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Influence of pre-strain and bake hardening on the static and fatigue strength of a DP600 steel sheet
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  • Andrea Kusch,
  • Daniele Crivelli,
  • Luca Diviani,
  • Matteo Dotta,
  • Simone Salamina,
  • Filippo Berto
Andrea Kusch
Scuola universitaria professionale della Svizzera italiana Dipartimento tecnologie innovative
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Daniele Crivelli
Scuola universitaria professionale della Svizzera italiana Dipartimento tecnologie innovative
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Luca Diviani
Scuola universitaria professionale della Svizzera italiana Dipartimento tecnologie innovative
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Matteo Dotta
Scuola universitaria professionale della Svizzera italiana Dipartimento tecnologie innovative
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Simone Salamina
Scuola universitaria professionale della Svizzera italiana Dipartimento tecnologie innovative

Corresponding Author:simone.salamina@supsi.ch

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Filippo Berto
Universita degli Studi di Roma La Sapienza Dipartimento di Ingegneria Chimica Materiali Ambiente
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Abstract

The influence of pre-strain on the tensile and fatigue properties of a dual phase DP600 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 which 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 tensile mean stress. In low cycle fatigue, negligible influence of pre-strain was observed due to cyclic softening and residual stress relaxation.
01 Mar 2023Submitted to Fatigue & Fracture of Engineering Materials & Structures
01 Mar 2023Submission Checks Completed
01 Mar 2023Assigned to Editor
04 Mar 2023Reviewer(s) Assigned
05 Apr 2023Review(s) Completed, Editorial Evaluation Pending
27 Apr 2023Editorial Decision: Revise Major
13 Jun 20231st Revision Received
14 Jun 2023Submission Checks Completed
14 Jun 2023Assigned to Editor
15 Jun 2023Reviewer(s) Assigned
16 Jun 2023Review(s) Completed, Editorial Evaluation Pending
18 Jun 2023Editorial Decision: Accept