Interaction of a piezoelectric screw dislocation with a blunt mode III crack in a piezoelectric material

摘要

The problem of a piezoelectric screw dislocation emitted from a blunt crack is dealt with in this paper. For an arbitrary distribution of the residual dislocation, the series-form solu tions are derived. The results show that the electric field strength inside the crack is in direct proportion to the jump value of electric potential, but independent of the jump value of displacement. The force acting on the dislocation decreases with the value of the dielec tric constant within the crack increasing. And the increase of the dielectric constant within the crack helps dislocation emission effectively.