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Non-contact ultrasonic characterisation of angled surface defects

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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.

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Official URL: http://dx.doi.org/10.1063/1.3591864

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

Identification Number:

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

References:

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5. C.B. Scruby, L.E. Drain. “Laser ultrasonics: techniques and applications.” Adam Hilger, 1990
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