Scale Effects of Surface-Texture Distribution on Lubrication and Friction

IF 3.3 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2025-06-21 DOI:10.1007/s11249-025-02020-0

Xin Pei

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Abstract

Machining-induced textures featuring plowing-generated grooves show wavelength variations dependent on cutting precision and feed rates, which may influence tribological performance. In this study, a mixed elastohydrodynamic (EHL) model was developed through the systematic integration of critical tribological parameters, including contact geometry, elastic deformation, lubricant properties, and thermal transport properties. The roughness is simplified using a sinusoidal function. Through extensive numerical analysis, we found that the film thickness and friction coefficient exhibited a strong non-linear relationship with changes in the texture density of the contact surface. Both lubrication and friction deteriorated in a non-monotonic manner. This mechanism was attributed to changes in the inlet micro-topography caused by variations in texture density and the number of sinusoidal asperities actively participating in contact. Additionally, lubrication and friction characteristics under different distribution scales were analyzed with variations in speed, load, and slide-roll ratio (SRR). The simulations showed that the scale effect of surface texture weakened under high-speed and heavy-load conditions, whereas it became more pronounced under low-speed and light-load conditions.

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表面织构分布对润滑和摩擦的尺度效应

加工诱导的纹理具有犁耕产生的凹槽，其波长随切削精度和进给速率而变化，这可能会影响摩擦学性能。在这项研究中，通过系统集成关键摩擦学参数，包括接触几何、弹性变形、润滑剂性能和热传递性能，建立了一个混合弹流动力学（EHL）模型。粗糙度用正弦函数简化。通过广泛的数值分析，我们发现薄膜厚度和摩擦系数与接触面织构密度的变化呈强烈的非线性关系。润滑和摩擦都以非单调的方式恶化。这一机制归因于织构密度的变化和主动参与接触的正弦凸起数量的变化引起了入口微形貌的变化。此外，还分析了不同分布尺度下的润滑和摩擦特性，包括速度、载荷和滑辊比（SRR）的变化。模拟结果表明，高速和重载条件下，表面织构的尺度效应减弱，低速和轻载条件下，表面织构的尺度效应更加明显。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.