磁电弹双材料条中螺位错与界面边裂纹的相互作用  

A SCREW DISLOCATION INTERACTING WITH AN INTERFACIAL EDGE CRACK IN A MAGNETO-ELECTRO-ELASTIC BI-MATERIAL STRIP

作　　者：齐敏[1] 刘金喜[1] 赵永茂[1] 

机构地区：[1]石家庄铁道学院工程力学系,河北石家庄050043

出　　处：《工程力学》2007年第11期25-31,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(10472074)

摘　　要：研究半无限长磁电弹双材料条中螺位错与界面边裂纹的相互作用。基于镜像原理和保角变换方法,得到了弹性场、电场和磁场的解析解,给出了应力、电位移、磁感应强度、应力强度因子以及像力的显函表达式。以压电-压磁双材料条形介质为例,分析了应力场、电位移和磁感应强度的分布特性,讨论了几何参数、压电和压磁效应对应力强度因子和像力的影响。The interaction between a screw dislocation and an interfacial edge crack in a magneto-electro-elastic （MEE） bi-material strip was investigated. By using the image dislocation principle and the conformal mapping method, the closed-form expressions of the elastic, electrical and magnetic fields induced by the dislocation are obtained. The intensity factors of stress, electrical displacement and magnetic induction as well as the image force acting on the dislocation are given explicitly. For the strip consisting of the piezoelectric and piezomagnetic phases, the characteristics of the stress, electric displacement and magnetic induction as well as the influences of geometric parameters and coupling effects on the interaction are analyzed in detail.

关 键 词：磁电弹材料 压电材料 压磁材料 螺位错 界面裂纹 

分 类 号：O343[理学—固体力学]