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Record Details

Record 78 of 20662
The effect of surface roughness on the average film thickness between lubricated rollers
Author and Affiliation:
Chow, L. S. H.(Argonne National Laboratory, Argonne, Ill., United States)
Cheng, H. S.(Northwestern University, Evanston, Ill., United States)
Abstract: The Christensen theory of stochastic models for hydrodynamic lubrication of rough surfaces is extended to elastohydrodynamic lubrication between two rollers. The Grubin-type equation including asperity effects in the inlet region is derived. Solutions for the reduced pressure at the entrance as a function of the ratio of the average nominal film thickness to the rms surface roughness (in terms of standard deviation), have been obtained numerically. Results were obtained for purely transverse and purely longitudinal surface roughness for cases with or without slip. The reduced pressure is shown to decrease slightly by considering longitudinal surface roughness. Transverse surface roughness has a slight beneficial effect on the average film thickness at the inlet. The same approach was used to study the effect of surface roughness on lubrication between rigid rollers and lubrication of an infinitely-wide slider bearing. The effects of surface roughness are shown to be similar to those found in elastohydrodynamic contacts.
Publication Date: Jan 01, 1976
Document ID:
19760036978
(Acquired Dec 01, 1995)
Accession Number: 76A19944
Subject Category: MECHANICAL ENGINEERING
Report/Patent Number: ASME PAPER 76-LUB-B
Document Type: Journal Article
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Argonne National Lab.; IL, United States
Northwestern Univ.; Evanston, IL, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: BOUNDARY LUBRICATION; ELASTOHYDRODYNAMICS; FILM THICKNESS; ROLLING CONTACT LOADS; SURFACE ROUGHNESS EFFECTS; DIMENSIONLESS NUMBERS; FLUID FILMS; HYDRODYNAMIC EQUATIONS; RIGID STRUCTURES; ROLLERS; SLIDING CONTACT; STOCHASTIC PROCESSES
Imprint And Other Notes: (American Society of Mechanical Engineers, 1976.) ASME, Transactions, Series F - Journal of Lubrication Technology, vol. 98, Jan. 1976, p. 117-124. NASA-sponsored research.
Availability Source: Other Sources
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