细观结构特性对压电叠堆内部应力场的影响分析  

Analysis of Influence of Meso-Structure Characteristics on Internal Stress Field of Piezoelectric Stack

作　　者：姚佐聪 胡和平[1] 高乐[1] 张仕明 YAO Zuocong;HU Heping;GAO Le;ZHANG Shiming(China Helicopter Reasearch&Development Institute Jingdezhen 333001,China)

机构地区：[1]中国直升机设计研究所,江西景德镇333001

出　　处：《压电与声光》2023年第4期640-645,649,共7页Piezoelectrics & Acoustooptics

摘　　要：压电叠堆的内部应力场是影响其可靠性的主要因素之一。基于COMSOL Multiphysics有限元软件,建立了精细尺度的压电叠堆有限元计算模型,通过理论分析验证了模型的准确性。对比分析了不同电极构型、陶瓷层厚度以及有无过渡段等细观结构特性对叠堆内部应力场的影响。结果表明,两种电极构型压电叠堆的内部都存在应力集中现象,叉指电极型叠堆的最大应力集中值远高于全电极;改变陶瓷层的厚度不影响叠堆内部应力集中的分布位置,最大切向应力随厚度的增大而减小,最大法向应力随厚度增大而增大;设置过渡段陶瓷可以有效地减少过渡部位活性陶瓷的最大应力集中值,增强压电叠堆的可靠性。The internal stress field of the piezoelectric stack is one of the main factors affecting its reliability.Based on the Comsol Multiphysics finite element software,establishes the fine-scale finite element calculation model of piezoelectric stack is established,the accuracy of the model is verified through the theoretical analysis.The comparative analysis of the effects of the meso-structure characteristics such as different electrode configuration,ceramic layer thickness,and the presence or absence of transition segment on the internal stress field of the stack is carried out.The results show that the stress concentration exists in two kinds of electrode configurations of the piezoelectric stacks,and the maximum stress concentration value of the interdigitated electrode stack is much higher than that of the full electrode stack.The thickness of the ceramic layer does not affect the distribution position of the internal stress concentration of the stack,the maximum shear stress decreases with the increase of thickness,and the maximum normal stress increases with the increase of thickness.The maximum stress concentration value of active ceramics in the transition site can be effectively reduced by setting the transition segment ceramic,and enhance the reliability of piezoelectric stacked.

关 键 词：压电叠堆 有限元仿真 应力集中 电极 陶瓷厚度 

分 类 号：TM282[一般工业技术—材料科学与工程]