Transverse Surface Waves in a Functionally Graded Substrate Carrying a 6mm Piezoelectric Material Layer

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概要

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• The propagation of transverse surface waves in a functionally graded material carrying a piezoelectric layer is investigated analytically. The material properties in the substrate change gradually with the depth coordinate. We here assume that all material properties of the substrate have the same exponential function distribution along the depth direction. The dispersion equations relating phase velocity to the material gradient in the substrate for the existence of the waves are obtained in a simple mathematic form for class 6mm piezoelectric materials. It is demonstrated that the material gradient in the elastic substrate significantly affects the phase velocity and cut-off frequency of long waves but has only negligible effects on short waves. The effects of the material gradient on the penetration depth and electromechanical coupling factor, which are two parameters of practical interest, are also calculated and plotted. The significant influence of the material gradient on the wave propagation behavior provides a potential factor for designing acoustic wave devices.

著者

• Hirose Sohichi

  Department Of Mechanical And Environmental Informatics Graduate School Of Information Science And Engineering Tokyo Institute Of Technology

• KISHIMOTO Kikuo

  Depatment of Mechanical Sciences and Engineering, Tokyo Institute of Technology

• QIAN Zheng-Hua

  Department of Mechanical and Environmental Informatics, Tokyo Institute of Technology

関連論文

• Transverse Surface Waves in a Functionally Graded Substrate Carrying a 6mm Piezoelectric Material Layer
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