Evaluation of Detecting Method With AC and DC Excitations of Opposite-Side Defect in Steel Using 3-D Nonlinear FEM Taking the Minor Loop Into Account
Evaluation of Detecting Method With AC and DC Excitations of Opposite-Side Defect in Steel Using 3-D Nonlinear FEM Taking the Minor Loop Into Account
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DOI：
10.1109/tmag.2007.916486
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发表时间：
2008-05
影响因子：
2.1
通讯作者：
Y. Gotoh;N. Takahashi
中科院分区：
文献类型：
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作者：
Y. Gotoh;N. Takahashi
由于电磁无损检测方法可以实现高速检测，本文对石油化工装置等储罐对侧缺陷的电磁检测方法进行了研究。本文提出了利用直流磁场和微小交流磁场的电磁检测方法。采用考虑磁滞（小回线）和涡流的三维有限元方法研究了钢中熔剂的行为。结果表明，利用磁导率差的小回路可以检测到对侧缺陷，而小回路在磁滞回路上的位置受缺陷的存在影响。
Since high-speed examination is possible using an electromagnetic nondestructive inspection method, the inspection of an opposite side defect of the tank in the petrochemical plant, etc. by the electromagnetic method is investigated. In this paper, the electromagnetic inspection method using a dc magnetic field and a minute ac magnetic field is proposed. The behavior of flux in steel is examined using a 3-D finite-element method taking into account hysteresis (minor loop) and eddy current. It is shown that the detection of the opposite-side defect is possible with the differential permeability of a minor loop of which the position on the hysteresis loop is affected by the existence of defect.