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Research Article | Open Access

Multi-scale simulation of three-dimensional thin-film lubrication

State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

For three-dimensional (3D) mono-layer molecular thin-film lubrication, the elasticity of the substrate affects the tribological behaviors of a thin fluid film confined by two solid substrates. To account for the elastic effects, this study establishes a multi-scale method that combines an atomistic description of the near region with a coarse-grained description of the far region of the solid substrate to simulate the thin-film lubrication. It is demonstrated that for a given temperature range and film-substrate coupling strength, the multi-scale method is in excellent agreement with the fully atomistic simulation. This study reveals that the elastic response of the substrate can be effectively rendered in the hybrid scheme. In the application of the multi-scale method to investigate the tribological properties of the multi-layer molecular thin-film lubrication, it is determined that the systematic static friction coefficient monotonously decreases as the molecular layer thickness in the fluid film increases. In comparison to the mono-layer molecular thin-film lubrication, the multi-layer molecular thin-film lubrication plays a role in reducing the friction and wear of the system.

Keywords

frictionthin-film lubricationfilm-substrate coupling strengthmulti-scale method

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Friction
Volume 9 Issue 3,
June 2021
Pages 471-487
DOI: 10.1007/s40544-019-0349-4
Cite this article:
WU Z. Multi-scale simulation of three-dimensional thin-film lubrication. Friction, 2021, 9(3): 471-487. https://doi.org/10.1007/s40544-019-0349-4

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Received: 02 November 2019
Revised: 25 November 2019
Accepted: 04 December 2019
Published: 06 August 2020
© The author(s) 2019

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