Experiment of crack detection of metal plate based on electromagnetically induced acoustic emission

Nondestructive detection can be realized with the effect that the dynamic electromagnetic loading on the sheet metal can generate a stress field stimulating stress waves from the defects.The principle and implementation procedure of the electromagnetically induced acoustic emission(EMAE) is thoroughly analyzed in this paper.The high-current pulse generator which is used in the EMAE experiment is designed.The simple time-frequency analy-sis to the experimental signal is achieved by using fast Fourier transform(FFT).It researches the change patterns of EMAE signal with the different specimens and electromagnetic loading conditions.It verifies that it could excite the phenomenon of EMAE in the metal plate with the crack.The experimental results lay a good foundation for the engineering application of EMAE.