An experimental/theoretical approach to modelling the viscous behaviour of liquid lubricants in elastohydrodynamic lubrication contacts

N. Fang, Liming Chang, G. J. Johnson, M. N. Webster, A. Jackson

Research output: Contribution to journalArticlepeer-review

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Abstract

This paper presents an experimental/theoretical approach to modelling the viscous behaviour 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 fitted into an Eyring-based rheological model, and the model parameters are determined by minimizing the error vector associated with the curve-fitting procedures. The modelling approach is evaluated both theoretically and experimentally. The theoretical evaluation suggests that the method of modelling 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 behaviour of synthetic lubricants with various molecular structures.

Original languageEnglish (US)
Pages (from-to)311-318
Number of pages8
JournalProceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
Volume215
Issue number4
DOIs
StatePublished - Jan 1 2001

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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