Green's functions of an interfacial crack between two dissimilar piezoelectric media

Based on the permeable crack model, the Green's function of an interfacial crack between two dissimilar piezoelectric media is first presented by mean s of the Stroh formalism. Then, the electric field inside the crack and the fundamental solution of field intensity factor near the crack tips are obt ained in an explicit closed-form. As special examples, several Green's func tions are given for the cases of a crack in a homogeneous piezoelectric mat erial, an interfacial crack between two dissimilar purely-elastic media, an d a bimaterial of piezoelectric materials, respectively. It is shown in the general case that all the field variables near the crack-tips are singular and oscillatory, and such is the case for the electric field inside the cr ack when approaching to the crack-tips from on the crack faces. In addition , the relation between the field intensity factor vector of an impermeable crack and that of a permeable crack is established in the general cases. (C ) 2001 Elsevier Science Ltd. All rights reserved.