Article

Propagation of shear horizontal surface waves in a layered piezoelectric half-space with an imperfect interface

Dept. of Eng. Mech., Shijiazhuang Railway Inst., Shijiazhuang, China
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control (Impact Factor: 1.5). 09/2010; DOI: 10.1109/TUFFC.2010.1627
Source: IEEE Xplore

ABSTRACT We investigate the dispersive behavior of shear horizontal (SH) surface waves propagating in a layered structure consisting of a piezoelectric layer and an elastic half-space, in which the top and bottom of the layer are electrically shorted. The interface between the layer and the half-space is assumed to be imperfect bonding. The degree of imperfection of the interface is described by the so-called shear-lag model. The dispersion equations are expressed in an explicit closed form. The phase velocities are calculated to show the influences of the interfacial imperfection and the material properties of piezoelectric layers on the dispersive characteristics.

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    DESCRIPTION: Dispersion of flexural waves in a compound solid cylinder containing a shear-spring-type imperfection between its constituents is investigated utilizing the three-dimensional equations and relations of the linear theory of elastodynamics. Attention is focused on the influence of the imperfection on dispersion curves. By using an analytical solution of corresponding field equations, dispersion equations for the cases considered are obtained. Based on numerical solutions of the equations, dispersion curves are constructed for a bi-material cylinder, consisting of steel and aluminum cylinders, for the first fundamental vibration mode. In particular, it is established that the type of imperfect contact conditions considered can give rise to additional branches of dispersion curve related to the fundamental mode. One of these branches approaches the dispersion curve obtained for a perfect interfacial contact, but the other disappears as the values shear-spring parameters decrease.
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