Procedure for fatigue estimation in contacts: Local multiaxial analysis of stress-related and tribological effects

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The project focuses on the research of fatigue strength in contacts between structural parts. Based on previous experience of both cooperating institutions (TU Chemnitz - press-fitted joints; CTU in Prague - fatigue estimation aspects), a broad experimental campaign is proposed. It is defined to focus first on partial effects induced in contacts. The effects are quantified and the solutions with best estimation quality are searched or newly defined for each of them. The partial effects are: (1) stress multiaxiality in the contact area; (2) mean stress effect; (3) effect of the stress gradient; (4) slip effect. On top of this first level, 4 further levels of increased complexity in testing are defined, so that they could serve as inputs for subsequent analysis of results and their integration into the final procedure. The tesing campaign is proposed on 34CrNiMo6+QT from one heat (except of hubs of press-fitted joints), thus the partial effects can be joined consequently into one procedure. The complete calculation procedure is checked for the most complex case of press fitted joints.