Abstract
Analytical and numerical analyses are carried out for surface wave propagation in the layered PVDF piezoelectric structure under uniform and graded temperature field. Effects of thermo-electro-elastic properties, thermal stress and the temperature gradient on the surface wave propagation behaviors in SAW devices are discussed. Increase of temperature in the uniform temperature field or at the upper surface of the piezoelectric cover layer and exerting of a minus thermal stress can lead to the decrease of the phase velocity of the surface wave and the increase of the mode number. The results obtained indicate that the thermo-electro-elastic properties are the dominant factors affecting the thermal properties of the SAW devices, while the thermal stress and the graded temperature field are the subsidiary factors.
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