A Novel Method for Assessing Material Heterogeneity-Induced Interfacial Stress Singularities of Dissimilar Joints Under Normal Loading

Abstract

Interfacial stress singularities have a great effect on the strength, stiffness, and fracture behavior of dissimilar joints. Commonly used stress singularity assessment methods are based on the two-dimensional theory of elasticity, which is too complicated for design purposes. Three-dimensional (3-D) finite element analysis results show that the traditional method does not fully reflect the influence of material heterogeneity, especially Poisson’s ratio, on interfacial stress singularities. This paper presents an interfacial stress intensity factor based on the 3-D theory of elasticity, which characterizes the increasing rate of interfacial stress as the external force in dissimilar joints increases. Compared with traditional methods, the interfacial stress intensity factor proposed here provides a more accurate and efficient assessment of material heterogeneity-induced interfacial stress singularities and can be a valuable aid in determining the material properties in practice.