Model of scuffing based on the vulnerability of an elastohydrodynamic oil film to chemical degradation catalyzed by the contacting surfaces |
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| Authors: | Andrew W. Batchelor Gwidon W. Stachowiak |
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| Affiliation: | (1) School of Mechanical and Production Engineering, Nanyang Technological University, 2263, Singapore;(2) Department of Mechanical and Materials Engineering, University of Western Australia, 6009 Nedlands, Western Australia, Australia |
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| Abstract: | A model of scuffing is developed based on the premise that metallic surfaces can catalyze degradation of the lubricant film in situ. A failure mechanism for elastohydrodynamic films based on rapid decomposition of mineral and synthetic oils involving chemical reaction between entrapped oil and the containing surfaces is proposed. It is suggested that this destruction of the elastohydrodynamic oil film allows adhesion between nascent metal of opposing surfaces in the contact which in turn causes scuffing. Suppression of scuffing by the application of coatings that do not catalyze the oil decomposition and by the action of some lubricant additives which may block the catalytic effect of metallic surfaces is discussed. Effect of solid lubricant films and contaminant layers on scuffing is also described. |
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| Keywords: | scuffing catalytic effects oil chemical degradation EHL minimum dimensions of shearing nascent surfaces |
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