The interaction of ultrasound with particulate composites

摘要

The longitudinal and shear wave phase velocities and attenuation are measured as function of frequency for random particulate composites, consisting of near mono-disperse spherical glass particles imbedded in a homogeneous epoxy matrix. Experimental results are compared to two theoretical scattering models: the Waterman and Truell method (WT) and the dynamic generalized self-consistent model (DGSCM). It is observed that both models work well in the case of a low inclusion concentration. At higher concentrations both the WT and DGSCM matched the phase velocity, in most cases, within the range of experimental error of about 3%. The WT agrees with the attenuation data only at low concentrations, and the disparity between theory and measured values increase with increasing concentration. The DGSCM agrees well with the attenuation data. (c) 2006 Acoustical Society of America.