Acoustic emission effect induced by Lorentz and Magnetostriction force

This paper investigates Electromagnetically Induced Acoustic Emission (EMAE) that can be used to detect the microcrack. In EMAE, Acoustic Emission (AE) is induced by Lorentz and Magnetostriction Force. The EMAE experiments under different exciting currents are carried out. In this paper, we use an Electromagnetic Acoustic Transducer (EMAT) to stimulate AE signals. According to Kaiser Effect and AE theory, AE signal from a microcrack is processed using Wavelet Packet Method (WPM). Then, the law of AE signal can be got, which can be used to detect a microcrack and do a damage assessment. This study provides crucial references for optimization analysis of EMAE. Meanwhile, the application of eddy current greatly reduces the demands of the power supply and improves the detection speed compared using the direct loading, which makes the engineering application of EMAE in possible.