Affiliation:
1. Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, PA 15261
Abstract
Abstract
The friction behavior of Si3 N4 ceramic balls operating under ultra-low-speeds with velocity reversal is investigated. Twenty-one sets of exclusively ultra-low-speed operating conditions were examined that include rotational speeds in the range of .01–1 deg/s, normal loads varying from 81.6 to 185.4 N per ball, and two conventional lubricants: DTE 24 and SAE 20 oil. General trends for the friction torque behavior of ceramic balls were established. Theoretical expressions and empirical correlations are presented for evaluation of the steady torque, Ts, and the rest slope, σ. These relationships can be used in Dahl’s model to completely characterize the hysteresis friction behavior of ceramic balls. The results of the ceramic ball friction measurements were compared to that of steel balls operating under identical conditions. In addition, a series of experiments was conducted to extend the operating speeds from .01–500 deg/s. Under the conditions tested, the lubrication regimes from boundary to fluid-film were identified.
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference11 articles.
1. Bhushan
B.
,
and
SibleyL.,
1982, “Silicon Nitride Rolling Bearings for
Extreme Operating Conditions,” ASLE
Transactions, Vol. 25, No. 4, pp.
417–428.
2. Dahl, P. R., 1968, “A Solid Friction Model,” AFO
4695-67-C-D158, Aerospace Corporation.
3. Flom
D.
G.
, 1960,
“Rolling Friction of Polymeric Materials I.
Elastomers,” Journal of Applied Physics,
Vol. 31, pp.
306–314.
4. Kannel, J. W., and Dufrane, K. F., 1986, “Rolling
Element Bearings in Space,” Proceedings of the 20th Aerospace
Symposium, NASA, CP 2423, pp. 121–132.
5. Lovell
M.
R.
,
KhonsariM.
M., and
MarangoniR.
D., 1992,
“Evaluation of Ultra-Low-Speed Jitter in Rolling
Balls,” ASME JOURNAL OF TRIBOLOGY, Vol.
114, pp.
589–594.
Cited by
11 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献