Losses and dispersion in ceramic piezocompozites

A comprehensive study including computer 3D simulation and experimental ultrasonic measurements of different composites structures was carried out. The results of simulation of longitudinal ultrasonic waves propagation in different visco-elastic composites (porous ceramics, ceramics/ceramics and ceramics/crystals) are presented. Anomalies of sound velocities and attenuation near corresponding elastic dispersion regions were found out. The simulation results were compared with the experimental data obtained by ultrasonic pulse-echo and through-transmit methods.