Modeling dynamic or kinetic friction for realistic engineering surfaces continues to be a challenge, partly due to the coupling between system dynamics and interfacial forces. In this paper, a dynamic friction coefficient model for realistic rough surfaces under external normal vibrations is developed. From the system dynamic model, the instantaneous time varying normal separation at the interface is obtained under normal harmonic excitation. Subsequently, the instantaneous dynamic contact and tangential (friction) forces are calculated as a function of the instantaneous normal separation. The dynamic friction coefficient defined as the ratio of the time varying friction to the interfacial normal forces that explicitly includes interfacial damping, is also calculated. The results show that a mean increase in the instantaneous normal separation may or may not lead to a decrease of the mean friction force and the mean friction coefficient, which is supported by published data. For unlubricated elastic sliding contact conditions considered in this paper, the effect of damping on the dynamic friction coefficient is found to be negligible, whereas loss of contact causes significant apparent dynamic friction force and dynamic friction coefficient reductions. Several different interpretations of the time varying dynamic friction coefficient are presented and the implications of using a simple constant value to represent the time varying dynamic friction coefficient are discussed.
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October 2003
Technical Papers
A Dynamic Friction Model for Unlubricated Rough Planar Surfaces
Xi Shi,
Xi Shi
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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Andreas A. Polycarpou
Andreas A. Polycarpou
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Search for other works by this author on:
Xi Shi
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Andreas A. Polycarpou
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division March 6, 2002 revised manuscript received December 11, 2002. Associate Editor: M. D. Bryant.
J. Tribol. Oct 2003, 125(4): 788-796 (9 pages)
Published Online: September 25, 2003
Article history
Received:
March 6, 2002
Revised:
December 11, 2002
Online:
September 25, 2003
Citation
Shi , X., and Polycarpou, A. A. (September 25, 2003). "A Dynamic Friction Model for Unlubricated Rough Planar Surfaces ." ASME. J. Tribol. October 2003; 125(4): 788–796. https://doi.org/10.1115/1.1573229
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