Stress Intensity Factors of Three-Dimensional Interface Crack under Mixed-Mode Loading by Finite Element Analysis

摘要

The 3-D finite element analysis has been carried out on compact normal and shear specimens under mixed-mode loading. The complex stress-intensity factor K associated with an elastic interface crack is discussed via three different approaches: virtual crack extension method, modified crack-closure integral and displacement extrapolation. A comparison between stres-intensity factors. K_1. and K_(II), obtained by three methods, is carried out. The effect of Young's modulus ratio on stress-intensity factors is discussed for specimens under various kinds of mixed-mode loading. The distribution of stress-intensity factors along the crack front is investigated.