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Characterisation of small defects using miniaturised EMAT system

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Trushkevych, O. and Edwards, R. S. (2019) Characterisation of small defects using miniaturised EMAT system. NDT & E International, 107 . 102140. doi:10.1016/j.ndteint.2019.102140 ISSN 0963-8695.

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Official URL: https://doi.org/10.1016/j.ndteint.2019.102140

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Abstract

Many surface breaking defects, such as those caused by thermal fatigue or stress corrosion, have finite lateral dimensions. However, much of the research considers significantly larger simulated defects. This paper considers defects with mm-dimensions, and presents a method for characterisation of their length and depth. This is done using non-contact ultrasonic techniques, including a pair of electromagnetic acoustic transducers (EMATs) with significantly reduced size compared to standard industrial EMATs. Defects with dimensions of 1–11 mm length and 0.5–2 mm depth are measured. All information is obtained from a single raster scan of a sample, considering transmission and enhancement of Rayleigh waves, and introducing the defect cross-section. The lateral size resolution for the scan steps chosen is

±

1 mm, and depth resolution is

±

0.5 mm. The method, being non-contact, is also demonstrated on a sample with a 110 μm thick coating.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QE Geology
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Ultrasonics , Electroacoustic transducers , Rayleigh waves, Metals -- Defects
Journal or Publication Title: NDT & E International
Publisher: Elsevier
ISSN: 0963-8695
Official Date: October 2019
Dates:
DateEvent
October 2019Published
5 July 2019Available
2 July 2019Accepted
Volume: 107
Article Number: 102140
DOI: 10.1016/j.ndteint.2019.102140
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 24 September 2019
Date of first compliant Open Access: 5 July 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
693243, NCUScanEuropean Research Councilhttp://dx.doi.org/10.13039/501100000781

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