Half-layers with interface cracks under anti-plane impact

The solution to a dynamic screw dislocation situated at the interface of a half-layer composed of an isotropic substrate with orthotropic coating is obtained by means of the image method. The structural energy dissipation is modeled by viscous damping. Moreover, stress field in the intact layer, under a pair of anti-plane self-equilibrating point force is determined. These solutions are used to construct integral equations in the half-layers delaminated by edge and embedded cracks, subjected to dynamic anti-plane excitation. The integral equations are solved numerically for the density of screw dislocation on a crack surface and the results are used to determine stress intensity factor for cracks. The edge effect as well as interaction between two interface cracks is studied.