Abstract：Based on the fluidstructure interaction theory, finite element method was used to numerically simulate the Leaky Lamb waves derived from piezoelectric wafer active sensor of anisotropic plate in ideal fluid. The dispersion and attenuation characteristics of Leaky Lamb waves in unidirectional fiber reinforced composites were analyzed to obtain the numerical solution of full wave field. The effects of different orientation of fiber with different excitative frequencies on the waveform were discussed. The results show that two modes of Leaky Lamb waves exist simultaneously in anisotropic plate immersed in ideal fluid. One is a Non-dispersive and barely attenuation mode of S0， the other is a dispersive and attenuation mode of A0. Velocity,dispersion and attenuation characteristics of waveform are significantly affected by fiber orientation. The quantitative relation between the excitation, the material parameters and the corresponding waveform was established by numerical simulation to provide a theoretical basis for NET and NDE applications of Leaky Lamb waves.
2012, Vol. 33 
