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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
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Official URL: https://doi.org/10.1016/j.ndteint.2019.102140
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 | ||||||||
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| 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 |
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| Divisions: | Faculty of 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: |
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| Date of first compliant deposit: | 24 September 2019 | ||||||||
| 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 | ||||||||
| RIOXX Funder/Project Grant: |
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