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力学学报  2015 

PMN-PT层/弹性基底结构中声表面波特性分析

DOI: 10.6052/0459-1879-14-299, PP. 493-502

Keywords: 单晶,金刚石,瑞利波,相速度,频散关系

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Abstract:

研究了PMN-PT压电层/弹性(金刚石)基底结构中表面波的传播特性,压电层表面是机械自由的,电学边界条件分为电学开路和电学短路,压电层与基底之间采用理想连接.得到了满足控制方程和边界条件的电弹场以及弹性波在结构中传播时的频散方程,通过数值算例分析了压电材料PMN-PT的极化方向对弹性波频散曲线和机电耦合系数的影响,以及不同极化方向时弹性位移和电势随结构深度方向的变化,结果可为PMN-PT压电材料在高频声表面波器件中的应用提供有价值的理论参考.

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