Abstract

Understanding dual-mode wear behavior, including fatigue and abrasive wear, is essential for determination of surface damage under the sliding-impact condition, which can induce early motion-pair failure. A new dual-mode wear model is presented in this article for plane–cylinder contact pairs with fractal surfaces. First, fractal theory is employed for elastic–plastic contact analysis of the mating surfaces. Then the negative inhibitory effect of the abrasive surface damage on subsurface fatigue crack propagation is considered to explore abrasion–fatigue interactions at the asperity level. Subsequently, dual-mode wear behaviors are derived for the asperity and fractal surface based on four wear-combination scenarios of the abrasive and fatigue mechanisms. Furthermore, the validity of the proposed prediction model is evaluated by comparisons between the expected results and laboratory tests with 100Cr6 plane and C45E4 cylinder steel pairs. The results show that the new model can reasonably explain the dual mode wear behavior and predict the wear rate of friction pairs. These insights can potentially help in guiding the tribological design of these dual-mode wear scenarios.

摘要

了解双模式磨损行为，包括疲劳和磨料磨损，对于确定滑动冲击条件下的表面损伤至关重要，这会导致早期运动副失效。本文提出了一种新的双模式磨损模型，用于具有分形表面的平面-圆柱接触对。首先，分形理论用于配合面的弹塑性接触分析。然后考虑磨料表面损伤对亚表面疲劳裂纹扩展的负面抑制作用，以探索粗糙水平的磨损 - 疲劳相互作用。随后，基于磨料和疲劳机制的四种磨损组合场景，推导出粗糙表面和分形表面的双模式磨损行为。此外，通过对100Cr6平面和C45E4圆柱钢对的预期结果和实验室测试进行比较，评估所提出的预测模型的有效性。结果表明，新模型能够合理解释双模磨损行为，预测摩擦副磨损率。这些见解可能有助于指导这些双模式磨损场景的摩擦学设计。