弱界面压电/压磁层状结构中的SH波  

SH WAVES IN A PIEZOELECTRIC/PIEZOMAGNETIC LAYERED HALF-SPACE WITH A WEAK INTERFACE

作　　者：赵星[1,2] 赵永茂[1] 刘金喜[1] 

机构地区：[1]石家庄铁道大学工程力学系,石家庄050043 [2]河北省交通安全与控制重点实验室,石家庄050043

出　　处：《力学学报》2011年第5期948-952,共5页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(10972147);长江学者和创新团队发展计划(IRT0971)资助项目~~

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.This paper investigates the dispersion characteristics of shear horizontal （SH） waves propagating in a piezoelectric/piezomagnetic layered half-space with a weak interface. The so-called ＂spring＂ model is used to describe the interracial property. The surface of the piezoelectric layer is electrically closed or open. The closes-form dispersion equation is derived, and the numerical examples are provided to show the influences of the interracial property and the electrical boundary conditions on the dispersive characteristics of SH waves. The results show that： （1） weak bonding lowers the propagation velocity, and it makes the dispersion curve of the first mode for the electrically closed condition have a minimum less than the velocity of the B-G surface wave; （2） when the surface of the piezoelectric layer is electrically open, the phase velocities of the first mode are always more than the bulk shear wave speed of the piezoelectric medium.

关 键 词：压电材料 压磁材料 层状结构 SH波 弱界面 相速度 频散特性 

分 类 号：O347.41[理学—固体力学]