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Crack propagation in a Gurson ductile material using X-FEM

Abstract : The present work aims at reproducing numerically the crack propagation in engineering materials whose failure results from void initiation, growth and coalescence. With this aim in view, a methodology is proposed combining a modified Gurson based, finite strain, (ductile) damage-(visco)plasticity coupled constitutive model and the eXtended Finite Element Method (X-FEM), both implemented as user subroutines (umat and uel respectively) into the engineering finite element computation code Abaqus. The GTN model version considered in the present work has been proposed by Longère et al. [1] to reproduce the void growth induced damage in shear, in addition to the combined effects of strain hardening, thermal softening and viscoplasticity. Concerning the X-FEM formulation, the technique consisting in increasing significantly the number of integration points, see Elguedj et al. [2], of the original finite element has been retained here to capture the crack propagation. To attenuate the mesh dependence, the indicator of the transition from continuous damage to crack formation considers quantities averaging over an area (a patch) located at the crack tip, as applied by Haboussa et al. [3]. The crack is assumed here to initiate as soon as an averaged, stored energy related quantity around the crack tip reaches a critical value. In the line of the works by Huespe et al. [4],
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Contributor : Jean-Philippe Crété Connect in order to contact the contributor
Submitted on : Friday, February 22, 2019 - 11:01:15 AM
Last modification on : Tuesday, October 19, 2021 - 11:17:30 PM


  • HAL Id : hal-02018622, version 1


Jean-Philippe Crété, Patrice Longère, Jean-Marc Cadou, Johannes Wolf. Crack propagation in a Gurson ductile material using X-FEM. 5th. European Conference on Computational Mechanics, Sep 2014, Barcelone, Spain. ⟨hal-02018622⟩



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