DYNAMIC STRESS INTENSITY FACTOR FOR RADIAL CTACKS AT THE EDGE OF A CIECULAR CAVITY IN A PIEZOELECTRIC MEDIUM

Based on the method of Green’s function, the problem of SH-wave scattering by a circular cavity with any finite lengths radial cracks and the dynamic stress intensity factor at the crack tip in a piezoelectric material are investigated in the paper. Firstly, the displacement Green’s function and the electric potential Green’s function suitable for the present problem are constructed. Secondly, the infinite piezoelectric material is divided into two semi media. Based on the crack-division technique, the above two semi media can be conjuncted to a whole infinite medium. Thirdly, integral equations for the unknown stresses solution can be established, which are related to crack-tip dynamic stress intensity factor. The analytical expression on dynamic stress intensity factor is also obtained. Finally, some cases for the crack-tip dynamic stress intensity factor are given, and some of the results are compared with the same situation about elastic medium.