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27-11-2018 | Computer Aided Engineering | Issue 2/2019

Production Engineering 2/2019

Fatigue analysis of rolled components considering transient cyclic material behaviour and residual stresses

Journal:
Production Engineering > Issue 2/2019
Authors:
David Kühne, Christina Guilleaume, Martha Seiler, Peter Hantschke, Franz Ellmer, Thomas Linse, Alexander Brosius, Markus Kästner

Abstract

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.

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