DYNAMIC RESPONSE OF INTERFACE CRACKS IN LAYERED PIEZOELECTRIC HALF SPACE SUBJECTED TO MECHANICAL AND ELECTRICAL IMPACTS

The linear piezoelectricity theory is used to investigate the dynamic response of an array of interface cracks in layered piezoelectric half space subjected to the mechanical and electrical impacts. Two kinds of electric boundary conditions on crack surfaces, i.e. electric insulating and electric contacting, are adopted. Laplace and Fourier transforms and dislocation density functions are employed to reduce the mixed boundary value problem to Cauchy singular integral equations, and further to algebra equations in Laplace transform domain, which are solved numerically. Numerical results show that the electrical load, piezoelectric layer抯 thickness and material property parameters have important and different effects on dynamic energy release rate. The present results are of potential theoretical and applied value to the structure design and prevention of structure failure.