ELASTIC WAVE SCATTERING BY ROUGH FLAWS AND CRACKS

The scattering of elastic waves by three dimensional rough flawa and cracks is analyzed using the T-matrix approach. The scattering cross section is obtained for spheroidal cavities with a periodically corrugated surface which may be used as a model for flaws with a rough surface. The dependence of the scattering cross section on the wavelength of the corrugations is studied as a function of the incident wavelength. Cracks are modelled as degenerate oblate spheroids and the scattering cross section is ob-tained for incident P-waves, Multiple scattering analysis of two cavities is also discussed with some numerical results. SCATTERING FR0t·1 ROUGH SPHEROIDAL CAVITIES The Scattering from rough oblate spheroidal cavities is very important since they may be used to serve as models for flaws found in structural "applications. Theoretical data obtained in such analysis are very helpful in experimental verifi-cation as well as in the inverse problem of scat