Kusch, Andrea and Crivelli, Daniele and Diviani, Luca and Dotta, Matteo and Salamina, Simone and Berto, Filippo (2023) Influence of pre‐strain and bake hardening on the static and fatigue strength of a DP600 steel sheet. Fatigue & Fracture of Engineering Materials & Structures. ISSN 8756-758X
Full text not available from this repository.Abstract
The influence of pre-strain on the tensile and fatigue properties of a dual phase DP600 steel was studied. The material was pre-strained by uni-axial tension in rolling and transverse direction. Thereafter, specimens were cut from the deformed plates in parallel or orthogonal to pre-strain direction. It was found that pre-strain increases yield and tensile strength. Results suggested that strain path change primarily affects the elastic-plastic transition during early stage of reloading. Pre-strained specimens showed an increase in high cycle regimes as a consequence of yield strength increment, irrespective of imposed pre-straining direction. A modified stress life equation that accounts for pre-strain was proposed and showed good agreement with experimental data. Bake hardening enhanced both tensile and high cycle fatigue resistance. Walker equation was successfully fitted to account for tensile mean stress. In low cycle fatigue, negligible influence of pre-strain was observed due to cyclic softening and residual stress relaxation.
| Item Type: | Scientific journal article, Newspaper article or Magazine article |
|---|---|
| Subjects: | Engineering > Mechanical engineering |
| Department/unit: | Dipartimento tecnologie innovative > Istituto di ingegneria meccanica e tecnologia dei materiali |
| Depositing User: | Andrea Kusch |
| Date Deposited: | 17 Jul 2023 05:37 |
| Last Modified: | 17 Jul 2023 05:43 |
| URI: | http://repository.supsi.ch/id/eprint/14137 |
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