LAUSR

Forming processes generally lead to residual stresses. Compressive residual stresses can have a beneficial impact on the fatigue life of components, which is demonstrated here in terms of a skew-rolled hybrid shaft-hub connection. In order to set the basis for a systematic investigation of this effect, a strategy for the evaluation of the influence of residual stresses on the fatigue resistance of formed components is proposed. It involves the determination of the expectable residual stresses through a simulation of the forming process as well as a fatigue analysis. While state-of-the-art fatigue concepts assume unchanging cyclic material behaviour throughout the entire fatigue life of the component, this assumption is not adequate for residual stress-afflicted components. Hence, a generalization to transient cyclic material behaviour with an asymmetry in tension and compression is introduced.