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Fatigue crack growth modelling considering a hybrid propagation strategy
  • E.R. Sérgio,
  • Fernando Antunes,
  • Diogo Neto
E.R. Sérgio
Universidade de Coimbra Departamento de Engenharia Mecanica

Corresponding Author:edmundo.sergio@uc.pt

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Fernando Antunes
Universidade de Coimbra Departamento de Engenharia Mecanica
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Diogo Neto
Universidade de Coimbra Departamento de Engenharia Mecanica
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Abstract

Fatigue results from the occurrence of several damage mechanisms and their interactions. The cyclic plastic strain and damage accumulation at the crack tip are widely pointed as the main agents behind FCG. In this work, the authors propose the prediction of FCG through a node release numerical model that offers several possibilities regarding the modelling of the mechanisms behind fatigue. A hybrid propagation method is presented where both cumulative plastic strain and porous damage represent parallel propagation criteria. Accordingly, the node is released once either a critical plastic strain or a critical porosity, at the crack tip, is reached. The Gurson-Tvergaard-Needleman (GTN) damage model is employed to predict porous damage evolution through the processes of nucleation and growth of microvoids. The model is validated through comparison with experimental data. Finally, the interactions between plastic strain, porous damage, crack closure and stress triaxiality are accessed.
17 Oct 2022Submitted to Fatigue & Fracture of Engineering Materials & Structures
17 Oct 2022Submission Checks Completed
17 Oct 2022Assigned to Editor
27 Oct 2022Reviewer(s) Assigned
29 Nov 2022Review(s) Completed, Editorial Evaluation Pending
02 Dec 2022Editorial Decision: Revise Minor
13 Dec 20221st Revision Received
13 Dec 2022Submission Checks Completed
13 Dec 2022Assigned to Editor
16 Dec 2022Reviewer(s) Assigned
06 Jan 2023Review(s) Completed, Editorial Evaluation Pending
10 Jan 2023Editorial Decision: Accept