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

Savio, Daniele; Pastewka, Lars; Gumbsch, Peter

Abstract (englisch):
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.


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Young Investigator Network (YIN)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1126/sciadv.1501585
ISSN: 2375-2548
URN: urn:nbn:de:swb:90-537851
KITopen ID: 1000053785
Erschienen in Science Advances
Band 2
Heft 3
Seiten e1501585
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Boundary lubrication, confined fluid, wall slip, surface heterogeneity, cavitation, reynolds equation, molecular Dynamics, tribology
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