Crack Initiation Model in Elastic Piecewise Homogeneous Body with Broken Interface

The model of a crack initiation in a piecewise homogeneous body with a broken interface between elastic isotropic materials joined by plastic adhesive is developed. The initial stage of the crack initiation under plane strain and symmetric load about the bisector of the break angle is considered as the formation of a plastic zone in the joining material and a process zone in one of the materials of the composite joining near the corner point of the interface. The parameters of the process zone are calculated and the conditions of the crack initiation in the zone are defined by the deformation and energy criteria. The results of numerical investigation of the parameters of the process zone are analyzed.