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A dynamic rheological model for thin-film lubrication

Chinese Physics B 2013年第1期22卷 426-433页

作者：张向军黄颖郭岩宝田煜孟永钢 State Key Laboratory of Tribology Tsinghua University

In this study, the effects of the non-Newtonian rheological properties of the lubricant in a thin-film lubrication regime between smooth surfaces were investigated. The thin-film lubrication regime typically appears in Stribeck curves with a clearly observable minimum coefficient of friction （COF） and a low-COF region, which is desired for its lower energy dissipation. A dynamic rheology of the lubricant from the hydrodynamic lubrication regime to the thin-film lubrication regime was proposed based on the convected Maxwell constitutive equation. This rheology model includes the increased relaxation time and the yield stress of the confined lubricant thin film, as well as their dependences on the lubricant film thickness. The Deborah number （De number） was adopted to describe the liquid-solid transition of the confined lubricant thin film under shearing. Then a series of Stribeck curves were calculated based on Tichy＇s extended lubrication equations with a perturbation of the De number. The results show that the minimum COF points in the Stribeck curve correspond to a critical De number of 1.0, indicating a liquid-to-solid transition of the confined lubricant film. Furthermore, the two proposed parameters in the dynamic rheological model, namely negative slipping length b （indicating the lubricant interracial effect） and the characteristic relaxation time λ0, were found to determine the minimum COF and the width of the low-COF region, both of which were required to optimize the shape of the Stribeck curve. The developed dynamic theological model interprets the correlation between the rheological and interfacial properties of lubricant and its lubrication behavior in the thin-film regime.

关键词： rheology viscoelasticity Deborah number thin-film lubrication

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

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Friction 2021年第3期9卷 471-487页

作者： Zuobing WU State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

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 *** 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 *** 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 *** study reveals that the elastic response of the substrate can be effectively rendered in the hybrid *** 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 *** 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.

关键词： thin-film lubrication film-substrate coupling strength multi-scale method friction

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Assessment of Cold Rolling Lubricants by 3-D Stribeck Curves and Roll Bite Mimicking Tests

Assessment of Cold Rolling Lubricants by 3-D Stribeck Curves...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Smeulders Bas Research Scientist Quaker Chemical The Netherlands

In order to account for the plastic surface deformation occurring in cold rolling,a novel,3-D Stribeck curve is *** curve is characterised by three’anchor points’which represent（1）the friction in the boundary regime,（2）the friction in the elastohydrodynamic regime,and（3）the friction experienced in a thin lubricant *** operational numbers define the lubrication regime,representing（1）film formation in the inlet zone,governed among others by the process speed and（2）in-bite film formation facilitated by plastic surface deformation,governed among others by the sliding speed in the *** in the rolling process can be influenced by any of the 3 anchor points and 2 film formation mechanisms,all of which are influenced by the lubricant *** ideas behind the 3-D Stribeck curve can be used in a more targeted lubricant *** 3-D Stribeck curve can be measured in the laboratory,preferably for *** test methods were developed to investigate boundary lubrication of emulsions under severe conditions,mimicking frictional power intensity and flash temperatures in the roll *** correlations are found with performance in a pilot mill and a production mill.

关键词： plastic surface deformation boundary lubrication EHL thin-film lubrication wear

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