Abstract
Fatigue cracks have been found to initiate and grow in the radial direction in many annulus shaped components in aging helicopters. Detection of such radial cracks using conventional ultrasonic imaging techniques is rather ineffective. Recently, it has been proposed [1] that guided ultrasonic waves that propagate in the circumferential direction may be used for the detection of radial fatigue cracks in weep holes in airframes. Before such guided waves can be used effectively for detecting radial cracks in annulus components, their generation and propagation must be understood. The physics and mechanics of the wave fields must be carefully examined.
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