The distorted wave Born approximation: Application to elastodynamics

摘要

An approximate theory for scattering of elastic waves by general shaped defects has been developed. A defect of arbitrary shape can be represented by a sphereSand a remainder volumeRmacr;. Using the exact solution for a sphere and treatingRmacr;as a perturbation, the solution corresponding to the distorted wave Born approximation is obtained. This solution contains nontrivial frequency dependence and phase information. Preliminary comparisons with experiments are presented.