Rheology of Lubricants in Real Bearing Contacts

[+] Author and Article Information
J. W. Kannel, S. S. Bupara

Lubrication Mechanics Section, Battelle’s Columbus Laboratories, Columbus, Ohio

J. of Lubrication Tech 97(2), 228-235 (Apr 01, 1975) (8 pages) doi:10.1115/1.3452562 History: Received June 27, 1974; Online October 18, 2010


Experimental traction-slip and lubricant film-thickness data have been determined for selected lubricants to provide information for use in conjunction with the design of lubricated machine elements. The traction-slip experiments were performed using a rolling-disk rheometer which closely simulates those conditions existent in real lubricated contacts; the film-thickness data were obtained using an X-ray technique. The range of experimental conditions included two rolling speeds (5000 and 10,000 rpm), several contact pressures [(690 – 2400 MN/m2 ) (100 to 350 ksi)], and three temperatures [(338, 366 and 423 K) (150, 200, and 300 F)]. The slip conditions imposed on the lubricants ranged as high as 6 m/s (1200 fpm) which is equivalent to a shear rate of approximately 0.5 × 108 sec−1 . Interpretative analyses have been developed to infer basic lubricant properties from the experimental data. These analyses include time delay parameters and “dynamic” pressure-viscosity parameters. The analytical treatment of the data provides: (1) a generalization of the experimental data to apply over a wider range of conditions than those actually covered, and (2) a basis for comparing lubricants and obtaining a more fundamental understanding of lubricant behavior.

Copyright © 1975 by ASME
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