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  4. Boundary lubrication of heterogeneous surfaces and the onset of cavitation in frictional contacts
 
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2016
Journal Article
Title

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

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.
Author(s)
Savio, D.
Pastewka, L.
Gumbsch, P.
Journal
Science advances  
Funder
Deutsche Forschungsgemeinschaft DFG  
Deutsche Forschungsgemeinschaft DFG  
Open Access
Link
Link
DOI
10.1126/sciadv.1501585
Additional full text version
Landing Page
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • boundary lubrication

  • confined fluid

  • wall slip

  • surface heterogeneity

  • cavitation

  • reynolds equation

  • Molecular dynamics

  • tribology

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