#### Location

La Jolla, CA

#### Start Date

1981 12:00 AM

#### Description

Scattering of elastic waves by complex defects is investigated. In previous work the Distorted Wave Born Approximation was developed, in which a general shaped defect is represented as a sphere S and a remainder volume R, the latter being treated in first order perturbation theory. The DWBA was used to study scattering by a sequence of defects representing increasingly larger deviations from spherical; comparisons with experiment and other theories were made. This approach breaks down when scattering by R is of similar magnitude as by S. Such is the case for complex defects such as two spheres, or a sphere and a crack emanating from it. To treat such situations, a multiple scattering formalism was developed.

#### Book Title

Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE

#### Chapter

10. Ultrasonic Scattering from Irregular Flaws

#### Pages

305-310

#### Language

en

#### File Format

application/pdf

#### Included in

Acoustics, Dynamics, and Controls Commons, Engineering Mechanics Commons, Mechanics of Materials Commons

Scattering of Elastic Waves by Complex Defects; Multiple Scattering Formalism

La Jolla, CA

Scattering of elastic waves by complex defects is investigated. In previous work the Distorted Wave Born Approximation was developed, in which a general shaped defect is represented as a sphere S and a remainder volume R, the latter being treated in first order perturbation theory. The DWBA was used to study scattering by a sequence of defects representing increasingly larger deviations from spherical; comparisons with experiment and other theories were made. This approach breaks down when scattering by R is of similar magnitude as by S. Such is the case for complex defects such as two spheres, or a sphere and a crack emanating from it. To treat such situations, a multiple scattering formalism was developed.