0
RESEARCH PAPERS

On Stick-Slip and the Velocity Dependence of Friction at Low Speeds

[+] Author and Article Information
C. Gao, D. Kuhlmann-Wilsdorf

Department of Materials Science, University of Virginia, Charlottesville, VA 22901

J. Tribol 112(2), 354-360 (Apr 01, 1990) (7 pages) doi:10.1115/1.2920264 History: Received March 13, 1989; Online June 05, 2008

Abstract

Stick-slip is commonly ascribed to a difference between the static and dynamic coefficients of friction or at the least a strong negative slope of the friction/velocity curve at very small relative speeds. Other types of variable sliding have been ascribed to irregularities in local friction coefficients, to the excitation of resonance frequencies in oscillatory systems, and to local heating at contact spots. In the course of ongoing studies of metal-metal friction and contact resistance in the hoop apparatus, stick-slip, smooth sliding, somewhat disturbed harmonic oscillations, and a novel type of sliding dubbed “negative stick slip” have been examined. The coefficient of friction (μ) is again found to drop with decreasing ambient pressure, and the velocity dependence of μ determined directly from smooth sliding in vacuum shows an unexpected steep rise at low velocities. Both of these observations are in contradiction with the adhesive model of wear. Negative stick-slip suggests a still more complex μ(νrel ) dependence which, however, appears to be compatible with the measurements. At any rate, negative stick-slip cannot be explained by any previously proposed models.

Copyright © 1990 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In