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 to approaches zero is found, while the energy release rate is shown to be continuous at ω = 0. The limit case of the kinked length b approaching zero is also investigated. The result shows that the stress field has $1/r$ singularity and the energy release rate at b = 0⁺ is enhanced at some ω if the crack kinks into the more compliant material.