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Microasperity model for elastohydrodynamic lubrication of a spinning ball on a flat surface

Author: Charles W Allen; Erwin V Zaretsky; United States. National Aeronautics and Space Administration.; Lewis Research Center.
Publisher: Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151], 1970.
Series: NASA technical note, D-6009.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Database:WorldCat
Summary:
A microasperity elastohydrodynamic (EHD) model was developed for a ball spinning without rolling on a f l a t surface. The theory was developed by using a sinusoidal surface model in conjunction with existing dry- contact deformation theory and point-contact elastohydrodynamic theory for the microasperities. The computed torques based on this model were compared with experimental torques using the NASA spinning  Read more...
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Details

Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Charles W Allen; Erwin V Zaretsky; United States. National Aeronautics and Space Administration.; Lewis Research Center.
OCLC Number: 57582415
Description: 19 pages : illustrations ; 27 cm.
Series Title: NASA technical note, D-6009.
Other Titles: NASA TN D-6009
Responsibility: Charles W. Allen and Erwin V. Zaretsky.

Abstract:

A microasperity elastohydrodynamic (EHD) model was developed for a ball spinning without rolling on a f l a t surface. The theory was developed by using a sinusoidal surface model in conjunction with existing dry- contact deformation theory and point-contact elastohydrodynamic theory for the microasperities. The computed torques based on this model were compared with experimental torques using the NASA spinning torque apparatus. Fair agreement was obtained between theoretical and experimental results below 300 000 psi maximum Hertz stress. Based on the model presented herein microasperity EHD lubrication does not appear to be a primary force in maintaining separation between the opposing surfaces.

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