A model of ultrasonic nondestructive testing for internal and subsurface cracks
- University of Trollhaettan/Uddevalla, Box 957, 461 29 Trollhaettan (Sweden)
- Division of Mechanics, Chalmers University of Technology, S-412 96 Goeteborg (Sweden)
The scattering of elastic waves in a half-space containing a striplike crack is investigated. As a special case it seems that the crack may be surface breaking. A surface integral equation with the half-space Green tensor is employed. The key point of the method is the expansion of the Green tensor in Fourier representations with the free part of the Green tensor expanded in the crack coordinate system and the half-space part in the half-space coordinate system. The integral equation is discretized by expanding the crack opening displacement in terms of Chebyshew functions having the correct square root behavior along the crack edges. The incident field is emitted from an ultrasonic probe and a recent model for this is employed. The signal response in another (or the same) probe is modeled by a reciprocity argument and the stationary phase approximation is employed to simplify the final answer, which is thus only valid in the far field of the probes (yielding essentially a spherical wave). Numerical results are given and are compared with both other methods and with available experiments. {copyright} {ital 1997 Acoustical Society of America.}
- OSTI ID:
- 553984
- Journal Information:
- Journal of the Acoustical Society of America, Journal Name: Journal of the Acoustical Society of America Journal Issue: 5 Vol. 102; ISSN 0001-4966; ISSN JASMAN
- Country of Publication:
- United States
- Language:
- English
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