层状压电复合介质中的螺位错分析  

ANALYSIS OF SCREW DISLOCATION IN LAYER PIEZOELECTRIC MATERIAL

作　　者：孔艳平[1] 陈长虹[1] 刘灵灵[1] 段淑敏[1] 刘金喜[1] 

机构地区：[1]石家庄铁道学院工程力学系,石家庄050043

出　　处：《工程力学》2009年第9期208-214,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(10472074;10602039)

摘　　要：研究了层状压电复合介质中的螺位错与界面的相互作用,应用傅里叶变换的方法推导了弹性场、电场和像力的解析表达式。基于所得到的解,计算了应力和电位移的分布特征;分析了位错位置、压电效应和材料性能对界面应力以及像力的影响。结果表明:压电效应的存在可以改变位错与界面的相互作用机理;弹性常数的差异对界面应力有较大的影响。The electro-elastic interaction of a piezoelectric screw dislocation with interface is discussed in this paper. The elastic and electrical fields produced by a straight screw dislocation in layered piezoelectric half-space are derived through the use of Fourier transform. Based on the derived solutions, the distribution characteristics of the stresses and electric displacements are plotted. Numerical examples are presented to illustrate the influences of dislocation location, piezoelectric effect and material properties on the interracial stresses and image force. The obtained results show that： the piezoelectric effect is able to change the interaction of a screw dislocation with an interface and a free boundary; the difference of elastic constants has obvious influence on the interfacial stress.

关 键 词：压电材料 电弹场 螺位错 像力 傅里叶变换 

分 类 号：O346[理学—固体力学]