SH waves in a piezoelectric/piezomagnetic layered half-space with a weak interface
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摘要: 研究了弱界面压电层/压磁半空间结构中SH波的频散特性, 界面性能由``弹簧''模型表征, 压电层的表面考虑电学短路和电学开路两种边界条件. 推导了显函形式的频散方程, 并结合算例分析了界面性能和电学边界条件对SH波传播特性的影响. 数值结果表明: 弱界面降低了SH波传播的相速度; 对于短路电边界条件, 弱界面可以使一阶模态的相速度小于B-G表面波的速度; 对于开路电边界条件, 一阶模态的相速度总是大于剪切体波的波速.
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关键词:
- 频散特性
Abstract: This paper investigates the dispersioncharacteristics of shear horizontal (SH) waves propagating in apiezoelectric/piezomagnetic layered half-space with a weak interface. Theso-called ``spring'' model is used to describe the interfacial property. Thesurface of the piezoelectric layer is electrically closed or open. Thecloses-form dispersion equation is derived, and the numerical examples areprovided to show the influences of the interfacial property and theelectrical boundary conditions on the dispersive characteristics of SHwaves. The results show that: (1) weak bonding lowers the propagationvelocity, and it makes the dispersion curve of the first mode for theelectrically closed condition have a minimum less than the velocity of theB-G surface wave; (2) when the surface of the piezoelectric layer iselectrically open, the phase velocities of the first mode are always morethan the bulk shear wave speed of the piezoelectric medium.-
Key words:
- dispersion characteristic
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