Flaw detection in three-dimensional shape portion using uniform eddy current multiprobe

Issue title: Selected Papers from the 15th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2011)

Article type: Research Article

Authors: Fukuoka, Katsuhiro^{a; *} | Hashimoto, Mitsuo^b

Affiliations: [a] The University of Shiga Prefecture, Hikone, Shiga, Japan | [b] Aomori Polytechnic College, Goshogawara, Aomori, Japan

Correspondence: [*] Corresponding author: Katsuhiro Fukuoka, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan. Tel.: +81 749 28 9554; Fax: +81 749 28 9554; E-mail: fukuoka.k@usp.ac.jp

Abstract: We designed exciting coils of uniform eddy current multiprobes with considering the shape of structures in order to obtain a uniform eddy current flow. A probe for a flat plate could obtain clear signals for an electrical discharge machining (EDM) slit of depth 0.5 mm and distinguish EDM slits arranged at 2 mm intervals. We confirmed that stress corrosion cracking (SCC) is detectable with sufficient sensitivity using the developed multiprobe. The probe for a curved portion obtained clear signals for the EDM slits on a curved surface of radius 25 mm. Moreover, we examined the technique for estimating crack shape from detection signals.

Keywords: Eddy current testing (ECT), uniform eddy current probe, multiprobe, stress corrosion cracking (SCC), curved portion, estimation of crack shape

DOI: 10.3233/JAE-2012-1476

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 311-317, 2012