TY - JOUR
T1 - Evaluation of detectability of differential type probe using directional eddy current for fibre waviness in CFRP
T2 - Advanced Eddy Current Testing for CFRP
AU - Kosukegawa, Hiroyuki
AU - Kiso, Yuta
AU - Hashimoto, Mitsuo
AU - Uchimoto, Tetsuya
AU - Takagi, Toshiyuki
N1 - Funding Information:
Ethics. This manuscript has not been published and is not under consideration for publication elsewhere. Data accessibility. This article has no additional data. Authors’ contributions. M.H. designed symmetrical probe and uniform driving probe. Y.K. carried out the experiments and numerical simulation. H.K. and T.U. performed the data analysis. H.K. and T.T. conceived of and designed the study, and drafted the manuscript. All authors read and approved the manuscript. Competing interests. The authors declare that they have no competing interests. Funding. This work is funded by The JSPS Grant-in-Aid for Exploratory Research ‘15K14143’. Acknowledgements. The authors thank Mr. Junya Horibe of Tohoku University for his help in numerical simulation.
Publisher Copyright:
© 2020 The Author(s).
PY - 2020/10/16
Y1 - 2020/10/16
N2 - 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° in unidirectional CFRP. The probe shows a root mean square error of 1.90° and a standard deviation of 4.49° 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'.
AB - 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° in unidirectional CFRP. The probe shows a root mean square error of 1.90° and a standard deviation of 4.49° 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'.
KW - carbon fibre reinforced plastics
KW - directional eddy current
KW - eddy current testing
KW - fibre waviness Hough transform
KW - non-destructive testing
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U2 - 10.1098/rsta.2019.0587
DO - 10.1098/rsta.2019.0587
M3 - Article
C2 - 32921244
AN - SCOPUS:85090873343
VL - 378
JO - Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
JF - Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
SN - 0962-8428
IS - 2182
M1 - 20190587
ER -