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Enhancement of ultrasonic surface waves at wedge tips and angled defects

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Edwards, R. S. (Rachel S.), Dutton, B. (Ben), Clough, A. R. and Rosli, M. H.. (2011) Enhancement of ultrasonic surface waves at wedge tips and angled defects. Applied Physics Letters, Vol.99 (No.9). 094104. ISSN 0003-6951

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Official URL: http://dx.doi.org/10.1063/1.3629772

Abstract

The behaviour of sound waves interacting with wedges has attracted interest from researchers in geophysics and non-destructive testing. We consider here the near-field behaviour of Rayleigh waves incident on wedges and surface-breaking defects which propagate at an angle to the surface, such as rolling contact fatigue on rails. It has been shown that, for a detection point on the edge of the crack tip, a very large signal enhancement is observed for shallow angles. We explain this behaviour through considering the effect of the defect geometry, with changes in the frequency thickness product leading to mode-conversion of the incident Rayleigh wave.

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Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Rayleigh waves
Journal or Publication Title:	Applied Physics Letters
Publisher:	American Institute of Physics
ISSN:	0003-6951
Date:	August 2011
Volume:	Vol.99
Number:	No.9
Page Range:	094104
Identification Number:	10.1063/1.3629772
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Research Council (ERC)
Grant number:	202735 (ERC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/38446