Crack defect detection of aluminum plate based on electromagnetic ultrasonic guided wave

被引：0
|
作者：
Yang L. [1 ]
Xing Y. [1 ]
Zhang J. [1 ]
Gao S. [1 ]
机构：
[1] School of Information Science and Engineering, Shenyang University of Technology, Shenyang
来源：
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2018年 / 39卷 / 04期
关键词：
Bio-Sawal law; Diagonal winding coil; Electromagnetic ultrasonic transducer; Main acoustic beam; Oblique defect;
D O I：
10.19650/j.cnki.cjsi.J1702976
中图分类号：
学科分类号：
摘要：
A structure design of electromagnetic ultrasonic guided wave transducer with asymmetrical oblique tortuous coil is proposed to detect crack defect of oblique crack in aluminum sheet. Equivalent force and magnetic model of zigzag coil and asymmetric oblique zigzag coil is established by using the Biot-Savart law. The relationship of the Lorenz force, magnetic induction intensity and propagation characteristics of the main acoustic beam are analyzed in EMAT mechanism. Defect detection performance of zigzag coil electromagnetic ultrasonic transducer with different oblique angle is verified by experiments. Results show that main beam echo signal of electromagnetic ultrasonic transducer with oblique zigzag coil distributes asymmetrically, whose direction is perpendicular to the working wire of transducer coil. Control of propagation direction of electromagnetic ultrasonic guided wave in aluminum plate can be realized through different oblique angles The proposed design can provide theoretical and application foundations for omnidirectional crack defect detection in aluminum plate. © 2018, Science Press. All right reserved.
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页码：150 / 160
页数：10
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