Edwards, R. S. (Rachel S.), Dutton, B. (Ben), Rosli, M. H. and Clough, A. R. (2011) Non-contact ultrasonic characterisation of angled surface defects. In: Review of Progress in Quantitative Nondestructive Evaluation, San Diego, California, 18–23 July 2010. Published in: AIP Conference Proceedings, Vol.1335 (No.1). pp. 257-264. ISSN 0094-243X. doi:10.1063/1.3591864

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Abstract

Surface ultrasonic waves have been shown to have many uses in non-destructive testing, in particular for gauging the depth of surface defects. Much of the previous work has assumed that these defects are oriented normal to the surface. However, this is not always the case; for example, rolling contact fatigue in rails propagates at an angle of around 25° to the surface, and this angle may affect the characterisation. We present results using non-contact ultrasonic methods to generate and detect ultrasound on samples with a range of defect angles, and compare these with finite element method (FEM) models. We use both electromagnetic acoustic transducers (EMATs) and laser ultrasound. The depth calibration when measuring ultrasound transmission is considered, and what affect the angle of a defect has. Several other methods of characterising crack depth and angle are also discussed, including the arrival times of reflected and mode-converted waves, the delay in the transmission of the high-frequency Rayleigh wave, and the enhancement of the signal at the defect in both the in-plane and out-of-plane components.

Item Type:	Conference Item (Paper)
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Ultrasonic testing, Finite element method, Laser beams, Nondestructive testing, Surfaces (Technology) -- Defects, Rayleigh waves
Journal or Publication Title:	AIP Conference Proceedings
Publisher:	American Institute of Physics
ISSN:	0094-243X
Official Date:	23 June 2011
Dates:	Date Event 23 June 2011 Published
Volume:	Vol.1335
Number:	No.1
Page Range:	pp. 257-264
DOI:	10.1063/1.3591864
Status:	Peer Reviewed
Publication Status:	Published
Funder:	European Research Council (ERC)
Grant number:	202735 (ERC)
Conference Paper Type:	Paper
Title of Event:	Review of Progress in Quantitative Nondestructive Evaluation
Type of Event:	Conference
Location of Event:	San Diego, California
Date(s) of Event:	18–23 July 2010

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