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Indexed by:期刊论文

Date of Publication:2012-08-01

Journal:FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

Included Journals:SCIE、EI、Scopus

Volume:35

Issue:8,SI

Page Number:742-766

ISSN No.:8756-758X

Key Words:boundary element method; dynamic stress intensity factors; functionally graded materials; Laplace transform; radial integration method; thermal shock

Abstract:In this paper, transient thermoelastic crack analysis in two-dimensional, isotropic, continuously non-homogeneous and linear elastic functionally graded materials subjected to a thermal shock is presented. The Laplace transform technique is used to eliminate the time dependence of the governing equations of the linear coupled thermoelasticity. Fundamental solutions for isotropic, homogeneous and linear elastic solids in the Laplace-transformed domain are applied to derive boundarydomain integral equations for the mechanical and thermal fields. The radial integration method is employed to transform the domain integrals into the boundary integrals. A collocation-based boundary element method is implemented for the spatial discretization of the boundarydomain integral equations. The time-dependent numerical solutions are obtained by using Stehfest's inversion algorithm. Numerical results are presented and discussed to show the influences of the material gradation, the thermo-mechanical coupling, the crack orientation and the thermal shock loading on the dynamic stress intensity factors.