Residual Stress Analysis of Al/Mg Compounds by Using the Hole Drilling Method

Abstract

The residual stress analyses of Al/Mg compounds were done using the hole drilling method with strain gage rosettes. The evaluation method used is based on an FE model, which includes the formation of the residual stress state by the cooling process of the coextruded rod with different coefficients of thermal expansion of the two basic materials. Because of the special stress state, it can be shown that the strain distribution versus the hole depth depends on the specimen height. The results in radia direction at the interface are low tensile stresses.