Scattering of Elastic Waves by Inclined Subsurface Cracks

Resonant Scattering and Crack Sizing

“…These studies have led to scattering amplitude computations for ultrasonic backscatter from circular cracks by the method of optimal truncation (MOOT) (1,2) and by T-matrix techniques (3). A key observation in these results is that a peak in the magnitude of the scattering amplitude is found to occur at approximately ka = 1, where k is the longitudinal wave number and a the crack radius, which is independent of the scattering direction.…”

Application of Multiple Scattering Theory to Sub-Surface Defects

“…We use a recently developed multiple scattering formalism, 6 as well as the results of previous calculations on scattering by two adjacent cavities. 3 In the present study the spherical cavity is viewed as one scatterer, and the stress free plane (reflector) as the second. The solution to the sub-surface cavity is then represented as an expansion in the two scattering processes.…”