Abstract
In this paper, we first discuss the development of the field of tribology, and highlight some of the main problems encountered in this area, such as lack of systematicness, loose correlation, and inadequate focus on the microscopic perspective. Then, we provide basic formulas of frictional mechanics while considering the friction effect on classical mechanics formulae. In order to carry out the frictional mechanics analysis, we first classify the interface. According to the size analysis of surface films, the manufacturing roughness of the surface, the contact width, and the roller radius of the rolling contact bearing, frictional mechanics has the features of interface mechanics, while interfaces are classified based on the presence or absence of a medium. Based on the classification, we further analyze the pressure and frictional stress of sliding and rolling friction problems without a medium, such as a slider, wedge key, and V belt. We also analyze problems with a medium, such as journal and rolling contact bearings. By comparing these results with those of classical mechanics without considering friction, we see that (1) friction causes deviations in the result for classical mechanics which does not consider friction, and (2) if the frictional stress and normal pressure affect each other, their interaction should be considered simultaneously. Finally, we summarize the friction problems, namely, sliding and rolling, with and without a medium, and deformed and non-deformed. From our analysis, we propose two conclusions. First, the frictional mechanics problem is a deviation of the classical mechanics problem, and secondly, frictional stress and normal pressure influence each other.
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Ping HUANG. He received his Ph.D degree in mechanical engineering from Tsinghua University, Beijing, China in 1989. He worked at the State Key Laboratory of Tribology at Tsinghua from 1989 to 1996, and joined the Mechanical Design and Theory at South China University of Technology since then. His current position is a professor of the laboratory. His research areas cover the measurements and numerical calculations of different lubrication conditions and the mechanism of interfacial micro-friction.
Qianqian YANG. She received her Bachelor degree in mechanical engineering in 2011 from South China University of Technology, Guangzhou, China. After then, she is a Ph.D candidate in mechanical design and theory at the same university. Her research area is mainly about non-Newtonian fluid lubrication.
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Huang, P., Yang, Q. Theory and contents of frictional mechanics. Friction 2, 27–39 (2014). https://doi.org/10.1007/s40544-013-0034-y
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DOI: https://doi.org/10.1007/s40544-013-0034-y