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Transactions: WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS
Transactions ID Number: 52-374
Full Name: Yongbin Zhang
Position: Professor
Age: ON
Sex: Male
Address: School of Mechanical and Energy engineering, Baiyun Campus, Changzhou University, 213016,Jiangsu Province, P. R. China
Country: CHINA
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E-mail address: engmech3@sina.com
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Title of the Paper: Performance of Truncated Surface Asperities in Hydrodynamic Lubrication
Authors as they appear in the Paper: Yongbin Zhang
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Number of paper pages: 17
Abstract: The hydrodynamic lubrication in the contact between a flattened engineering rough plane surface and a smooth plane surface is analytically studied for a one-dimensional problem. Both surfaces are elastic and parallel to one another. The flattened rough surface is treated as equivalent to a rough plane surface with uniformly distributed circular surface shape asperities evenly truncated on the top, characterized by the equivalent curvature radius of asperities and the equivalent initial width of the truncated asperity top. Both of these equivalent parameters are constant. For understanding the hydrodynamic lubrication performance between these two plane surfaces, the analysis is only required to be carried out for the elastohydrodynamic lubrication (EHL) in the contact between a truncated circular surface shape asperity and the smooth plane surface. For this EHL problem, an inlet zone analysis is taken for revealing the influences of the asperity truncation on the !
load-carrying capacity, the friction coefficient and the maximum asperity surface temperature rise of the elementary asperity EHL contact. It is found from the obtained results that the asperity truncation reduces the load-carrying capacity of the asperity EHL contact, this effect is significant for low rolling speeds or/and sufficiently heavy loads, while it is negligible for high rolling speeds and moderate loads. The asperity truncation increases the friction coefficient of the asperity EHL contact especially at light loads, while it only slightly increases the friction coefficient of the asperity EHL contact at relatively heavy loads. For relatively heavy loads, the asperity truncation can have a significant effect on the reduction of the maximum asperity surface temperature rise of the asperity EHL contact. From the obtained results, it is recommended to take the surface asperity truncated in hydrodynamic lubrication for high sliding speed and relatively heavy load con!
tacts for giving the benefit of considerablly reducing the maximum asp
erity surface temperature rise while maintaining the load-carrying capacity of the hydrodynamic lubricated contact.
Keywords: Hydrodynamic lubrication; Elastohydrodynamic lubrication; Surface asperity; Load-carrying capacity; Friction coefficient; Surface temperature rise
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