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Acoustic MicroscopySecond Edition$
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Andrew Briggs and Oleg Kolosov

Print publication date: 2009

Print ISBN-13: 9780199232734

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780199232734.001.0001

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Surface cracks and boundaries

Surface cracks and boundaries

Chapter:
(p.255) 12 Surface cracks and boundaries
Source:
Acoustic Microscopy
Author(s):

G. A. D. Briggs

O. V. Kolosov

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199232734.003.0012

Surface cracks and boundaries give contrast in acoustic microscopy even when they are so fine that by conventional resolution criteria they would be expected to be scarcely visible. The contrast arises from the scattering of Rayleigh waves, and the evidence for this is the tell‐tale presence of fringes parallel to cracks, with spacing equal to half a Rayleigh wavelength. Contrast theory based on separating the specular and Rayleigh components of the signal give a good account of the fringes which are observed. Time‐resolved measurements can be made of crack‐tip diffracted signals. The remarkable contrast from cracks is useful in the study of indentation and fracture of low‐ductility materials.

Keywords:   surface crack, boundary, scattering, fringe, Rayleigh wavelength, indentation, fracture

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