Research ArticleSURFACE SCIENCE

Boundary lubrication of heterogeneous surfaces and the onset of cavitation in frictional contacts

Science Advances  25 Mar 2016:
Vol. 2, no. 3, e1501585
DOI: 10.1126/sciadv.1501585

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Abstract

Surfaces can be slippery or sticky depending on surface chemistry and roughness. We demonstrate in atomistic simulations that regular and random slip patterns on a surface lead to pressure excursions within a lubricated contact that increase quadratically with decreasing contact separation. This is captured well by a simple hydrodynamic model including wall slip. We predict with this model that pressure changes for larger length scales and realistic frictional conditions can easily reach cavitation thresholds and significantly change the load-bearing capacity of a contact. Cavitation may therefore be the norm, not the exception, under boundary lubrication conditions.

Keywords
  • Boundary lubrication
  • confined fluid
  • wall slip
  • surface heterogeneity
  • cavitation
  • reynolds equation
  • molecular Dynamics
  • tribology

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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