Abstract
Three-dimensional finite element analysis has been carried out on the 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 : the virtual crack extension method, the modified crack-closure integral and displacement extrapolation. The effect of Young's modulus ratio on stress intensity factors is discussed under various kinds of mixed-mode loading. The distribution of stress intensity factors along the crack front is investigated. A comparison between stress-intensity factor KI and KII, obtained by these three methods, is carried out.
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