Abstract
The present paper analyzes the propagation of plane waves in an infinite pyroelectric medium. In order to consider the real situation, a new thermo-electric-elastic model with viscous effect is presented. The theoretical analysis shows that the elastic viscous effect and the Fourier’s law are in the same level in the evolution equations. So, the thermal viscous effect in Cattaneo’s equation belongs to a second-order effect. Numerical calculations are performed for pyroelectric material BaTiO3 using three models (Kaliski–Lord–Shulman theory, inertial entropy theory and inertial entropy with viscous effect). Results show that the elastic viscous relaxation time τ 0 plays a large role on the mechanical waves and admits mechanical waves decaying in propagation process. The effects of the thermo-relaxation time τ s on the attenuation of mechanical waves are also researched and discussed in detail.
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Zhou, ZD., Yang, FP. Plane waves in pyroelectrics with viscous effect. Acta Mech 225, 509–521 (2014). https://doi.org/10.1007/s00707-013-0962-7
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DOI: https://doi.org/10.1007/s00707-013-0962-7