Article

# Love wave propagation in functionally graded piezoelectric material layer.

Piezoelectric Device Laboratory, Department of Mechanics and Engineering Science, School of Engineering, Mechanics and Materials Science Research Center, Ningbo University, Ningbo, Zhejiang 315211, China. <>

Ultrasonics (Impact Factor: 2.03). 04/2007; 46(1):13-22. DOI: 10.1016/j.ultras.2006.09.004 Source: PubMed

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**ABSTRACT:**The effect of functional graded piezoelectric materials on the propagation of thickness-twist waves is investigated through equations of the linear theory of piezoelectricity. The elastic and piezoelectric coefficients, dielectric permittivity, and mass density are assumed to change in a linear form but with different graded parameters along the wave propagation direction. We employ the power-series technique to solve the governing differential equations with variable coefficients attributed to the different graded parameters and prove the correction and convergence of this method. As a special case, the functional graded middle layer resulting from piezoelectric damage and material bonding is investigated. Piezoelectric damaged material can facilitate energy trapping, which is impossible in perfect materials. The increase in the damaged length and the reduction in the piezoelectric coefficient decrease the resonance frequency but increase the number of modes. Higher modes of thickness-twist waves appear periodically along the damaged length. Moreover, the displacement of the center of the damaged portion is neither symmetric nor anti-symmetric, unlike the non-graded plate. The conclusions are theoretically and practically significant for wave devices.Smart Materials and Structures 08/2013; 22(9):095021. · 2.02 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**The results on theoretical and numerical modeling of resonant piezoelectric devices in China are reviewed. Solutions to dynamic problems of the propagation of bulk acoustic waves (BAW), surface acoustic waves (SAW), vibrations of finite bodies, and analyses of specific devices are discussed. Results from both the ultrasonics community and mechanics researchers are included. It is hoped that the paper will be useful for the understanding, communication and collaboration between Chinese and foreign scholars. The paper may also be helpful for bridging the gap between ultrasonics and mechanics researchers on piezoelectricity research. The paper contains 316 references.Science in China Series G Physics Mechanics and Astronomy 51(12):1775-1807. · 1.41 Impact Factor -
##### Article: Love waves in a two-layered piezoelectric/elastic composite plate with an imperfect interface

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**ABSTRACT:**Based on the shear spring model, the propagation of Love wave in two-layered piezoelectric/elastic composite plates under the influence of interfacial defect is investigated. The piezoelectric layer is electrically shorted at both top and bottom surfaces. The wave form solutions of the piezoelectric and elastic layers are obtained, and the dispersion equation is derived by subjecting the boundary conditions and the continuity conditions to the obtained wave form solutions. Numerical results are performed for PZT4/aluminum composite plate. The phase velocities and the mode shapes of mechanical displacement and electric potential are illustrated graphically. The results show that both the interfacial defect and the thickness ratio between the piezoelectric and elastic layers have significant effect on the propagation characteristics of Love wave. One important feature is observed that the interfacial defect always decreases the phase velocities.Archive of Applied Mechanics 01/2013; 83(1). · 1.44 Impact Factor

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