THE THERMAL STRESS ANALYSIS OF THE INTERFACIAL EDGE IN DISSIMILAR STRUCTURE AND THE EFFECTS OF GEOMETRIC SHAPE

摘要

This paper describes the analysis of the thermal stress concentration and the effects of geometrical shape in the interfacial edge by FEM. It is shown that the elevated stress in a dissimilar material caused by temperature is only restricted in a minor region of the interfacial edge, where the stress peak value and and the stress gradient are high. It is also found that narrowing the boundary angle can effectively reduce the peak value of stress components on the interfacial layer, especially the peeling stress σ_y, which is a condition of the debonding failure in the interface. θ=60, an obvious variation, proves that selecting a reasonable edge geometrical shape helps to reduce the value of the maximum stress. At last the methods of relaxing stress concentration and effects of the geometric blunt are also discussed.