携表面割痕的压电陶瓷柱体裂纹前缘奇异行为

研究了同时处于机械与电学载荷之下的压电陶瓷柱体表面裂纹前缘的应力场和电位移场。求得了应力及电位移的奇异性阶数和相应的两个强度因子。

Singular behaviors near crack border in a piezoceramics cylinder with a surface cut

In this paper the field distributions of stress and electric displacement near the surface cut border on a piezoelectric ceramics cylinder,which is located in a longitudinal electric field and subjected to a couple of torsional moments simultaneously,are investigated.The original problem is at first considered as such a model a piezoelectric half plane with an edge crack under condition of antiplane deformation,then two sets of dual integral equations from the corresponding boundary conditions are sloved,and the stress intensity factor,the electric displacement intensity factor of this problem are obtained analytically.The characteristic 1/r singular behaviors of stress and electric displacement components in the vicinty of the cut and the obvious coupling effect between mechanical and electric variables are discussed finally.