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Abstract
In this paper, a comprehensive study including computer 3D simulation, microstructural studies, and experimental measurements of different composites structures was carried out. The Wave 3000 finite differences software package was used for simulation. The results of simulation of longitudinal ultrasonic waves propagation in ceramics/crystal and ceramics/metal ceramic matrix composites are presented. Finite difference modeling made it possible to reveal the characteristic features of the propagation of longitudinal waves in inhomogeneous piezoelectrically active ceramic matrix composites. The simulation results were compared with the experimental data obtained by impedance spectroscopy and ultrasonic methods. Anomalies of complex elastic moduli near corresponding percolation thresholds and elastic dispersion regions were found out.
Acknowledgement
This work was supported by the Ministry of Education and Science of the Russian Federation: the basic parts of the state task, themes No 12.5425.2017/8.9, No 3.8863.2017/7.8.