Journal Title
Title of Journal: J Inst Eng India Ser C
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Abbravation: Journal of The Institution of Engineers (India): Series C
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Authors: Himanshu Pathak Akhilendra Singh Indra Vir Singh
Publish Date: 2016/06/17
Volume: 98, Issue: 3, Pages: 295-312
Abstract
In this work finite element method FEM and element free Galerkin method EFGM are coupled for solving 3D crack domains subjected to cyclic thermal load of constant amplitude Crack growth contours and fatigue life have been obtained for each of the considered numerical examples Thermoelastic problems are decoupled into thermal and elastic problems Firstly the unknown temperature field is obtained by solving heat conduction equation then it is used as the input load in the elastic problem to calculate the displacement and stress fields The geometrical discontinuity across crack surface is modelled by extrinsically enriched EFGM and the remaining part of the domain is approximated by standard finite element method At the crack interface a ramp function based interpolation scheme has been implemented This coupled approach combines the advantages of both EFGM and FEM A linear successive crack increment approach is used to model crack growth The growing crack surface is traced by level set function Standard Paris law is used for life estimation of the threedimensional crack models Different cases of planar and nonplanar crack problems have been solved and their results are compared with the results obtained using extended finite element method to check accuracy efficiency and robustness of the coupled FEEFG approach implemented in this study
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