Molecular dynamics characterization of thin film viscosity for EHL simulation

A. Martini*, Y. Liu, R. Q. Snurr, Q. J. Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Molecular simulations were used to characterize changes in lubricant viscosity that may occur during thin film elastohydrodynamic lubrication (EHL). Molecular dynamics simulations were performed at variable wall speed and film thickness such that the effects of both parameters could be evaluated. Using this approach it was found that the viscosity of thin films under large shear is subject to both shear thinning and oscillation with film thickness. A composite model was developed that incorporated both effects. The expected impact that this model might have on an EHL interface was evaluated using a continuum simulation. An overall decrease in viscosity with some oscillation near the interface edges was predicted due to the molecularly modeled thin film effects.

Original languageEnglish (US)
Pages (from-to)217-225
Number of pages9
JournalTribology Letters
Volume21
Issue number3
DOIs
StatePublished - Mar 2006

Keywords

  • EHL with non-Newtonian lubricants
  • Nanotribology
  • Viscosity

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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