Proposal of evaluation method of opposite side depth on steel plate using magnetic field of square wave on direct current bias

Article type: Research Article

Authors: Yoshioka, Saijiro^a; | Kuboyama, Eiki^a | Gotoh, Yuji^a

Affiliations: [a] Department of Mechanical and Energy Systems Engineering, Oita University, Oita, Japan

Correspondence: [*] Corresponding author: Saijiro Yoshioka, Department of Mechanical and Energy Systems Engineering, Oita University, 870-1192, Oita, Japan. Tel.: +81 97 554 7795; Fax: +81 97 554 7790; E-mail: v15f1003@oita-u.ac.jp

Abstract: As for the alternating magnetic flux leakage testing of non-destructive inspection, the alternating magnetic field with high frequency is used. Therefore, this inspection method is not used for inspection of the opposite side defect in the steel plate. In this paper, the inspection method of the opposite side defect in the steel plate is proposed by this inspection method using the magnetizing current of the square wave on direct-current bias. This inspection principle is investigated by 3-D nonlinear FEM analysis taking account of magnetizing properties of minor loop and eddy current in the steel plate.

Keywords: Alternating magnetic flux leakage testing, AC square wave on DC bias magnetic field, 3-D nonlinear FEM, minor loop

DOI: 10.3233/JAE-171111

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 4, pp. 1393-1400, 2019