Abstract
We consider the problem of elastic wave propagation in a composite with multiple-coated fibers. The fibers are assumed to be composed of N concentric layers of homogeneous isotropic or transversely isotropic materials and randomly distributed in the matrix medium. We use a homogenization technique which combines the Generalized Self Consistent model (GSCM) and a statistical averaging procedure to calculate the frequency dependent phase velocity and attenuation of the average waves. In the case of a fiber containing a single interface layer, the influence of the thickness, density, and shear modulus of the interface on the phase velocity and attenuation of the average waves is investigated through a parameter study. The results show that changes in the thickness and density of the interface have no significant effect on the phase velocity of the average waves but the shear modulus has a stronger influence. The feasibility of nondestructively characterizing the interface properties through the inversion of low frequency phase velocity data is discussed.
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