Scattering of SH waves from a partially debonded rigid elliptic cylinder

Scattering of SH waves by an embedded rigid elliptic cylinder of finite len gth, which is partially debonded from elastic soil is studied. The debondin g regions are modeled as multiple elliptic are-shaped interface cracks with non-contacting faces. The scattered wave field is expressed as a Mathieu f unction expansion with unknown coefficients, The mixed boundary conditions of the problem lead to a set of singular integral equations of the first ty pe in terms of the dislocation density functions of the cracks. A quadratur e method is used to solve these integral equations numerically. The results for dynamic stress intensity factors, far-field pattern of the displacemen t and scattering cross sections are presented. We particularly discuss the effects of the ratio of the short radius to long radius of the cylinder. (C ) 2001 Elsevier Science Ltd. All rights reserved.