Simulation of stress fields in brazed joints from dissimilar materials

摘要

Finite element method was used to study the geometry and combination of properties on the stress fields in two- and three-layer joints of bar type. It is found that longitudinal stresses have maximal values on the interface, maximal stresses do not depend on the dimensions and extent of the joints and are quite accurately defined by the equations based on the plane section hypothesis. Transverse stresses are concentrated on the free (side) surface in the immediate vicinity of the joint surface. Reduction of the modulus of elasticity of at least one of the materials being joined, is a quite effective method of lowering the level of stresses in the entire component. Maximal tangential stresses depend to the greatest degree on the thickness of the intermediate layer and can be reduced by up to two time.