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On an experimental-computational approach for localised durability assessment of sliding contacts
Wear ( IF 5 ) Pub Date : 2021-08-14 , DOI: 10.1016/j.wear.2021.204068
Michael Pusterhofer 1 , Florian Grün 1
Affiliation  

Several approaches exist to manage the difficult task of assessing the time point of failure of a sliding contact. However, limitations to the freedom of the system design or the consideration of the loading history reduce the applicability of previous developments. Combined computational-experimental approaches, as they are already presented in literature for the prediction of stable linear wear, can provide much accurate results, also for the prediction of destabilization of tribo systems. The authors use such a combined approach to transfer the durability behaviour from an experimental model system (Ring-on-Disc) onto an arbitrary target application (Journal bearing geometry) with the same material combination. Internal tribo system interactions between the system components are obtained by the experimental model tester, while the consideration of different hydrodynamic and asperity contact pressure at the target system is managed in a computational way. With a cumulative damage approach, the different local load histories can be evaluated. The results visualize the locations on the journal bearing shell where destabilization, regarding a mild-severe wear transition or a seizure event with friction peak, will occur first. In combination with the validation tests at the journal bearing-target application it turns out, that already at a low cumulative damage coverage a macroscopic observable destabilization of wear and friction properties occurs.



中文翻译:

滑动接触局部耐久性评估的实验计算方法

存在多种方法来管理评估滑动接触故障时间点的艰巨任务。然而,系统设计自由度的限制或对加载历史的考虑降低了先前开发的适用性。结合计算-实验方法,正如它们已经在文献中提出的用于预测稳定线性磨损的方法,可以提供非常准确的结果,也可以用于预测摩擦系统的不稳定。作者使用这种组合方法将耐久性行为从实验模型系统(盘上环)转移到具有相同材料组合的任意目标应用(轴颈轴承几何结构)上。系统组件之间的内部摩擦系统相互作用由实验模型测试仪获得,而目标系统上不同的流体动力学和粗糙接触压力的考虑则以计算方式进行管理。使用累积损伤方法,可以评估不同的局部载荷历史。结果显示了轴颈轴承壳上的不稳定位置,如轻度到重度磨损过渡或具有摩擦峰值的咬合事件,将首先发生。结合轴颈轴承目标应用的验证测试,结果表明,在累积损伤覆盖率较低的情况下,磨损和摩擦特性的宏观可观察不稳定发生了。结果显示了轴颈轴承壳上的不稳定位置,即轻度至重度磨损过渡或具有摩擦峰值的咬合事件,将首先发生。结合轴颈轴承目标应用的验证测试,结果表明,在累积损伤覆盖率较低的情况下,磨损和摩擦特性的宏观可观察不稳定发生了。结果显示了轴颈轴承壳上的不稳定位置,即轻度至重度磨损过渡或具有摩擦峰值的咬合事件,将首先发生。结合轴颈轴承目标应用的验证测试,结果表明,在累积损伤覆盖率较低的情况下,磨损和摩擦特性的宏观可观察不稳定发生了。

更新日期:2021-08-19
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