An experimental/theoretical approach to modeling the viscous behavior of liquid lubricants under EHL conditions

N. Fang, L. Chang, G. J. Johnston, M. N. Webster, A. Jackson

Research output: Contribution to journalArticle

Abstract

This paper presents an experimental/theoretical approach to modeling the viscous behavior of liquid lubricants under elastohydrodynamic lubrication (EHL) conditions. The main feature of the approach is that the rheological variables at a single point in the EHL contact are used rather than their global averages. The local rheological variables are calculated using first-principle theories in conjunction with experimental traction data. They are then curve-fit into an Eyring-based rheological model, and the model parameters are determined by minimizing the error vector associated with the curve-fitting procedures. The modeling approach is evaluated both theoretically and experimentally. The theoretical evaluation suggests that the method of modeling is meaningful for median-to-high loading conditions of a Hertz peak pressure above 0.8 GPa. The experimental evaluation demonstrates that the approach may be used to study the rheological behavior of synthetic lubricants with various molecular structures.

Original languageEnglish (US)
Pages (from-to)769-778
Number of pages10
JournalTribology Series
Volume39
DOIs
StatePublished - 2001

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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