Journal
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 378, Issue 2182, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsta.2019.0587
Keywords
carbon fibre reinforced plastics; non-destructive testing; eddy current testing; directional eddy current; fibre waviness Hough transform
Categories
Funding
- JSPS [15K14143]
- Grants-in-Aid for Scientific Research [15K14143] Funding Source: KAKEN
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This paper describes the detectability of eddy current testing (ECT) using directional eddy current for detection of in-plane fibre waviness in unidirectional carbon fibre reinforced plastic (CFRP) laminate. Three different types of probes, such as circular driving, symmetrical driving and uniform driving probe, were proposed, and the waviness angle was extracted from the contour map of the ECT signal by applying a Canny filter and a Hough transform. By comparing both the waviness angle estimated by ECT and that obtained by an X-ray CT image, the standard deviation (precision) and root mean square error (accuracy) were evaluated to discuss the detectability of these probes. The directional uniform driving probe shows the best detectability and can detect fibre waviness with a waviness angle of more than 2 degrees in unidirectional CFRP. The probe shows a root mean square error of 1.90 degrees and a standard deviation of 4.49 degrees between the actual waviness angle and the angle estimated by ECT. This article is part of the theme issue 'Advanced electromagnetic non-destructive evaluation and smart monitoring'.
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