Characteristics of Singular Stress Distribution at a Vertex in Transversely Isotropic Piezoelectric Dissimilar Material Joints

概要

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Stress singularity frequently occurs at a vertex in an interface due to a discontinuity of materials. The stress singularity fields are one of the main factors responsible for debonding under mechanical or thermal loadings. The stress distribution near the vertex in the interface is very important to maintain the reliability of joints. In this paper, stress singularity at a vertex in transversely isotropic piezoelectric dissimilar material joints are analyzed. Eigen analysis based on FEM is used for stress singularity field analysis of piezoelectric dissimilar material joints. The eigen equation is used for calculating the order of stress singularity, and the angular function of elastic displacement, electric potential, stress and electric displacement. Stress and electric displacement fields demonstrate that the values near stress singularity line of the joint are larger than that at the inner portion. From the numerical result, it is suggested that delamination of the interface may occur at the interface edge of the dissimilar piezoelectric material joints due to the higher angular function at the free edge.