Dynamic mode-Ill interface crack in a bi-material strip

摘要

An interfacial crack is placed within a two-phase elastic strip subjected to an out-of-plane loading. In the unperturbed state, the crack propagates with a constant speed V along the interface. The Di-richlet boundary conditions are applied to the upper and lower sides of the strip. The exterior boundary is subjected to a regular small perturbation; in addition, it is assumed that the crack speed changes by a small amount ??'(t), where ? is a smooth function of time t. The asymptotic model presented in this paper delivers an approximation for the stress-intensity factor and an integro-differential equation for the perturbation function ?. A particular feature of the model is in the use of skew-symmetric dynamic weight functions, attributed to the interfacial crack problem in a strip.