Journal
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume 125, Issue 6, Pages 3623-3631Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.3117441
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Funding
- UK Engineering and Physical Sciences Research Council (EPSRC) [GR/T11449/01]
- UK Research Centre in NDE
- BNFL
- Nexia Solutions
- DSTL
- British Energy
- EPSRC [EP/G052069/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G052069/1, GR/S47311/01, GR/T11449/01] Funding Source: researchfish
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The detection of localized defects such as cracks and corrosion in pipes using guided elastic waves is now an established non-destructive testing procedure. However, the prediction of guided wave excitation and scattering in pipes is a complex three-dimensional (3D) problem with many parameters that can generally only be solved using numerical methods. In many important industrial applications, the diameter of a pipe is much larger than wall thickness. In this case an approximate theory is applicable, when a pipe is considered as an unwrapped isotropic plate. In this paper, a technique for obtaining pipe mode amplitudes in terms of the solution to the forced 3D problem on a plate is presented. The same principle is extended to relate guided wave scattering from defects in plates to scattered circumferential modal amplitudes from defects in pipe. This is of practical benefit as the scattering of guided waves by defects in a plate is a much simpler problem than that in a pipe, and one that, in some cases, can be solved using analytical methods. Results are shown that illustrate the application of the method to reflection from through-thickness circumferential cracks in pipes. (C) 2009 Acoustical Society of America. [DOI: 10.1121/1.3117441]
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