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

本项目重点研究结构部件之间接触的疲劳强度。根据两个合作机构以前的经验（开姆尼茨工业大学-压合接头；布拉格CTU -疲劳估计方面），提出了一项广泛的试验活动。它的定义是首先关注接触中引起的局部效应。对影响进行量化，并为每个影响寻找或重新定义具有最佳估计质量的解。局部效应表现为：(1)接触区域应力多轴性；(2)平均应力效应；(3)应力梯度效应；(4)滑移效应。在第一个层次之上，进一步定义了测试中增加复杂性的4个层次，以便它们可以作为后续结果分析的输入，并将它们集成到最终的过程中。在34CrNiMo6+QT上提出了一种测试方案（压合接头的轮毂除外），因此可以将部分影响合并到一个程序中。完整的计算程序对最复杂的压合接头进行了校核。

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.