Hernandez-Valle, Francisco, Dutton, B. (Ben) and Edwards, R. S. (Rachel S.) (2014) Laser ultrasonic characterisation of branched surface-breaking defects. NDT & E International, Volume 68 . pp. 113-119. doi:10.1016/j.ndteint.2014.08.009 ISSN 0963-8695.

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Abstract

Surface-breaking defects often have a geometry which is more complicated than the ‘normal slot’ used in many calibration tests, and this geometry will affect the reflection and transmission of ultrasonic surface waves incident on the defect. We present here measurements on defects with varied branched geometries, designed to simulate stress corrosion cracking (SCC) type defects, characterising the geometry using laser-based ultrasonic generation and detection of Rayleigh waves. We show the behaviour of the near-field enhancement and the far-field reflection as a function of branch position and length, and signal analysis which can be used to gain further information for characterising the defect geometry. The experimental results and finite element method (FEM) models presented in this paper highlight the potential of this technique to test components prone to developing SCC, in order to identify and characterise surface-breaking defects.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	NDT & E International
Publisher:	Elsevier Sci Ltd.
ISSN:	0963-8695
Official Date:	December 2014
Dates:	Date Event December 2014 Published 6 September 2014 Available 26 August 2014 Accepted 17 March 2014 Submitted
Volume:	Volume 68
Page Range:	pp. 113-119
DOI:	10.1016/j.ndteint.2014.08.009
Status:	Peer Reviewed
Publication Status:	Published

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