Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

2015, Volume 9, Issue 4

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Frontiers of Structural and Civil Engineering >> 2015, Volume 9, Issue 4 doi: 10.1007/s11709-015-0305-y

Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India

Accepted: 2015-11-20 Available online: 2015-11-26

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Abstract

In this paper, elasto-plastic XFEM simulations have been performed to evaluate the fatigue life of plane crack problems in the presence of various defects. The stress-strain response of the material is modeled by Ramberg-Osgood equation. The von-Mises failure criterion has been used with isotropic hardening. The -integral for two fracture modes (mode-I and mode-II) is obtained by decomposing the displacement and stress fields into their symmetric and antisymmetric parts, then individual stress intensity factors are extracted from -integral. The fatigue life obtained by EPFM is found quite close to that obtained by LEFM.

Keywords

XFEM ; von-Mises yield criterion ; isotropic hardening ; fatigue crack growth ; J-integral

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