Lubricant Film Thickness in Rough Surface, Mixed Elastohydrodynamic ContactSource: Journal of Tribology:;2000:;volume( 122 ):;issue: 001::page 65DOI: 10.1115/1.555330Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A spacer layer imaging method has been employed to map lubricant film thickness in very thin film, rough surface, rolling elastohydrodynamic (EHD) contacts. A series of model roughnesses have been produced by depositing tiny ridges and bumps on a steel ball surface and the influence of these features on film thickness has been investigated at a range of rolling speeds. It has been shown that all the model surface features studied form speed-dependent, micro-EHD lubricating films, but the detailed shape and thickness of these films depends upon the geometry of the feature and the rolling speed. All model surface features also produce a net increase in mean film thickness, compared to the smooth surface, under operating conditions where the film thickness is less than the out-of-contact height of the surface feature studied. For a real, random, rough surface, however, mean film thickness is less than the smooth surface case. The film thickness mapping technique has also been used to measure the effective roughness of surfaces in lubricated contact. This shows that surfaces based on 2-D array of tiny circular bumps become rougher as the rolling speed and thus film thickness increases. However, real, rough surfaces appear to show a decrease of in-contact roughness with increasing rolling speed. [S0742-4787(00)01001-8]
keyword(s): Surface roughness , Film thickness , Lubricants , Electrohydrodynamics AND Thin films ,
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contributor author | G. Guangteng | |
contributor author | P. M. Cann | |
contributor author | A. V. Olver | |
contributor author | H. A. Spikes | |
date accessioned | 2017-05-09T00:03:28Z | |
date available | 2017-05-09T00:03:28Z | |
date copyright | January, 2000 | |
date issued | 2000 | |
identifier issn | 0742-4787 | |
identifier other | JOTRE9-28685#65_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/124381 | |
description abstract | A spacer layer imaging method has been employed to map lubricant film thickness in very thin film, rough surface, rolling elastohydrodynamic (EHD) contacts. A series of model roughnesses have been produced by depositing tiny ridges and bumps on a steel ball surface and the influence of these features on film thickness has been investigated at a range of rolling speeds. It has been shown that all the model surface features studied form speed-dependent, micro-EHD lubricating films, but the detailed shape and thickness of these films depends upon the geometry of the feature and the rolling speed. All model surface features also produce a net increase in mean film thickness, compared to the smooth surface, under operating conditions where the film thickness is less than the out-of-contact height of the surface feature studied. For a real, random, rough surface, however, mean film thickness is less than the smooth surface case. The film thickness mapping technique has also been used to measure the effective roughness of surfaces in lubricated contact. This shows that surfaces based on 2-D array of tiny circular bumps become rougher as the rolling speed and thus film thickness increases. However, real, rough surfaces appear to show a decrease of in-contact roughness with increasing rolling speed. [S0742-4787(00)01001-8] | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Lubricant Film Thickness in Rough Surface, Mixed Elastohydrodynamic Contact | |
type | Journal Paper | |
journal volume | 122 | |
journal issue | 1 | |
journal title | Journal of Tribology | |
identifier doi | 10.1115/1.555330 | |
journal fristpage | 65 | |
journal lastpage | 76 | |
identifier eissn | 1528-8897 | |
keywords | Surface roughness | |
keywords | Film thickness | |
keywords | Lubricants | |
keywords | Electrohydrodynamics AND Thin films | |
tree | Journal of Tribology:;2000:;volume( 122 ):;issue: 001 | |
contenttype | Fulltext |