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

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Jan 1st, 12:00 AM

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.