Mixed elastohydrodynamic lubrication line-contact formulas with different surface patterns

The effect of surface pattern (orientation) on film thickness, asperity load ratio, and traction coefficient in line-contact EHL is studied. Numerical simulations results of the modified Reynolds—which takes into account the effect of surface roughness and its orientation—bulk deformation of the sur...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part J, Journal of engineering tribology Journal of engineering tribology, 2014-08, Vol.228 (8), p.849-859
Main Authors: Masjedi, M, Khonsari, MM
Format: Article
Language:English
Subjects:
Asperity
Coefficients
Deformation
Film thickness
Lubricants & lubrication
Mathematical models
Mechanical engineering
Orientation
Plastics
Surface roughness
Traction
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Summary:The effect of surface pattern (orientation) on film thickness, asperity load ratio, and traction coefficient in line-contact EHL is studied. Numerical simulations results of the modified Reynolds—which takes into account the effect of surface roughness and its orientation—bulk deformation of the surfaces, and statistical elasto-plastic deformation of the surface asperities are presented. It is shown that surface pattern influences the behavior of lubricant flow, which affects the film thickness and the asperity load. The results of more than 2000 simulations are used to develop expressions to quantify the effect of surface roughness pattern in estimating the film thickness and the asperity load ratio. As an illustrative example, the contact in spur gear teeth is studied to show the utility of the developed formulas. Moreover, the traction behavior is investigated by utilizing a thermo-elastohydrodynamic approach and it is shown how the surface pattern affects the hydrodynamic and asperity parts of the traction coefficient.
ISSN:1350-6501
2041-305X
DOI:10.1177/1350650114534228