Damping in Metal-Matrix Composites: Measurement and Modeling,
NATIONAL BUREAU OF STANDARDS BOULDER CO FRACTURE AND DEFORMATION DIV
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Both experimentally and theoretically, this report considers attenuation, alpha, of elastic waves in a composite consisting of elastic reinforcing particles dispersed in an elastic matrix. The authors consider only geometrical attenuation caused by scattering from particles. Their model contains the effects of particle volume fraction, particle shape, particle size, particle elastic constants, matrix elastic constants, measurement frequency, and elastic-wave polarization. Concerning the particles, they make several assumptions arbitrary-shape ellipsoids spheres, discs, rods, uniform distribution, random orientation. Thus, the model composite is macroscopically both homogeneous and isotropic.