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Fatigue crack growth modelling considering a damage regularization approach
  • E.R. Sérgio,
  • Fernando Antunes,
  • Diogo Neto
E.R. Sérgio
Universidade de Coimbra

Corresponding Author:[email protected]

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Fernando Antunes
Universidade de Coimbra
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Diogo Neto
Universidade de Coimbra
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Abstract

An integral regularization method was applied to the Gurson-Tvergaard-Needleman (GTN) damage model to address the plastic deformation localization at the crack tip. The parameters for the constitutive model were calibrated with an evolutionary algorithm. The model was applied to predict ductile fracture of a tensile specimen, allowing mesh convergence and geometry independence. Fatigue crack growth was predicted through a node release strategy, obtaining a very good approximation to the experimental results in the upper part of the Paris Regime. Mesh independence was verified for medium/high Δ K  levels, but near the threshold regime no mesh independence was obtained and da/dN was overestimated. The characteristic length for the non-local model was defined as the reverse plastic zone size, which indicates that this should be the fatigue process zone. Finally, at the accelerated regime, final fracture loci predictions agree with the experimental results, but mesh independence was barely achieved.
30 Jun 2023Submitted to Fatigue & Fracture of Engineering Materials & Structures
30 Jun 2023Submission Checks Completed
30 Jun 2023Assigned to Editor
03 Jul 2023Reviewer(s) Assigned
13 Aug 2023Review(s) Completed, Editorial Evaluation Pending
14 Aug 2023Editorial Decision: Revise Major
18 Oct 20231st Revision Received
18 Oct 2023Submission Checks Completed
18 Oct 2023Assigned to Editor
19 Oct 2023Reviewer(s) Assigned
19 Nov 2023Review(s) Completed, Editorial Evaluation Pending
22 Nov 2023Editorial Decision: Revise Major