INTERACTION BETWEEN A PIEZOELECTRIC SCREW DISLOCATION AND AN ELLIPTICAL INCLUSION WITH INTERFACIAL ELECTRICALLY CONDUCTIVE RIGID LINE

The electroelastic interaction between a piezoelectric screw dislocation and an elliptical inclusion containing an electrically conductive interfacial rigid line is investigated. A complex variable method for multiplying connected regions is developed, in terms of which explicit series solutions for the complex potentials and electroelastic fields in the matrix and the inclusion regions are derived. The image force acting on the piezoelectric screw dislocation is then calculated by using the generalized Peach-Koehler formula. The influence of rigid line geometry and the aspect ratio of the ellipse on the image force are discussed. The results show that the impact of the interfacial rigid line on the mobility and equilibrium position of the dislocation near an elliptical inclusion is significant. When the length of the interfacial rigid line goes up to a critical value, the existence of the rigid line can change the interaction mechanism between a screw dislocation and the piezoelectric elliptic inclusion. The effect of the length of the rigid line on the image force acting on the screw dislocation will increase with the increment of the aspect ratio of the ellipse.