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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This work was partially supported by NSFC under grant No. 51635009 and by the State Administration of Foreign Expert Affairs under grant No. DL2017QHDX001.
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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.
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Zhang, Y., Kovalev, A. & Meng, Y. Combined effect of boundary layer formation and surface smoothing on friction and wear rate of lubricated point contacts during normal running-in processes. Friction 6, 274–288 (2018). https://doi.org/10.1007/s40544-018-0228-4
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DOI: https://doi.org/10.1007/s40544-018-0228-4