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Multiple focused EMAT designs for improved surface breaking defect characterization

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Thring, Claire B., Fan, Yichao and Edwards, R. S. (Rachel Sian) (2017) Multiple focused EMAT designs for improved surface breaking defect characterization. In: 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Atlanta, GA, USA, 17-22 Jul 2016. Published in: AIP Conference Proceedings, 1806 (1). 020019. ISBN 9780735414747. ISSN 0094-243X.

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Official URL: http://dx.doi.org/10.1063/1.4974560

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Abstract

Ultrasonic Rayleigh waves can be employed for the detection of surface breaking defects such as rolling contact fatigue and stress corrosion cracking. Electromagnetic Acoustic Transducers (EMATs) are well suited to this technique as they can directly generate Rayleigh waves within the sample without the requirement for wedges, and they are robust and inexpensive compared to laser ultrasonics. Three different EMAT coil types have been developed, and these are compared to assess their ability to detect and characterize small (down to 0.5 mm depth, 1 mm diameter) surface breaking defects in aluminium. These designs are: a pair of linear meander coils used in a pseudo-pulse-echo mode, a pair of focused meander coils also used in pseudo-pulse-echo mode, and a pair of focused racetrack coils used in pitch-catch mode. The linear meander coils are able to detect most of the defects tested, but have a much lower signal to noise ratio and give limited sizing information. The focused meander coils and the focused racetrack coils can detect all defects tested, but have the advantage that they can also characterize the defect sizes on the sample surface, and have a stronger sensitivity at their focal point. Measurements using all three EMAT designs are presented and compared for high resolution imaging of surface-breaking defects.

Item Type: Conference Item (Paper)
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Aluminum -- Surfaces -- Testing, Electroacoustic transducers
Journal or Publication Title: AIP Conference Proceedings
Publisher: American Institute of Physics
ISBN: 9780735414747
ISSN: 0094-243X
Official Date: February 2017
Dates:
DateEvent
February 2017Published
1 March 2017Accepted
Volume: 1806
Number: 1
Page Range: 020019
Status: Peer Reviewed
Publication Status: Published
Date of first compliant deposit: 27 June 2017
Date of first compliant Open Access: 27 June 2017
Funder: Engineering and Physical Sciences Research Council (EPSRC), University of Warwick
Conference Paper Type: Paper
Title of Event: 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation
Type of Event: Conference
Location of Event: Atlanta, GA, USA
Date(s) of Event: 17-22 Jul 2016
Open Access Version:
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