表面疲労き裂評価のための超音波周波数分析

概要

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Cracks act as the sources of acoustic scattering when they are illuminated by incident ultrasonics. They radiate scattering signals, which carry information on the cracks such as location, orientation, shape, and size. In this paper, the spectrum of the reflected Rayleigh wave from the small fatigue crack is interpreted to provide estimates of crack depth and aspect ratio. The crack is initiated at a Vickers indentation and develops by cyclic cantilevered bending. The approach is based on a theoretical calculation of reflection coefficient by sectioning the half-elliptic crack face into small strips ; the reflection coefficient for each strip has been given by the two-dimensional calculation for an edge crack. This nondestructive technique can measure the crack depth larger than 0.13 mm and the crack closure stress from the spectrum response to static bending stress.
一般社団法人日本機械学会の論文
1991-10-25