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Horizontal shear surface waves in a functionally graded piezoelectric cylinder

Horizontal shear (SH) surface acoustic wave propagation is evaluated in a transversely isotropic functionally graded piezoelectric material (FGPM) cylinder with material parameters varying continuously along the radial direction. The power series method is used to solve the coupled governing equations with variable coefficients. We discuss the influence of gradient property of each material parameter on the phase velocities. The phase velocities for the electric open circuit are illustrated and the influences of the gradient coefficient of FGPM on the phase velocities are quantified. Results provide theoretical guidance not only for experimental measurement of material properties but also for nondestructive evaluation using the ultrasonic wave devices.