ELASTIC-WAVE SCATTERING AND STONELEY WAVE LOCALIZATION BY ANISOTROPICIMPERFECT INTERFACES BETWEEN SOLIDS

In this paper, elastic scattering and localization of guided waves on a thin anisotropic imperfect interfacial layer between two solids are studied. We have proposed a second-order asymptotic boundary condition approach to model such an interfacial layer. Here, using previous res ults, we derive simple stiffness-matrix representations of stress-disp lacement relations on the interface for the decomposed symmetric and a nti-symmetric elastic motions. The stiffness matrices are given for an off-axis orthotropic layer or, equivalently, for a monoclinic interfa cial layer. For the problem of scattering on such a thin anisotropic l ayer between identical isotropic semi-spaces the scattering matrices a re obtained in explicit forms. Analytical dispersion equations for Sto neley-type interfacial waves localized in such a system are also given . Additional results are included for imperfect interfaces, such as fr actured interfaces, modelled by spring boundary conditions. The applic ability of the stiffness-matrix approach to the layer model is analyse d by numerical comparison between the approximate and exact solutions. The numerical examples, which include reflection transmission on the interphase and dispersion curves of the interfacial waves, show that t he stiffness-matrix method is a simple and accurate approach to descri be wave interaction with a thin anisotropic interfacial layer between two solids.