压电材料中裂纹面电边界条件的适用性  

APPLICABILITY OF THE ELECTRICAL BOUNDARY CONDITIONS IN PIEZOELECTRIC CRACKS

作　　者：王保林[1] 韩杰才[1] 杜善义[1] 

机构地区：[1]哈尔滨工业大学复合材料研究所,哈尔滨150001

出　　处：《固体力学学报》2004年第4期399-403,共5页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金(10102004)资助.

摘　　要：先分析理想裂纹面电边界条件(包括导通型裂纹和不导通型裂纹),然后分析缺陷的厚度及其对尖端场的影响,用封闭形式的解表示出了缺陷厚度的影响.结果指出,裂纹长厚比对计算结果是有影响的,除非裂纹极扁,不可通裂纹边界条件可以给出合理的结果,而可通边界条件只有在一些限制条件下才适用.A slit crack and a notch of finite thickness in piezoelectric materials subjected to combined mechanical and electrical loads are studied. Here, a crack is defined as a notch or an elliptic cavity without thickness and the crack interior is filled with air or vacuum. The crack or notch is perpendicular to the poling direction of the medium. The ideal crack face electrical boundary conditions, i.e., the electrically permeable crack and electrically impermeable crack, are investigated firstly. Then the influence of notch thickness on the field intensity factors at the crack tips is obtained in closed-form. The results are compared with the ideal crack solutions. Some useful results are found.

关 键 词：边界条件 裂纹面 表示 压电材料 理想 限制条件 厚度 解表 影响 封闭 

分 类 号：TB39[一般工业技术—材料科学与工程]