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The propagation behavior of Love waves in a layered structure that includes a functionally graded material (FGM) substrate carrying a piezoelectric thin film is investigated. Analytical solutions are obtained for both constant and gradient dielectric coefficients in the FGM substrate. Numerical results show that the gradient dielectric coefficient decreases phase velocity in any mode, and the electromechanical...
The propagation of the transverse surface waves in an unbounded piezoelectric half-space with a viscous liquid layer between the half-space surface and an unattached electrode is analyzed. An exact dispersion relation is obtained from the equations of the linear theory of piezoelectricity. Results show that the wave speed is sensitive to the viscous coefficient, the mass density and the dielectric...
Theory of the propagation of transverse surface waves in piezoelectric ceramic/metal coupled media is developed. Dispersion equations relating phase velocity to material constants for the existence of various modes are obtained in simple mathematic form for a piezoelectric material of class 6 mm. Piezoelectricity allows a nonleaky but dispersive wave of one or two modes to exist under conditions when...
In this paper we analyze the existence of complete band gaps in periodic binary two-dimensional piezoelectric phononic crystals with {1-3} connectivity family from a point view of connectivity. For this structure and no wave-vector components parallel to the cylinders, there are two independent modes of vibration. One of them is the transverse polarization mode (Z mode) with the elastic displacement...
The existence and propagation of Bleustein-Gulyaev (B-G) waves in a functionally graded piezoelectric substrate with exponential variation is studied by analytical technique. The dispersion equations for the existence of the B-G waves with respect to phase velocity are obtained for both electrically open and short conditions. A detailed investigation of the effect of the gradient coefficient on dispersion...
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