3-D nonlinear eddy current analysis of factors affecting the evaluation of alternating flux leakage testing

Issue title: Proceedings of the tenth International Symposium on Applied Electromagnetics and Mechanics ISEM-Tokyo

Article type: Research Article

Authors: Gotoh, Yuji^a | Takahashi, Norio^b

Affiliations: [a] Department of Electronics Engineering, Chugoku Polytechnic College, 1242-1 Nagao, Tamashima, Kurashiki, 710-0251, Japan. Tel.: +81 86 526 321; Fax: +81 86 526 2319; E-mail: [email protected] | [b] Department of Electrical and Electronic Engineering, Okayama University, 3-1-1 Tsushima, Okayama 700-8530, Japan. Tel.: +81 86 251 8115; Fax: +81 86 251 8258; E-mail: [email protected]

Abstract: The signal of an alternating magnetic flux leakage testing is affected by several factors, such as the buried length from surface, depth of crack. In this paper, the effects of those factors on the flux distribution near a search coil are examined using 3-D nonlinear FEM. It is shown that the leakage flux is produced by the saturation of steel near the surface, if the distance from the surface to a crack is small.

DOI: 10.3233/JAE-2002-350

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 29-34, 2002