Inertia and Shear-Thinning Effects on Bearing Behavior With Impulsive Loads

[+] Author and Article Information
Benyebka Bou-Saïd, Pascal Ehret

Laboratoire de Mécanique des Contacts, URA CNRS 856, Institut National des Sciences Appliquées, 69621 Villeurbanne, France

J. Tribol 116(3), 535-540 (Jul 01, 1994) (6 pages) doi:10.1115/1.2928877 History: Received February 26, 1992; Revised July 06, 1993; Online June 05, 2008


The study of bearings subjected to impulsive loads have previously showed that inertia effects and surface accelerations play an important role in the bearing response. Although the lubricant was considered Newtonian, this assumption is no longer valid with modern lubricant. In industrial applications, mineral lubricants are added to several long soluble chains of polymer in order to conserve optimum properties under different operating conditions. The addition of these polymers results in the drop of viscosity under high shear-rate, in the range of 10−6 –10−8 s−1 . This study presents a continuation of previous works. It examines the influence of both effects, the decrease in viscosity and the fluid inertia, in a journal bearing under impulsive loads. Using the power-law model, the results show important differences in shaft responses compared to the Newtonian cases. Furthermore, in high shear-thinning effects, a reduction of lubricant capacity to absorb sudden dynamic loads is observed.

Copyright © 1994 by The American Society of Mechanical Engineers
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