MODELING AND TESTING FOR DESIGN AND DURABILITY OF TAPERED BIMETALLIC JOINTS

摘要

Tapered bimetallic joints are investigated with and without consideration of assembly stresses. First, an aluminum disk specimen with a steel tapered stud is designed to represent the typical tapered steel stud and aluminum knuckle assembly. The steel stud and the aluminum disk are then assembled together by interference fit. A three-dimensional finite element model is developed to understand the interaction between the steel stud and aluminum disk under the interference fit and the subsequent loads applied to the ball portion of the stud. The effects of the assembly on the stresses and strains in the aluminum disk due to the applied loads are investigated. The computational results show that the assembly can affect the stresses and strains near the bi-material interface under the applied load. The computational results are used to guide the experimental program for the determination of the durability of steel stud and aluminum knuckle assemblies with different taper angles, draw distances, and applied loads.