Interaction of a screw dislocation with a semi-infinite interfacial crack in a magneto-electro-elastic bi-material

摘要

The interaction between a screw dislocation and a semi-infinite interfacial crack in a transversely isotropic magnetoelectro-elastic bi-material is investigated. The dislocation line is perpendicular to the isotropic basal plane of the bimaterial. The elastic and electromagnetic fields induced by the dislocation are obtained through the use of the complex variable method together with the superposition scheme. The stress, electric displacement and magnetic intensity factors as well as the image exerted on the dislocation are given explicitly. We find that the intensity factors are expressed in terms of the so-called effective materials and the radial component of the image force is only dependent on the elastic modulus of the material with the dislocation. As an illustrative example, the bi-material that consists of piezoelectric and piezomagnetic phases is analyzed. (c) 2005 Elsevier Ltd. All rights reserved.