Film forming behavior in thin film lubrication at high speeds

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Abstract

The film forming condition may transit into thin film lubrication (TFL) at high speeds when it is under severe starvation. Central film thicknesses and film thickness profiles are obtained via a technique of relative optical interference intensity. These profiles show a critical film thickness lower than which the absolute values of the film thickness gradient against speed or time decrease. It is possible to be in the thin film lubrication mode under such conditions. The high speed flow drives the lubricant molecules to rearrange in TFL and critical film thickness higher than 100 nm is achieved. The viscosity is one of the main factors controlling the decreasing rate and the critical film thickness. This paper is designed to investigate the thin film lubrication behavior at high speeds.

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Boundary lubrication by adsorption film

Jun Zhang, Yonggang Meng (2015)

A complete understanding of the mechanism of boundary lubrication is a goal that scientists have been striving to achieve over the past century. Although this complicated process has been far from fully revealed, a general picture and its influencing factors have been elucidated, not only at the macroscopic scale but also at the nanoscale, which is sufficiently clear to provide effective instructions for a lubrication design in engineering and even to efficiently control the boundary lubrication properties. Herein, we provide a review on the main advances, especially the breakthroughs in uncovering the mysterious but useful process of boundary lubrication by adsorption film. Despite the existence of an enormous amount of knowledge, albeit unsystematic, acquired in this area, in the present review, an effort was made to clarify the mainline of leading perspectives and methodologies in revealing the fundamental problems inherent to boundary lubrication. The main content of this review includes the formation of boundary film, the effects of boundary film on the adhesion and friction of rough surfaces, the behavior of adsorption film in boundary lubrication, boundary lubrication at the nanoscale, and the active control of boundary lubrication, generally sequenced based on the real history of our understanding of this process over the past century, incorporated by related modern concepts and prospects.

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Sixty years of EHL

H A Spikes (2006)

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Energy dissipation in atomic-scale friction

Yuan-zhong Hu, Tian-bao Ma, Hui WANG (2013)

The mechanisms of energy dissipation are discussed in this paper by reviewing the models and research in atomic-scale friction. The study is undertaken to answer a fundamental question in the study of friction: How is frictional work dissipated, particularly in cases where material damage and wear are not involved. The initiation of energy dissipation, the role of structural commensurability, and the estimation of the interfacial shear strength have been examined in detail by introducing the Tomlinson model, the Frenkel-Kontorova model, and the cobblestone model, respectively. The discussion is extended to energy dissipation progress described in terms of phononic and electronic damping. The contributions from other mechanisms of dissipation such as viscoelastic relaxation and material wear are also included. As an example, we analyzed a specific process of dissipation in multilayer graphene, on the basis of results of molecular dynamics (MD) simulations, which reveal a reversible part of energy that circulates between the system and the external driver. This leads us to emphasize that it is crucial in future studies to clearly define the coefficient of dissipation.

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Author and article information

Journal

Journal ID (nlm-ta): Tsinghua Science and Technology

Title: Friction

Publisher: Tsinghua University Press (Xueyuan Building, Tsinghua University, Beijing 100084, China )

ISSN (Print): 2223-7690

Publication date (Print): 05 June 2018

Volume: 06

Issue: 02

Pages: 156-163 (pp. )

Affiliations

[1]State Key Laboratory of Tribology, Tsinghua University, Beijing 100086, China

Author notes

* Corresponding authors: Dan GUO, E-mail: guodan26@ 123456tsinghua.edu.cn

Jianbin LUO, E-mail: luojb@ 123456tsinghua.edu.cn

Jianbin LUO. He received his BEng degree from Northeastern University in 1982, and got his MEng degree from Xi’an University of Architecture and Technology in 1988. In 1994, he received his PhD degree from Tsinghua University and then joined the faculty of Tsinghua University. Prof. Jianbin Luo is an academician of the Chinese Academy of Sciences and a Yangtze River Scholar Distinguished Professor of Tsinghua University, Beijing, China. He was awarded the STLE International Award (2013), the Chinese National Technology Progress Prize (2008), the Chinese National Natural Science Prize (2001), and the Chinese National Invention Prize (1996). Prof. Luo has been engaged in the research of thin film lubrication and tribology in nanomanufacturing. He was invited as a keynote or plenary speaker for 20 times on the international conferences.

Dan GUO. She received the M.S. degree in engineering mechanics in 1995 from Xi’an Jiaotong University and Ph.D. degree in engineering mechanics in 1999 from Tsinghua University. She joined the State Key Laboratory of Tribology at Tsinghua University from 1999. Her current position is a professor and the deputy director of the laboratory. Her research areas cover the mechanism of interaction among nanoparticles, lubrication and failure mechanism under rigorous conditions, and movement behavior of confined-microfluidic.

He LIANG. She received her Ph.D. degree in 2015 from State Key Lab of Tribology, Tsinghua University, China. The same year she joined the Tribology Group at Imperial College London as a postdoc. Her research areas involve the mechanism of lubrication behaviour in lubricated contacts and in rolling element bearings at high speeds.

Article

Publisher ID: 2223-7690-06-02-156

DOI: 10.1007/s40544-017-0159-5

SO-VID: b3f90e4d-474f-4a54-b6a4-9873cb6b9f40

License:

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.