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Ultrasonic Scattering by Planar and Non-Planar Cracks,
COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING
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Scattering of elastic waves by surface-breaking planar and non planar branched cracks, of considerable current interest for ultrasonic nondestructive evaluation, has been studied in this paper. Attention has been focused on the near field surface displacements and the crack tips stress intensity factors. For planar normal cracks the stress intensity factors are shown to agree with earlier results. Numerical results showing normalized vertical surface displacements are presented for incident body and surface waves. It is shown that the results for planar and branched cracks can be significantly different in some instances.
APPROVED FOR PUBLIC RELEASE