Dynamic response of interface cracks originating at an hole in a half-space to SH-wave

The dynamic stress responses of interface cracks originating at an hole in a half-space to SH-wave were studied using the methods of 'image' and 'partitioning-conjunction'. Firstly, the half space was imaged into a full space and a scattering wave field satisfying boundary conditions was constructed with the method of 'image'. Secondly, with the help of the 'partitioning-conjunction' method and 'crack-division' technique, the solving domain was divided into two parts along the interface, the two sub-domains satisfying the continuous 'conjunction' conditions of displacement and stress on the interface were conjoined, and a group of integral equations were built to solve this problem. Finally, the dynamic stress intensity factor of the interface crack tip was analyzed with the numerical method. Numerical results demonstrated that the purpose of reducing crack tip's dynamic stress can be achieved by properly avoiding the combination of the most adverse effect factors, such as, incident wave number, incident angle, and crack length, etc. ©, 2014, Chinese Vibration Engineering Society. All right reserved.