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The effect of residual stress on mixed-mode crack propagation behavior in friction stir welded 7075-T6 aluminum alloy panel under biaxial loading
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  • Xiushuo Zhang,
  • Yu E Ma,
  • Zhenhai Wang,
  • Yanning Guo
Xiushuo Zhang
Northwestern Polytechnical University
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Yu E Ma
Northwestern Polytechnical University School of Aeronautics
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Zhenhai Wang
Northwestern Polytechnical University
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Yanning Guo
Northwestern Polytechnical University School of Aeronautics
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Abstract

In this work, the effect of residual stress on mixed-mode crack propagation behavior in friction stir welded (FSW) 7075-T6 panel under biaxial loading was investigated. The cruciform sample was designed and manufactured by FSW. Residual stress profiles across the welded sample were measured by the X-ray diffraction technique. Crack propagation behaviors were simulated with five different biaxial loading ratios. Stress intensity factors (KΙ and KΙΙ) were evaluated by finite element method (FEM) and used to study the effects of residual stress on crack behaviors. It was observed that residual stress has a considerable effect on the mixed-mode crack growth. In most of the cases, the crack deflection is mainly affected by residual stress at the beginning of crack propagation. The variation of crack propagation path is strongly linked with the residual stress as well as the biaxial loading ratio. In addition, KΙ and KΙΙ are susceptible to residual stress under biaxial loading conditions. Residual stresses contribute to a higher proportion of KΙΙ compared to that of KΙ. KΙ and KΙΙ in the retreating side are more affected by the residual stress.

Peer review status:ACCEPTED

19 Oct 2020Submitted to Fatigue & Fracture of Engineering Materials & Structures
19 Oct 2020Submission Checks Completed
19 Oct 2020Assigned to Editor
21 Oct 2020Reviewer(s) Assigned
30 Oct 2020Review(s) Completed, Editorial Evaluation Pending
09 Nov 2020Editorial Decision: Revise Major
17 Nov 20201st Revision Received
18 Nov 2020Submission Checks Completed
18 Nov 2020Assigned to Editor
18 Nov 2020Reviewer(s) Assigned
18 Nov 2020Review(s) Completed, Editorial Evaluation Pending
22 Nov 2020Editorial Decision: Accept