Electromagnetic Acoustic Transducer Mechanism of Steel Plate and Nonlinear Ultrasonic Testing of Plastic Damage

被引：0
|
作者：
Liu S. [1 ]
Wang S. [1 ]
Zhang C. [1 ]
Jin L. [1 ]
Yang Q. [1 ]
机构：
[1] State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Hongqiao District, Tianjin
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 14期
基金：
中国国家自然科学基金;
关键词：
Electromagnetic acoustic transducer; Electromagnetic properties; Ferromagnetic materials; Magnetostrictive effect; Plastic deformation;
D O I：
10.13334/j.0258-8013.pcsee.191303
中图分类号：
学科分类号：
摘要：
The conversion mechanism of electromagnetic acoustic transducer (EMAT) for ferromagnetic material steel plate is closely related to the applied magnetic field, the magnetization characteristics of the material and the magnetostrictive property. The electromagnetic acoustic generation depends largely on the electromagnetic properties of the material and the bias magnetic field. Firstly, electro-magnetic acoustic transducer finite element model of steel plate was established to analyze the impact of the EMAT loading configuration and the electromagnetic properties of the tested components on the electromagnetic acoustic transducer mechanism. By introducing different magnetic permeability and conductivity to simulate plastic damage specimens, the relationship between energy conversion mechanism and electromagnetic characteristics was analyzed. The plastic deformation detection system based on electromagnetic ultrasonic surface waves was built. Secondly, the standard steel plate specimens was tested by magnetic permeability detection technology, and the corresponding relationship between the different plastic damage specimens and the relative magnetic permeability was obtained. Plastic deformation changes the electromagnetic properties of the steel plate, which in turn affects the change of the detection signal. Finally, the electromagnetic ultrasonic nonlinear detection of plastic deformation was carried out, and the corresponding relationship between the relative nonlinear coefficient and plastic deformation was obtained. The relationship between plastic deformation, electromagnetic parameters and nonlinear detection signals was verified. © 2020 Chin. Soc. for Elec. Eng.
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页码：4666 / 4674
页数：8
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