Lamb waves in a functionally gradient material plate and its transient responses. Part 2. Calculation results.

The numerical mathods present in the previous paper for the wave propagation analysis of anisotropic functionally gradient material (FGM) plates are applicated to a SiC-C plate, which is a kind of functionally gradient material plate. The frequency spectum, energy velocities, and the mode shapes of the Lamb waves in the SiC-C plate are obtained. The transient responses of the SiC-C plate excited by time-step impact loads time-pulse ones are computed. The results obtained for the SiC-C plate and for an isotropic homogeneous C monolith plate are compared. It is found that the displacements are much more concentrated on the softer surface of the SiC-C plate than on the surfaces of the homogeneous C monolith plate, and that the displacement responses cooresponding to the surface waves of the SiC-C plate are larger than those of the C monolith plate.