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Correlation of elastohydrodynamic film thickness measurements for fluorocarbon type 2 ester, and polyphenyl ether lubricantsA minimum films thickness correlation applicable to heavily loaded elastohydrodynamic (EHD) contacts was formulated from experimental data obtained by an X-ray transmission technique. The correlation, based on data generated with fluorocarbon, type II ester, and polyphenyl ether lubricants, extends a previous analysis developed from data for a synthetic paraffinic oil. The resulting correlation represents the data of the four lubricants reasonably well over a large range of operating conditions. Contained within the derived relation is a factor to account for the high-load dependence displayed by the measurements beyond that which is provided for by the theory. Thermal corrections applied to a commonly used film thickness formula showed little improvement to the general disagreement that exists between theory and test. Choice of contact geometry and material are judged to have a relatively mild influence on the form of the semiempirical model.
Document ID
19750003278
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Loewenthal, S. H.
(NASA Lewis Research Center Cleveland, OH, United States)
Parker, R. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Zaretsky, E. V.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1974
Subject Category
Mechanical Engineering
Report/Patent Number
E-7954
NASA-TN-D-7825
Accession Number
75N11350
Funding Number(s)
PROJECT: RTOP 501-24
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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