Rosli, M. H., Edwards, R. S. (Rachel S.) and Fan, Y.. (2012) In-plane and out-of-plane measurements of Rayleigh waves using EMATs for characterising surface cracks. NDT & E International, Vol.49 . pp. 1-9. ISSN 09638695

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Abstract

Electromagnetic acoustic transducers (EMATs) have been used to measure the properties of Rayleigh waves in the vicinity of defects propagating at different angles to the sample surface, which are more representative of real defects than slots machined normal to the surface. Transmission measurements show that one must consider the angle of the defect when choosing a depth calibration curve. We propose a procedure for crack characterisation (depth, angle) that considers transmission alongside measurements of both the in-plane and out-of-plane velocity components of the Rayleigh wave in the near-field of a defect, where the signal is enhanced due to constructive interference of incident and reflected wavemodes, and/or mode conversion. This procedure uses image analysis of B-scans alongside the ratio of the enhancement in the in-plane to the out-of-plane components to characterise the angle. Once this is known the correct transmission depth calibration curve can be used. The procedure shows very good agreement between the measured and the actual slot characteristics on test samples.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Rayleigh waves, Surfaces -- Defects -- Reporting
Journal or Publication Title:	NDT & E International
Publisher:	Elsevier Science BV
ISSN:	09638695
Date:	2012
Volume:	Vol.49
Page Range:	pp. 1-9
Identification Number:	10.1016/j.ndteint.2012.03.002
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/45760

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