Abstract

General reductions in lubricant viscosities and increasing loads in machine components highlight the role of tribofilms in providing surface protection against scuffing. However, the relationship between the scuffing process and the growth and removal of tribofilm is not well understood. In this study, a multiphysics coupling model, which includes hydrodynamic lubrication, asperity contact, thermal effect, tribochemistry reaction, friction, and surface wear, was developed to capture the initiation of surface scuffing. Simulations and experiments for a piston ring and cylinder liner contact were conducted following a step-load sequence under different temperature conditions. The results show that high temperature and extreme load could induce the lubricant film collapse, which in turn triggers the breakdown of the tribofilm due to the significantly increased removal process. The failures of both lubricant film and tribofilm progress instantaneously in a coupling way, which finally leads to severe scuffing.

中文翻译：

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基于多物理场耦合模型的拖拽失效分析及实验验证

摘要

润滑剂粘度的普遍降低和机器部件负载的增加突出了摩擦膜在提供表面保护以防止磨损方面的作用。然而，磨损过程与摩擦膜的生长和去除之间的关系尚不清楚。在这项研究中，开发了一个多物理场耦合模型，其中包括流体动力润滑、粗糙接触、热效应、摩擦化学反应、摩擦和表面磨损，用于捕获表面划伤的起始情况。在不同温度条件下按照阶跃加载顺序进行活塞环和气缸套接触的模拟和实验。结果表明，高温和极端负载会导致润滑油膜塌陷，进而由​​于去除过程显着增加而引发摩擦膜的破裂。润滑膜和摩擦膜的失效以耦合方式瞬时进展，最终导致严重的擦伤。