Superlubricity can only be achieved if the intra-bulk elastic interactions dominate interfacial shear forces at every single length-scale in a contact. Otherwise, there will be some type of plucking motion which will lead to friction-velocity relationships akin of Coulomb’s friction law. For nominally flat surfaces, it has been predicted theoretically and demonstrated experimentally that plucking motion and hence kinetic friction can be avoided under certain circumstances. We present theoretical arguments, why these findings may extend to fractal surfaces. The theories are checked by molecular dynamics simulations. It turns out that the roughness exponent and the absolute magnitude of the roughness both play a crucial role in determining whether there can be superlubricity.
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World Tribology Congress III
September 12–16, 2005
Washington, D.C., USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4202-9
PROCEEDINGS PAPER
A Theoretical and Computational Study of Superlubricity and the Role of the Roughness Exponent Available to Purchase
Martin H. Mu¨ser,
Martin H. Mu¨ser
University of Western Ontario, London, ON, Canada
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Carlos Campana
Carlos Campana
University of Western Ontario, London, ON, Canada
Search for other works by this author on:
Martin H. Mu¨ser
University of Western Ontario, London, ON, Canada
Carlos Campana
University of Western Ontario, London, ON, Canada
Paper No:
WTC2005-63868, pp. 435-436; 2 pages
Published Online:
November 17, 2008
Citation
Mu¨ser, MH, & Campana, C. "A Theoretical and Computational Study of Superlubricity and the Role of the Roughness Exponent." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 2. Washington, D.C., USA. September 12–16, 2005. pp. 435-436. ASME. https://doi.org/10.1115/WTC2005-63868
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