电磁超声换能器金属缺陷探测有限元仿真研究

分析了电磁超声换能器（eectromagnetic acoustic transducer ，EMAT）超声波发生、接受过程及导体缺陷检测的原理，然后基于电磁学理论和有限元技术，建立了一个可用于导电体内部缺陷探测的二维EMAT有限元模型。通过细分单元网格技术和理论与仿真结果对照验证了模型的准确性。最后仿真结果表明：仿真模型可以检测出铝和钢铁两种材质板中不同位置的内部缺陷，且对铝材质内部的缺陷探测更加有效。

FE simulation study on detecting steel defects using EMAT

The processes of generation ,reception of ultra acoustic wave of EMAT and principle of detecting defect in conductive material were presented in this paper .Then a FEA model of 2D EMAT was set up to detect the internal defects in conductive material based on the electromagnetics theory and finite element method .The accuracy of FEA model was verified by refining mesh elements and result comparison between theoretical calculation and simulation .In the last ,simulation result comparisons indicate that the 2D EMAT model can be applied to detect internal defects in aluminum and steel plates ,and compared to the steel plate ,detecting effect for aluminum plates is more efficient .