Volume 156, 2012

On the three-term kinetic friction law in nanotribological systems

Abstract

A post-processing method, which maps the punctiform atoms in molecular dynamics (MD) simulations of boundary lubrication onto smoothed particles, is used to estimate the asperity contact area defined by the minimum cross-section of the formed solid bridges. It is then shown that this asperity contact area excellently agrees with the projected area resulting from a Voronoi tessellation of the corresponding contact zone, and that it can be applied to compute the constitutive system parameters of a three-term friction law, which is found to hold for any boundary-lubricated nanotribological system. Finally, an attempt is made to relate the load-independent friction offset observed in boundary-lubricated nanotribological systems without solid–solid contact to the structural order as measured by the entropy, which is estimated within the single macromolecule approach based on covariance (super)matrices of the carbon backbone atoms in the lubricant.

  • This article is part of the themed collection: Tribology

Article information

Article type
Paper
Submitted
25 Nov 2011
Accepted
23 Jan 2012
First published
23 Jan 2012

Faraday Discuss., 2012,156, 173-196

On the three-term kinetic friction law in nanotribological systems

A. Vernes, S. Eder, G. Vorlaufer and G. Betz, Faraday Discuss., 2012, 156, 173 DOI: 10.1039/C2FD00120A

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