossover study. European Journal of Nutrition. 2021;61(3):1637-1647. doi:10.1007/s00394-021-02766-y' apa: 'Drozdowska, A., Sinningen, K., Falkenstein, M., Rudolf, H., Libuda, L., Buyken, A., Lücke, T., & Kersting, M. (2021). Impact of lunch with carbohydrates differing in glycemic index on children’s cognitive functioning in the late postprandial phase: a randomized crossover study. European Journal of Nutrition, 61(3), 1637–1647. https://doi.org/10.1007/s00394-021-02766-y' bibtex: '@article{Drozdowska_Sinningen_Falkenstein_Rudolf_Libuda_Buyken_Lücke_Kersting_2021, title={Impact of lunch with carbohydrates differing in glycemic index on children’s cognitive functioning in the late postprandial phase: a randomized crossover study}, volume={61}, DOI={10.1007/s00394-021-02766-y}, number={3}, journal={European Journal of Nutrition}, publisher={Springer Science and Business Media LLC}, author={Drozdowska, Alina and Sinningen, Kathrin and Falkenstein, Michael and Rudolf, Henrik and Libuda, Lars and Buyken, Anette and Lücke, Thomas and Kersting, Mathilde}, year={2021}, pages={1637–1647} }' chicago: 'Drozdowska, Alina, Kathrin Sinningen, Michael Falkenstein, Henrik Rudolf, Lars Libuda, Anette Buyken, Thomas Lücke, and Mathilde Kersting. “Impact of Lunch with Carbohydrates Differing in Glycemic Index on Children’s Cognitive Functioning in the Late Postprandial Phase: A Randomized Crossover Study.” European Journal of Nutrition 61, no. 3 (2021): 1637–47. https://doi.org/10.1007/s00394-021-02766-y.' ieee: 'A. Drozdowska et al., “Impact of lunch with carbohydrates differing in glycemic index on children’s cognitive functioning in the late postprandial phase: a randomized crossover study,” European Journal of Nutrition, vol. 61, no. 3, pp. 1637–1647, 2021, doi: 10.1007/s00394-021-02766-y.' mla: 'Drozdowska, Alina, et al. “Impact of Lunch with Carbohydrates Differing in Glycemic Index on Children’s Cognitive Functioning in the Late Postprandial Phase: A Randomized Crossover Study.” European Journal of Nutrition, vol. 61, no. 3, Springer Science and Business Media LLC, 2021, pp. 1637–47, doi:10.1007/s00394-021-02766-y.' short: A. Drozdowska, K. Sinningen, M. Falkenstein, H. Rudolf, L. Libuda, A. Buyken, T. Lücke, M. Kersting, European Journal of Nutrition 61 (2021) 1637–1647. date_created: 2023-01-05T14:49:10Z date_updated: 2023-01-05T16:47:16Z department: - _id: '35' - _id: '17' - _id: '22' - _id: '571' - _id: '395' doi: 10.1007/s00394-021-02766-y intvolume: ' 61' issue: '3' keyword: - Nutrition and Dietetics - Medicine (miscellaneous) language: - iso: eng page: 1637-1647 publication: European Journal of Nutrition publication_identifier: issn: - 1436-6207 - 1436-6215 publication_status: published publisher: Springer Science and Business Media LLC status: public title: 'Impact of lunch with carbohydrates differing in glycemic index on children''s cognitive functioning in the late postprandial phase: a randomized crossover study' type: journal_article user_id: '61597' volume: 61 year: '2021' ... --- _id: '35320' author: - first_name: Joern Steffen full_name: Menzefricke, Joern Steffen last_name: Menzefricke - first_name: Ingrid full_name: Wiederkehr, Ingrid last_name: Wiederkehr - first_name: Christian full_name: Koldewey, Christian last_name: Koldewey - first_name: Roman full_name: Dumitrescu, Roman last_name: Dumitrescu citation: ama: 'Menzefricke JS, Wiederkehr I, Koldewey C, Dumitrescu R. Maturity-based Development of Strategic Thrusts for Socio-technical Risks. In: Procedia CIRP. Vol 104. Elsevier BV; 2021:241-246. doi:10.1016/j.procir.2021.11.041' apa: Menzefricke, J. S., Wiederkehr, I., Koldewey, C., & Dumitrescu, R. (2021). Maturity-based Development of Strategic Thrusts for Socio-technical Risks. Procedia CIRP, 104, 241–246. https://doi.org/10.1016/j.procir.2021.11.041 bibtex: '@inproceedings{Menzefricke_Wiederkehr_Koldewey_Dumitrescu_2021, title={Maturity-based Development of Strategic Thrusts for Socio-technical Risks}, volume={104}, DOI={10.1016/j.procir.2021.11.041}, booktitle={Procedia CIRP}, publisher={Elsevier BV}, author={Menzefricke, Joern Steffen and Wiederkehr, Ingrid and Koldewey, Christian and Dumitrescu, Roman}, year={2021}, pages={241–246} }' chicago: Menzefricke, Joern Steffen, Ingrid Wiederkehr, Christian Koldewey, and Roman Dumitrescu. “Maturity-Based Development of Strategic Thrusts for Socio-Technical Risks.” In Procedia CIRP, 104:241–46. Elsevier BV, 2021. https://doi.org/10.1016/j.procir.2021.11.041. ieee: 'J. S. Menzefricke, I. Wiederkehr, C. Koldewey, and R. Dumitrescu, “Maturity-based Development of Strategic Thrusts for Socio-technical Risks,” in Procedia CIRP, 2021, vol. 104, pp. 241–246, doi: 10.1016/j.procir.2021.11.041.' mla: Menzefricke, Joern Steffen, et al. “Maturity-Based Development of Strategic Thrusts for Socio-Technical Risks.” Procedia CIRP, vol. 104, Elsevier BV, 2021, pp. 241–46, doi:10.1016/j.procir.2021.11.041. short: 'J.S. Menzefricke, I. Wiederkehr, C. Koldewey, R. Dumitrescu, in: Procedia CIRP, Elsevier BV, 2021, pp. 241–246.' date_created: 2023-01-06T07:53:47Z date_updated: 2023-01-06T07:54:36Z doi: 10.1016/j.procir.2021.11.041 intvolume: ' 104' keyword: - General Medicine language: - iso: eng page: 241-246 publication: Procedia CIRP publication_identifier: issn: - 2212-8271 publication_status: published publisher: Elsevier BV status: public title: Maturity-based Development of Strategic Thrusts for Socio-technical Risks type: conference user_id: '29799' volume: 104 year: '2021' ...