--- _id: '64251' abstract: - lang: eng text: "ABSTRACT\r\n Clinching is a widely adopted joining technique in the automotive industry, enabling the fabrication of lightweight structures from dissimilar sheet materials. Accurate prediction of the fatigue life of clinched joints is essential for ensuring structural safety and minimizing development costs. However, full 3D fatigue simulations over millions of cycles are computationally intensive due to the complexity of contact mechanics. This study introduces a 2D numerical model that circumvents direct contact modeling by applying a slip condition at the sheet interface, significantly reducing computational demands. A micro‐slip friction model is used to represent the mechanical interface behavior, while a two‐scale damage model captures the fatigue damage evolution. The model is validated against experimental data and used to investigate the influence of friction coefficient and tangential contact stiffness on fatigue life, highlighting its efficiency and predictive capability." article_number: e70035 author: - first_name: Chin full_name: Chen, Chin id: '114741' last_name: Chen - first_name: Martin full_name: Hofmann, Martin last_name: Hofmann - first_name: Thomas full_name: Wallmersperger, Thomas last_name: Wallmersperger citation: ama: Chen C, Hofmann M, Wallmersperger T. A 2D Approach to Predict the High‐Cycle Fatigue Life of Clinched Joints. PAMM. 2026;26(1). doi:10.1002/pamm.70035 apa: Chen, C., Hofmann, M., & Wallmersperger, T. (2026). A 2D Approach to Predict the High‐Cycle Fatigue Life of Clinched Joints. PAMM, 26(1), Article e70035. https://doi.org/10.1002/pamm.70035 bibtex: '@article{Chen_Hofmann_Wallmersperger_2026, title={A 2D Approach to Predict the High‐Cycle Fatigue Life of Clinched Joints}, volume={26}, DOI={10.1002/pamm.70035}, number={1e70035}, journal={PAMM}, publisher={Wiley}, author={Chen, Chin and Hofmann, Martin and Wallmersperger, Thomas}, year={2026} }' chicago: Chen, Chin, Martin Hofmann, and Thomas Wallmersperger. “A 2D Approach to Predict the High‐Cycle Fatigue Life of Clinched Joints.” PAMM 26, no. 1 (2026). https://doi.org/10.1002/pamm.70035. ieee: 'C. Chen, M. Hofmann, and T. Wallmersperger, “A 2D Approach to Predict the High‐Cycle Fatigue Life of Clinched Joints,” PAMM, vol. 26, no. 1, Art. no. e70035, 2026, doi: 10.1002/pamm.70035.' mla: Chen, Chin, et al. “A 2D Approach to Predict the High‐Cycle Fatigue Life of Clinched Joints.” PAMM, vol. 26, no. 1, e70035, Wiley, 2026, doi:10.1002/pamm.70035. short: C. Chen, M. Hofmann, T. Wallmersperger, PAMM 26 (2026). date_created: 2026-02-19T10:03:06Z date_updated: 2026-02-24T15:10:04Z doi: 10.1002/pamm.70035 intvolume: ' 26' issue: '1' language: - iso: eng project: - _id: '142' name: TRR 285 - Subproject B03 - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' - _id: '132' name: TRR 285 - Project Area B publication: PAMM publication_identifier: issn: - 1617-7061 - 1617-7061 publication_status: published publisher: Wiley status: public title: A 2D Approach to Predict the High‐Cycle Fatigue Life of Clinched Joints type: journal_article user_id: '114741' volume: 26 year: '2026' ... --- _id: '64250' abstract: - lang: eng text: "Abstract\r\n Salt-spray testing is widely used in the automotive and materials industries to assess the corrosion resistance of protective coatings, where uniform corrosion is a key indicator of material performance. This work presents a numerical uniform corrosion model that predicts the corrosion rate of hot-dip zinc in salt-spray environments by incorporating electrochemical reactions, mass transport via the Nernst–Planck equation, and ionic-strength effects through the Brønsted–Bjerrum relation. The model is calibrated using immersion-test data and extended to account for electrolyte layer growth, droplet deposition, and periodic run-off in salt-spray environments. The calibration establishes a relationship between the porosity of the zinc oxide layer and the rate constant of zinc oxide precipitation. The validated model reproduces the transition from activation- to diffusion-controlled corrosion and captures the experimentally observed corrosion kinetics with an error margin of 20% when electrolyte renewal is included. The results highlight the decisive role of electrolyte dynamics in salt-spray environments and provide a foundation for extending the framework to more complex cyclic corrosion tests." author: - first_name: Chin full_name: Chen, Chin id: '114741' last_name: Chen - first_name: Martin full_name: Hofmann, Martin last_name: Hofmann - first_name: Thomas full_name: Wallmersperger, Thomas last_name: Wallmersperger citation: ama: Chen C, Hofmann M, Wallmersperger T. Modeling the uniform corrosion behavior of zinc in salt spray testing. npj Materials Degradation. Published online 2026. doi:10.1038/s41529-026-00749-0 apa: Chen, C., Hofmann, M., & Wallmersperger, T. (2026). Modeling the uniform corrosion behavior of zinc in salt spray testing. Npj Materials Degradation. https://doi.org/10.1038/s41529-026-00749-0 bibtex: '@article{Chen_Hofmann_Wallmersperger_2026, title={Modeling the uniform corrosion behavior of zinc in salt spray testing}, DOI={10.1038/s41529-026-00749-0}, journal={npj Materials Degradation}, publisher={Springer Science and Business Media LLC}, author={Chen, Chin and Hofmann, Martin and Wallmersperger, Thomas}, year={2026} }' chicago: Chen, Chin, Martin Hofmann, and Thomas Wallmersperger. “Modeling the Uniform Corrosion Behavior of Zinc in Salt Spray Testing.” Npj Materials Degradation, 2026. https://doi.org/10.1038/s41529-026-00749-0. ieee: 'C. Chen, M. Hofmann, and T. Wallmersperger, “Modeling the uniform corrosion behavior of zinc in salt spray testing,” npj Materials Degradation, 2026, doi: 10.1038/s41529-026-00749-0.' mla: Chen, Chin, et al. “Modeling the Uniform Corrosion Behavior of Zinc in Salt Spray Testing.” Npj Materials Degradation, Springer Science and Business Media LLC, 2026, doi:10.1038/s41529-026-00749-0. short: C. Chen, M. Hofmann, T. Wallmersperger, Npj Materials Degradation (2026). date_created: 2026-02-19T10:02:29Z date_updated: 2026-02-24T15:10:55Z doi: 10.1038/s41529-026-00749-0 language: - iso: eng project: - _id: '142' name: TRR 285 - Subproject B03 - _id: '132' name: TRR 285 - Project Area B - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' publication: npj Materials Degradation publication_identifier: issn: - 2397-2106 publication_status: published publisher: Springer Science and Business Media LLC status: public title: Modeling the uniform corrosion behavior of zinc in salt spray testing type: journal_article user_id: '114741' year: '2026' ... --- _id: '61161' abstract: - lang: eng text: "Abstract\r\n The effects of corrosion on clinched joints are not completely understood yet. Recent research indicates that galvanic corrosion can actually enhance the fatigue life of clinched joints. It is then of significant interest to investigate the effects of another corrosion phenomenon, pitting corrosion, on the fatigue behavior of clinched joints. Pitting corrosion occurs in passive metals and can lead to stress concentrations. In the present study, the effects of pitting corrosion are investigated by using Lemaitre’s two-scale fatigue model with a 2D geometry of clinched joints. A slip condition is applied as a boundary condition to simplify the clinched joint model and reduce the computational cost of solving the contact mechanics problem. Additionally, a method to determine the damage strength and the damage exponent used in the two-scale damage model is introduced. Numerical simulations reveal that pitting corrosion reduces the fatigue life of clinched joints, particularly when it occurs on the internal surface in the neck area." author: - first_name: Chin full_name: Chen, Chin id: '114741' last_name: Chen - first_name: Sven full_name: Harzheim, Sven last_name: Harzheim - first_name: Martin full_name: Hofmann, Martin last_name: Hofmann - first_name: Thomas full_name: Wallmersperger, Thomas last_name: Wallmersperger citation: ama: Chen C, Harzheim S, Hofmann M, Wallmersperger T. Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints. Acta Mechanica. Published online 2025. doi:10.1007/s00707-025-04234-8 apa: Chen, C., Harzheim, S., Hofmann, M., & Wallmersperger, T. (2025). Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints. Acta Mechanica. https://doi.org/10.1007/s00707-025-04234-8 bibtex: '@article{Chen_Harzheim_Hofmann_Wallmersperger_2025, title={Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints}, DOI={10.1007/s00707-025-04234-8}, journal={Acta Mechanica}, publisher={Springer Science and Business Media LLC}, author={Chen, Chin and Harzheim, Sven and Hofmann, Martin and Wallmersperger, Thomas}, year={2025} }' chicago: Chen, Chin, Sven Harzheim, Martin Hofmann, and Thomas Wallmersperger. “Numerical Investigation of the Effects of Pitting Corrosion on High-Cycle Fatigue of Clinched Joints.” Acta Mechanica, 2025. https://doi.org/10.1007/s00707-025-04234-8. ieee: 'C. Chen, S. Harzheim, M. Hofmann, and T. Wallmersperger, “Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints,” Acta Mechanica, 2025, doi: 10.1007/s00707-025-04234-8.' mla: Chen, Chin, et al. “Numerical Investigation of the Effects of Pitting Corrosion on High-Cycle Fatigue of Clinched Joints.” Acta Mechanica, Springer Science and Business Media LLC, 2025, doi:10.1007/s00707-025-04234-8. short: C. Chen, S. Harzheim, M. Hofmann, T. Wallmersperger, Acta Mechanica (2025). date_created: 2025-09-10T07:52:43Z date_updated: 2026-02-24T15:11:39Z doi: 10.1007/s00707-025-04234-8 language: - iso: eng project: - _id: '142' name: TRR 285 - Subproject B03 - _id: '132' name: TRR 285 - Project Area B - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' publication: Acta Mechanica publication_identifier: issn: - 0001-5970 - 1619-6937 publication_status: published publisher: Springer Science and Business Media LLC status: public title: Numerical investigation of the effects of pitting corrosion on high-cycle fatigue of clinched joints type: journal_article user_id: '114741' year: '2025' ... --- _id: '61411' abstract: - lang: eng text: "Abstract\r\n The effect of corrosion on mechanically joined components is not well understood. While recent research shows that a brief exposure of clinched specimens to a salt spray environment improves the specimens’ fatigue life, other research shows a decrease in load bearing capabilities with increasing corrosion times. These studies primarily focus on galvanic corrosion. It is not entirely clear how other corrosion phenomena, such as pitting corrosion, affect the fatigue life of clinched joints. In this work, a numerical model is used, which is able to simulate corrosion pit growth in EN AW-6014. The experimental polarization data of EN AW-6014 are used directly in the calculation of the interface kinetics parameter of the model." author: - first_name: Sven full_name: Harzheim, Sven last_name: Harzheim - first_name: Chin full_name: Chen, Chin id: '114741' last_name: Chen - first_name: Katharina full_name: Hollmer, Katharina last_name: Hollmer - first_name: Martin full_name: Hofmann, Martin last_name: Hofmann - first_name: Martina full_name: Zimmermann, Martina last_name: Zimmermann - first_name: Thomas full_name: Wallmersperger, Thomas last_name: Wallmersperger citation: ama: Harzheim S, Chen C, Hollmer K, Hofmann M, Zimmermann M, Wallmersperger T. Numerical investigation of pitting corrosion in clinched joints. Acta Mechanica. Published online 2025. doi:10.1007/s00707-025-04248-2 apa: Harzheim, S., Chen, C., Hollmer, K., Hofmann, M., Zimmermann, M., & Wallmersperger, T. (2025). Numerical investigation of pitting corrosion in clinched joints. Acta Mechanica. https://doi.org/10.1007/s00707-025-04248-2 bibtex: '@article{Harzheim_Chen_Hollmer_Hofmann_Zimmermann_Wallmersperger_2025, title={Numerical investigation of pitting corrosion in clinched joints}, DOI={10.1007/s00707-025-04248-2}, journal={Acta Mechanica}, publisher={Springer Science and Business Media LLC}, author={Harzheim, Sven and Chen, Chin and Hollmer, Katharina and Hofmann, Martin and Zimmermann, Martina and Wallmersperger, Thomas}, year={2025} }' chicago: Harzheim, Sven, Chin Chen, Katharina Hollmer, Martin Hofmann, Martina Zimmermann, and Thomas Wallmersperger. “Numerical Investigation of Pitting Corrosion in Clinched Joints.” Acta Mechanica, 2025. https://doi.org/10.1007/s00707-025-04248-2. ieee: 'S. Harzheim, C. Chen, K. Hollmer, M. Hofmann, M. Zimmermann, and T. Wallmersperger, “Numerical investigation of pitting corrosion in clinched joints,” Acta Mechanica, 2025, doi: 10.1007/s00707-025-04248-2.' mla: Harzheim, Sven, et al. “Numerical Investigation of Pitting Corrosion in Clinched Joints.” Acta Mechanica, Springer Science and Business Media LLC, 2025, doi:10.1007/s00707-025-04248-2. short: S. Harzheim, C. Chen, K. Hollmer, M. Hofmann, M. Zimmermann, T. Wallmersperger, Acta Mechanica (2025). date_created: 2025-09-23T11:58:18Z date_updated: 2026-02-24T15:12:17Z doi: 10.1007/s00707-025-04248-2 language: - iso: eng project: - _id: '132' name: TRR 285 - Project Area B - _id: '142' name: TRR 285 - Subproject B03 - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' publication: Acta Mechanica publication_identifier: issn: - 0001-5970 - 1619-6937 publication_status: published publisher: Springer Science and Business Media LLC status: public title: Numerical investigation of pitting corrosion in clinched joints type: journal_article user_id: '114741' year: '2025' ... --- _id: '61412' abstract: - lang: eng text: 'AbstractMechanical clinching is a frequently used joining method for technical components. These joints are usually weak spots. Here, corrosion and fatigue are decisive influencing factors for the assessment of the service life of such joints. Corrosion generally leads to material deterioration and thus to premature failure of the joints. Under certain circumstances, however, corrosion can lead to an increased fatigue life. While this effect has not yet been fully understood, the present work provides a possible explanation and a modeling approach to predict the fatigue life of precorroded clinched joints. The increased fatigue life is observed when the clinched components are briefly (up to 3 weeks) exposed to a salt spray environment. During this time, a small layer of corrosion products protrudes from the metal surface and fills the gaps between the joined sheets. Due to the increased contact area, the mechanical stress in the joint decreases, resulting in an improved fatigue performance. Although there are a variety of corrosion phenomena, for example, pitting, intergranular, and transgranular corrosion as well as galvanic corrosion, experimental studies indicate that galvanic corrosion is the main contributor of this effect. In the present work, a coupled electro‐chemo‐mechanical corrosion model is presented and applied to two test cases. Case I: corrosion products growth, and Case II: corrosion products growth and mechanical loading.' article_number: e202400028 author: - first_name: Sven full_name: Harzheim, Sven last_name: Harzheim - first_name: Chin full_name: Chen, Chin id: '114741' last_name: Chen - first_name: Martin full_name: Hofmann, Martin last_name: Hofmann - first_name: Thomas full_name: Wallmersperger, Thomas last_name: Wallmersperger citation: ama: Harzheim S, Chen C, Hofmann M, Wallmersperger T. Coupled chemo‐electro‐mechanical model for galvanic corrosion in clinched components. PAMM. 2024;24(4). doi:10.1002/pamm.202400028 apa: Harzheim, S., Chen, C., Hofmann, M., & Wallmersperger, T. (2024). Coupled chemo‐electro‐mechanical model for galvanic corrosion in clinched components. PAMM, 24(4), Article e202400028. https://doi.org/10.1002/pamm.202400028 bibtex: '@article{Harzheim_Chen_Hofmann_Wallmersperger_2024, title={Coupled chemo‐electro‐mechanical model for galvanic corrosion in clinched components}, volume={24}, DOI={10.1002/pamm.202400028}, number={4e202400028}, journal={PAMM}, publisher={Wiley}, author={Harzheim, Sven and Chen, Chin and Hofmann, Martin and Wallmersperger, Thomas}, year={2024} }' chicago: Harzheim, Sven, Chin Chen, Martin Hofmann, and Thomas Wallmersperger. “Coupled Chemo‐electro‐mechanical Model for Galvanic Corrosion in Clinched Components.” PAMM 24, no. 4 (2024). https://doi.org/10.1002/pamm.202400028. ieee: 'S. Harzheim, C. Chen, M. Hofmann, and T. Wallmersperger, “Coupled chemo‐electro‐mechanical model for galvanic corrosion in clinched components,” PAMM, vol. 24, no. 4, Art. no. e202400028, 2024, doi: 10.1002/pamm.202400028.' mla: Harzheim, Sven, et al. “Coupled Chemo‐electro‐mechanical Model for Galvanic Corrosion in Clinched Components.” PAMM, vol. 24, no. 4, e202400028, Wiley, 2024, doi:10.1002/pamm.202400028. short: S. Harzheim, C. Chen, M. Hofmann, T. Wallmersperger, PAMM 24 (2024). date_created: 2025-09-23T11:58:43Z date_updated: 2026-02-24T15:12:47Z doi: 10.1002/pamm.202400028 intvolume: ' 24' issue: '4' language: - iso: eng project: - _id: '132' name: TRR 285 - Project Area B - _id: '142' name: TRR 285 - Subproject B03 - _id: '130' name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten' publication: PAMM publication_identifier: issn: - 1617-7061 - 1617-7061 publication_status: published publisher: Wiley status: public title: Coupled chemo‐electro‐mechanical model for galvanic corrosion in clinched components type: journal_article user_id: '114741' volume: 24 year: '2024' ...