Abstract
This paper deals with the propagation of bending waves along the free edge of a piezoelectric sandwich plate. The structure consists of a piezoelectric layer sandwiched between two metal layers. The first-order Zig-Zag approximation for in-plane displacements through the thickness of each layer is used. Interfacial continuity of the displacement and the transverse shear stress between the piezoelectric layer and the metal layer is ensured which is very important and also experienced by layered structures. The number of independent unknown variables is reduced from 14 to 4 by using the interfacial continuity and the zero shear stresses conditions at the top and bottom surfaces. The governing equations and corresponding boundary conditions are derived using Hamiltonian principle. The dispersion relations for electrically open and shorted boundary conditions imposed at the edge of the semi-infinite piezoelectric sandwich plate are obtained. The effects of electrical edge condition, layer thickness ratio and material property on dispersion characteristics of the localized bending waves are discussed. The numerical results show that the electrical edge condition has significant influence on dispersion property compared to edge wave in a piezoelectric single-layer plate. The phase velocity and the localization of bending edge wave significantly depend on the thickness of metal layer, and a thick metal layer can result in a high wave velocity and a strong localization. The phase velocity of bending wave is positively related to the velocities of classical Rayleigh surface wave in piezoelectric half-space and metal half-space under plane strain.
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Acknowledgements
This study is supported by the National Natural Science Foundation of China (No. 11872041) and the Top-notch Young Talent Program of Hebei Province Education Department of China (No. BJK2022055).
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Appendices
Appendix A
Expressions of the axial forces, shearing force, bending moments and twisting moment in Eq. (14) are given by
where λu, μu and λl, μl are the Lame constants of upper and lower metal layer, respectively.
Appendix B
The nonzero elements of matrix Q in Eq. (24) are given by.
\(\begin{aligned} Q_{11} = \; & n^{l} \left( {\lambda^{l} + 2\mu^{l} } \right) + n^{u} \left( {\lambda^{u} + 2\mu^{u} } \right) + c_{11} \\ & + p^{2} \left( {n^{l} \mu^{l} + n^{u} \mu^{u} + c_{66} } \right) - 2c^{2} \left( {n^{l} \rho^{l} + n^{u} \rho^{u} + \rho^{m} } \right) \\ \end{aligned}\),
\(Q_{12} = p\left( {n^{l} \mu^{l} + n^{u} \mu^{u} + c_{12} + c_{66} } \right)\),
\(\begin{aligned} Q_{13} = \; & \xi \left( {\lambda^{l} + 2\mu^{l} } \right)\frac{{n^{l} \left( {n^{l} + 1} \right)}}{2} - \xi \left( {\lambda^{u} + 2\mu^{u} } \right)\frac{{n^{u} \left( {n^{u} + 1} \right)}}{2} \\ & + \xi p^{2} n^{l} \left( {n^{l} + 1} \right)\mu^{l} - \xi p^{2} n^{u} \left( {n^{u} + 1} \right)\mu^{u} + \xi c^{2} n^{u} \left( {n^{u} + 1} \right)\rho^{u} - \xi c^{2} n^{l} \left( {n^{l} + 1} \right)\rho^{l} \\ \end{aligned}\),
\(Q_{21} = p\left( {n^{l} \mu^{l} + n^{u} \mu^{u} + c_{12} + c_{66} } \right)\),
\(\begin{aligned} Q_{22} = \; & p^{2} n^{l} \left( {\lambda^{l} + 2\mu^{l} } \right) + p^{2} n^{u} \left( {\lambda^{u} + 2\mu^{u} } \right) \\ & + p^{2} c_{11} + n^{l} \mu^{l} + n^{u} \mu^{u} + c_{66} - 2c^{2} \left( {n^{l} \rho^{l} + n^{u} \rho^{u} + \rho^{m} } \right) \\ \end{aligned}\),
\(\begin{aligned} Q_{23} = \; & \xi p^{3} \left( {\lambda^{l} + 2\mu^{l} } \right)\frac{{n^{l} \left( {n^{l} + 1} \right)}}{2} - \xi p^{3} \left( {\lambda^{u} + 2\mu^{u} } \right)\frac{{n^{u} \left( {n^{u} + 1} \right)}}{2} \\ & + \xi pn^{l} \left( {n^{l} + 1} \right)\mu^{l} - \xi pn^{u} \left( {n^{u} + 1} \right)\mu^{u} + p\xi c^{2} n^{u} \left( {n^{u} + 1} \right)\rho^{u} - p\xi c^{2} n^{l} \left( {n^{l} + 1} \right)\rho^{l} \\ \end{aligned}\),
\(\begin{aligned} Q_{31} = \; & - \left( {\lambda^{l} + 2\mu^{l} } \right)\frac{{n^{l} \left( {n^{l} + 1} \right)}}{2} + \left( {\lambda^{u} + 2\mu^{u} } \right)\frac{{n^{u} \left( {n^{u} + 1} \right)}}{2} \\ & - p^{2} \mu^{l} \frac{{n^{l} \left( {n^{l} + 1} \right)}}{2} + p^{2} \mu^{u} \frac{{n^{u} \left( {n^{u} + 1} \right)}}{2} - 2c^{2} n^{u} \left( {n^{u} + 1} \right)\rho^{u} - 2c^{2} n^{l} \left( {n^{l} + 1} \right)\rho^{l} \\ \end{aligned}\),
\(\begin{aligned} Q_{32} = \; & - p^{3} \left( {\lambda^{l} + 2\mu^{l} } \right)\frac{{n^{l} \left( {n^{l} + 1} \right)}}{2} + p^{3} \left( {\lambda^{u} + 2\mu^{u} } \right)\frac{{n^{u} \left( {n^{u} + 1} \right)}}{2} \\ & - p\mu^{l} \frac{{n^{l} \left( {n^{l} + 1} \right)}}{2} + p\mu^{u} \frac{{n^{u} \left( {n^{u} + 1} \right)}}{2} - pc^{2} n^{u} \left( {n^{u} + 1} \right)\rho^{u} + pc^{2} n^{l} \left( {n^{l} + 1} \right)\rho^{l} \\ \end{aligned}\),
\(\begin{aligned} Q_{33} = \; & - \xi \left( {1 + p^{4} } \right)\left( {\lambda^{l} + 2\mu^{l} } \right)\frac{{3n^{l} + 6n^{l2} + 4n^{l3} }}{12} \\ & - \xi \left( {1 + p^{4} } \right)\left( {\lambda^{u} + 2\mu^{u} } \right)\frac{{3n^{u} + 6n^{u2} + 4n^{u3} }}{12} - \xi \left( {1 + p^{4} } \right)\frac{{\left( {c_{11} + c_{12} } \right)}}{12} + \\ & - \xi p^{2} \mu^{l} \frac{{3n^{l} + 6n^{l2} + 4n^{l3} }}{12} - \xi p^{2} \mu^{u} \frac{{3n^{u} + 6n^{u2} + 4n^{u3} }}{12} - \xi p^{2} \frac{{c_{66} }}{6} \\ & + 2\xi^{ - 1} c^{2} \left( {n^{l} \rho^{l} + n^{u} \rho^{u} + \rho^{m} } \right) + \xi \left( {c^{2} + p^{2} c^{2} } \right)\rho^{l} \frac{{3n^{l} + 6n^{l2} + 4n^{l3} }}{6} \\ & + \xi \left( {c^{2} + p^{2} c^{2} } \right)\rho^{u} \frac{{3n^{u} + 6n^{u2} + 4n^{u3} }}{6} + \xi \left( {c^{2} + p^{2} c^{2} } \right)\frac{{\rho^{m} }}{6} \\ \end{aligned}\),
\(Q_{34} = - 2\xi^{ - 2} \left( {1 + p^{2} } \right)\frac{{e_{31} }}{\pi } \,\), \(Q_{43} = 2\left( {1 + p^{2} } \right)\frac{{e_{31}^{{}} }}{\pi }\), \(Q_{44} = - \left( {1 + p^{2} } \right)\frac{{s_{11}^{{}} }}{2} - \xi^{ - 2} \pi^{2} \frac{{s_{33}^{{}} }}{2}\).
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Nie, G., Zhuang, J., Liu, J. et al. Localized bending waves along the edge of a piezoelectric sandwich plate. Acta Mech 234, 3483–3498 (2023). https://doi.org/10.1007/s00707-023-03571-w
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DOI: https://doi.org/10.1007/s00707-023-03571-w