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      Combined effect of boundary layer formation and surface smoothing on friction and wear rate of lubricated point contacts during normal running-in processes

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          Abstract

          The combined effect of boundary layer formation and surface smoothing on friction and wear rate of metallic surfaces under lubricated point contact condition was investigated. The double trend of friction coefficient variations was revealed during running-in and sub-running-in processes. The evolution of surface topography was measured on-site using white-light interference profilometer and analyzed using bearing area curves. Comprehensive theoretical equations that explicitly express the contributions of boundary friction, adhesive friction and wear have been derived, and results obtained by these equations were compared with experimental observations. It is concluded that the theoretical models are quantitatively adequate to describe the combined effect of surface smoothing due to mechanical wear and formation of boundary films on the changes in friction and wear rate during normal running-in processes.

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          Most cited references 20

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          Contact and Rubbing of Flat Surfaces

           J. F. Archard (1953)
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            On the nature of running-in

             Peter Blau (2005)
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              Wear models and predictive equations: their form and content

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                Author and article information

                Journal
                Tsinghua Science and Technology
                Friction
                Tsinghua University Press (Xueyuan Building, Tsinghua University, Beijing 100084, China )
                2223-7690
                05 September 2018
                : 06
                : 03
                : 274-288 (pp. )
                Affiliations
                State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
                Author notes
                * Corresponding author: Yonggang MENG, E-mail: mengyg@ 123456tsinghua.edu.cn

                Yazhao ZHANG. He received his bachelor degree in agricultural mechanization and automation in 2014 from Jilin University, Changchun, China. After then, he was a PhD student in the State Key Laboratory of Tribology at Tsinghua University, Beijing, China. His research interests include mixed lubrication and running-in process.

                Alexander KOVALEV. He received his M.S. degree in physics from the Gomel State University, Gomel, Belarus in 1997. He has earned PhD degree in tribology and physics of solids in 2007 from Metal-Polymer Research Institute, Gomel, Belarus. His current position is a research fellow at State Key Laboratory of Tribology at Tsinghua University, China. His research focuses on micro/nano-tribology, contact mechanics, interfacial phenomena, surface characterization, etc.

                Yonggang MENG. He received his M.S. and PhD degrees in mechanical engineering from Kumamoto University, Japan, in 1986 and 1989, respectively. He joined the State Key Laboratory of Tribology at Tsinghua University from 1990. His current position is a professor and the director of the laboratory. His research areas cover the tribology of MEMS and hard disk drives, active control of friction and interfacial phenomena and nanomanufacturing.

                Article
                2223-7690-06-03-274
                10.1007/s40544-018-0228-4

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Page count
                Figures: 14, Tables: 0, References: 29, Pages: 15
                Categories
                Research Article

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