Analysis of intensity of singularity at a vertex in 3D transversely isotropic piezoelectric bimaterial joints by Boundary Element Method

The stress singularity fields are one of the main factors responsible for debonding under mechanical or thermal loading. Stress singularity frequently occurs at a vertex in an interface of joints due to a discontinuity of materials. Intensity of singularity at a vertex in transversely isotropic piezoelectric bimaterial joints has not been made clear until now. In this paper, intensity of singularity at a vertex is investigated in transversely isotropic piezoelectric bimaterial joints. The stress and electric displacement distributions on an interface and the intensity of singularity at the vertex are investigated using Boundary Element Method. From the numerical results, it is shown that the 3D intensity of singularity for stress and electric displacement increases with the increase of material thickness in joint.