Dynamic SIF of interface crack between two dissimilar viscoelastic bodies under impact loading

In this paper, the transient dynamic stress intensity factor (SIF) is deter mined for an interface crack between two dissimilar half-infinite isotropic viscoelastic bodies under impact loading. An anti-plane step loading is as sumed to act suddenly on the surface of interface crack of finite length. T he stress field incurred near the crack tip is analyzed. The integral trans formation method and singular integral equation approach are used to get th e solution. By virtue of the integral transformation method, the viscoelast ic mixed boundary problem is reduced to a set of dual integral equations of crack open displacement function in the transformation domain. The dual in tegral equations can be further transformed into the first kind of Cauchy-t ype singular integral equation (SIE) by introduction of crack dislocation d ensity function. A piecewise continuous function approach is adopted to get the numerical solution of SIE. Finally, numerical inverse integral transfo rmation is performed and the dynamic SIF in transformation domain is recove red to that in time domain. The dynamic SIF during a small time-interval is evaluated, and the effects of the viscoelastic material parameters on dyna mic SIF are analyzed.