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Non-contact ultrasonic detection of angled surface defects

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Dutton, B. (Ben), Clough, A. R., Rosli, M. H. and Edwards, R. S. (Rachel S.). (2011) Non-contact ultrasonic detection of angled surface defects. NDT & E International, Vol.44 (No.4). pp. 353-360. ISSN 0963-8695

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Official URL: http://dx.doi.org/10.1016/j.ndteint.2011.02.001

Abstract

Non-destructive testing is an important technique, and improvements are constantly needed. Surface defects in metals are not necessarily confined to orientations normal to the sample surface; however, much of the previous work investigating the interaction of ultrasonic surface waves with surface-breaking defects has assumed cracks inclined at 90° to the surface. This paper explores the interaction of Rayleigh waves with cracks which have a wide range of angles and depths relative to the surface, using a non-contact laser generation and detection system. Additional insight is acquired using a 3D model generated using finite element method software. A clear variation of the reflection and transmission coefficients with both crack angle and length is found, in both the out-of-plane and in-plane components. The 3D model is further used to understand the contributions of different wavemodes to B-Scans produced when scanning a sample, to enable understanding of the reflection and transmission behaviour, and help identify angled defects. Knowledge of these effects is essential to correctly gauge the severity of surface cracking.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Nondestructive testing, Ultrasonic testing, Rayleigh waves, Metals -- Defects, Surfaces (Technology) -- Defects
Journal or Publication Title:	NDT & E International
Publisher:	Elsevier Sci Ltd.
ISSN:	0963-8695
Date:	July 2011
Volume:	Vol.44
Number:	No.4
Page Range:	pp. 353-360
Identification Number:	10.1016/j.ndteint.2011.02.001
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Research Council (ERC), National Endowment for Science, Technology and the Arts (Great Britain) (NESTA)
Grant number:	202735 (ERC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/40116