ANALYSIS OF A KINKED INTERFACIAL CRACK UNDER OUT-OF-PLANE SHEAR

A kinked interfacial crack under out-of-plane shear is analyzed where a straight interfacial crack is kinked into material 1 out of the interface. Employing the Wiener-Hopf technique, the solution is obtained in a closed form. Discontinuity in the stress intensity factor as the kink angle omega approaches zero is found, while the energy release rate is shown to be continuous at omega = 0. The limit case of the kinked length b approaching zero is also investigated. The result shows that the stress field has 1/square-root r singularity and the energy release rate at b = 0+ is enhanced at some omega if the crack kinks into the more compliant material.