Dynamic Anti-plane Characteristic Of Piezoelectric Media With An Non-circular Cavity

Piezoelectric materials possess high degree of high power density, greater efficiency and potential for low cost manufacture in comparison with alternative electromechanically coupled materials. As a result, the applications of piezoelectric materials have given rise to the remarkable progress of sensors and actuators used in the self-controlling and self-monitoring smart structures. In many practical devices, the structures with holes or cavities consist of the piezoelectric and other materials are most widely adopted. So much attention has focused on the dynamic response of the piezoelectric structures with holes or-cavities.Scattering and dynamic stress concentrations of time harmonic SH-wave in homocentric non-circular piezoelectric cavity are studied with the help of complex variable and wave function expansion method. The relations that the stress fields' depend on intensity of incident wave and electric fields are revealed. The expressions of dynamic stresses and electric fields at edge of the cavities are obtained. As examples of calculation. Numerical calculations of the piezoelectric medium with an elliptic cavity are made with different wave numbers and different piezoelectric characteristic parameters. The calculating results show that dynamic stress and dynamic electric field concentrations at edge of the cavity have linear dependence on electric field. Dynamic analyses are very important to piezoelectric media with a hole at lower frequencies and large piezoelectric characteristic parameters.