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Elastohydrodynamic contacts. Effects of dents and grooves on traction and local film thicknessTraction and film thickness were simultaneously measured under sliding elastohydrodynamic (EHD) conditions. The influence of surface topography was investigated by using simulated surfaces produced by depressing dents and grooves in highly polished steel balls. Significant changes in traction occurred depending on the orientation of the surface defects and their location with respect to the contact region. The results can be explained in terms of changes in overall film thickness and redistribution of pressure within the contact region due to micro-EHD effects. It can be concluded that the traction capability of mechanical components operating in thin film lubrication can be enhanced particularly by surface topographical orientation perpendicular to the surface motion. Associated with the higher traction are increases in local shear stress and normal stress as well as an increase in temperature at asperity sites. It is postulated that the local surface topography can become involved in run in or failure initiation even without actual asperity contact.
Document ID
19830020182
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Wedeven, L. D. (NASA Lewis Research Center Cleveland, OH, United States)
Cusano, C. (Illinois Univ. Urbana, United States)
Date Acquired
September 4, 2013
Publication Date
June 1, 1983
Subject Category
Mechanical Engineering
Report/Patent Number
NASA-TP-2175
NAS 1.60:2175
E-1333
Accession Number
83N28453
Funding Number(s)
PROJECT: RTOP 505-32-1B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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