Abstract
The scattering of ultrasonic Rayleigh waves incident normally on corners containing cracks is considered using elastodynamic ray theory. Detailed calculations for right-angle cracks in right-angle corners show that crack depth can be measured simply from the spacing of interference fringes in the spectra of the back- or forward-scattered Rayleigh waves. The technique is applicable without modification to the more general case of a crack at almost any angle in a corner of almost any angle. The method is demonstrated for a 3mm deep slot cut at 120° in a 240° corner of an aluminium specimen, using the back-scattered wave because it is more strongly modulated than the forward-scattered wave. The possible failure of the technique at certain known specific corner angles is discussed, and demonstrated for one case for aluminium.
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