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The Application of Finite Element Simulation on Sheet Plate Modal Acoustic Emission Testing

Based on mode acoustic emission theory, the paper uses dynamic finite element software ANSYS / LS-DYNA to simulate modal acoustic emission test, and obtains the Lamb wave propagation analog signal on sheet plate; By analyzing the analog signal, it determines the signal frequency and the Lamb wave arrival time of signal receiving point, then determines the guide wave group velocity at this frequency, and uses the method of time difference analysis to determine the dispersion curve. Comparing the simulation dispersion curve with the theoretical curve, the study has shown both curves are consistent and it is feasible to simulate modal acoustic emission signals with the finite element.