Edwards, R. S. (Rachel S.), Dutton, B. (Ben), Clough, A. R. and Rosli, M. H. (2012) Scanning laser source and scanning laser detection techniques for different surface crack geometries. In: Review of Progress in Quantitative Nondestructive Evaluation, Burlington, VT, 17th-22nd July 2011. Published in: AIP Conference Proceedings, Volume 1430 (Number 31). pp. 251-258.

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Abstract

Standard test samples typically contain simulated defects such as slots machined normal to the surface. However, real defects will not always propagate in this manner; for example, rolling contact fatigue on rails propagates at around 25º to the surface, and corrosion cracking can grow in a branched manner. Therefore, there is a need to understand how ultrasonic surface waves interact with different crack geometries. We present measurements of machined slots inclined at an angle to the surface normal, or with simple branched geometries, using laser ultrasound. Recently, Rayleigh wave enhancements observed when using the scanning laser source technique, where a generation laser is scanned along a sample, have been highlighted for their potential in detecting surface cracks. We show that the enhancement measured with laser detector scanning can give a more significant enhancement when different crack geometries are considered. We discuss the behaviour of an incident Rayleigh wave in the region of an angled defect, and consider mode-conversions which lead to a very large enhancement when the detector is close to the opening of a shallow defect. This process could be used in characterising defects, as well as being an excellent fingerprint of their presence.

Item Type:	Conference Item (Paper)
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Rayleigh waves, Surfaces (Technology) -- Defects, Nondestructive testing
Journal or Publication Title:	AIP Conference Proceedings
Publisher:	American Institute of Physics
ISSN:	0094-243X
Official Date:	2012
Volume:	Volume 1430
Number:	Number 31
Page Range:	pp. 251-258
Identification Number:	10.1063/1.4716237
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
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:	Burlington, VT
Date(s) of Event:	17th-22nd July 2011
References:	1. Armitage P.R., Insight 44 (6) 369 (2002). 2. The National Physical Laboratory, Report on Stress Corrosion Cracking (2000). 3. Edwards R.S., Dixon S., and Jian X., Ultrasonics 44 (1) 93 (2006). 4. Edwards R.S., Dutton B., Clough A.R and Rosli M.H., Applied Physics Letters 99 094104 (2011). 5. Dutton B., Clough A.R., Rosli M.H. and Edwards R.S., NDT&E International 44 (4) 353-360 (2011). 6. Dutton B., Clough A.R. and Edwards R.S., J. Nondestruct. Eval. 30 (2) 64-70 (2011). 7. Kinra V.K. and Vu B.Q., Journal of the Acoustical Society of America 79 (6) 1688 (1986). 8. C.B. Scruby, L.E. Drain. “Laser ultrasonics: techniques and applications.” Adam Hilger, 1990. 9. Kromine A.K., Fomitchov P.A., Krishnaswamy S. and Achenbach J.D., Materials Evaluation 58 (2) 173 (2000). 10. Arias I. and Achenbach J.D., Wave Motion 39 (1) 61 (2004). 11. Klien M., Bacher G., Grunnet-Jepson A., Wright D. and Moerner W., Optics communications 162 79 – 84 (1999). 12. I.A. Viktorov. “Rayleigh and Lamb waves: physical theory and applications.” Plenum Press 1967. 13. Rosli M.H., Fan Y. and Edwards R.S., these proceedings. 14. Blackshire J.L. and Sathish S., Applied Phys. Letters 80 (18) 3442-3444 (2002). 15. Edwards, R.S., Jian X. and Dixon S.., Applied Physics Letters 87 (19) 3 (2005). 16. Rose, J.L., Ultrasonic waves in Solid Media, Cambridge University Press (1999). 17. De Marchi L., Speciale N. and Viola E., NDT&E International 43 (3) 265-271 (2010). 18. Ech-Cherif El-Kettani, Luppea F. and Guilleta A., Ultrasonics 42 (1-9) 807-812 (2004).
URI:	http://wrap.warwick.ac.uk/id/eprint/50874

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