熱応力下の異方性異種材界面き裂の応力拡大係数解析

抄録

One of the most frequently encountered problems in bimaterial media is interfacial cracking, sometimes also known as delamination. The stress intensity factors of a crack between dissimilar materials are important parameters for evaluating delamination strength. A new method is proposed for the stress intensity factor analysis- of a crack between dissimilar anisotropic materials under thermal stress. The virtual crack extension method (VCEM), which is used with the finite element method (FEM), is reliable methods for estimating the energy release rate. Energy release rate obtained by the VCEM is separated into individual stress intensity factors, K_I, K_II and K_III using the principle of superposition. The present method was applied to interface cracks between jointed dissimilar plates under thermal stress. The distribution of stress and the crack opening displacement obtained by the asymptotic solution with the stress intensity factors are compared with those of obtained by the FEM with a fine mesh. They are almost identical each other.