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Differences in fatigue crack growth between L-T and S-T orientations in an aluminium 7050-T7451 plate
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  • Antunes FV,
  • M.F. Borges,
  • Jesus J,
  • Ricardo Branco,
  • Prates P,
  • Diogo Neto
Antunes FV
Universidade de Coimbra Departamento de Engenharia Mecanica

Corresponding Author:uc5161@dem.uc.pt

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M.F. Borges
Universidade de Coimbra Departamento de Engenharia Mecanica
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Jesus J
Universidade de Coimbra Departamento de Engenharia Mecanica
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Ricardo Branco
Universidade de Coimbra Departamento de Engenharia Mecanica
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Prates P
Universidade de Aveiro Centro de Tecnologia Mecanica e Automacao
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Diogo Neto
Universidade de Coimbra Departamento de Engenharia Mecanica
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Abstract

This study is focused on the anisotropic fatigue crack growth (FCG) behaviour of an aluminium AA7050-T7451 plate. L-T and S-T orientations were studied in M(T) samples with W=50 mm, in mode I loading, with R-ratio of +0.05. A numerical approach was used, assuming that crack tip plastic strain is the crack driving force. A purely kinematic elastic-plastic model was calibrated using experimental data from low cycle fatigue tests of smooth specimens in L and S orientations. The predicted FCG rates agree well with experimental trends in the Paris’ regime, suggesting that cyclic plastic deformation is the main damage mechanism. The numerical model was used to estimate the stress ratio effect for both orientations, which was found to be linked with crack closure variations. However, the closure free predicted trends for both microstructural orientations at R=0.05 are not overlapped, suggesting an effect of microstructure not linked to crack closure.
21 Mar 2023Submitted to Fatigue & Fracture of Engineering Materials & Structures
21 Mar 2023Submission Checks Completed
21 Mar 2023Assigned to Editor
21 Mar 2023Reviewer(s) Assigned
13 Apr 2023Review(s) Completed, Editorial Evaluation Pending
16 Apr 2023Editorial Decision: Revise Major
26 Apr 20231st Revision Received
27 Apr 2023Submission Checks Completed
27 Apr 2023Assigned to Editor
27 Apr 2023Reviewer(s) Assigned
27 Apr 2023Review(s) Completed, Editorial Evaluation Pending
15 May 2023Editorial Decision: Accept