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Vol. 34, No. 8(3), S&M3042

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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials
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Sensors and Materials, Volume 33, Number 7(3) (2021)
Copyright(C) MYU K.K.
pp. 2511-2520
S&M2634 Research Paper
https://doi.org/10.18494/SAM.2021.3380
Published: July 27, 2021

Proposed Inspection Method for Opposite-side Defect in Steel Plate Using Synthetic Magnetic Field with High and Low Excitation Frequencies [PDF]

Saijiro Yoshioka, Akira Fujii, Makoto Tohara, and Yuji Gotoh

(Received April 21, 2021; Accepted June 24, 2021)

Keywords: 3D nonlinear FEM, nondestructive inspection, opposite-side defect in steel plate, ac synthetic magnetic field, minor loop magnetism property

A defect on the opposite-side of a steel plate is detected by an electromagnetic inspection method using a large static magnetic field and a small alternating magnetic field. However, in this inspection method, it is difficult for the inspection sensor to move because strong magnetic attraction is generated between the steel plate and the inspection sensor. To improve the practicality of this inspection method, it is necessary to weaken the magnetic attraction and improve the detection sensitivity. In this paper, an inspection method for opposite-side defects in a steel plate that uses an alternating magnetic field with high and low excitation frequencies is proposed. It is shown that the detection sensitivity of an opposite-side defect in a steel plate using the alternating magnetic field with the two excitation frequencies is higher than that using a large static magnetic field and a minute alternating magnetic field. The phenomenon underlying this technique is elucidated by analysis using 3D nonlinear finite-element method taking account of the hysteresis (minor loop) and eddy current.

Corresponding author: Yuji Gotoh


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This work is licensed under a Creative Commons Attribution 4.0 International License.

Cite this article
Saijiro Yoshioka, Akira Fujii, Makoto Tohara, and Yuji Gotoh, Proposed Inspection Method for Opposite-side Defect in Steel Plate Using Synthetic Magnetic Field with High and Low Excitation Frequencies, Sens. Mater., Vol. 33, No. 7, 2021, p. 2511-2520.



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