Publication detail

Quantitative elastohydrodynamic film forming for a gear oil with complex shear-thinning

BAIR, S. HABCHI, W. SPERKA, P. HARTL, M.

English title

Quantitative elastohydrodynamic film forming for a gear oil with complex shear-thinning

Type

WoS Article

Language

en

Original abstract

Perhaps the most thorough characterization of the elevated pressure properties of any commercial EHL lubricant is presented here for a gear oil. Compressibility, thermal conductivity, and low-shear viscosity were measured. Of particular interest is the shear dependence of viscosity, measured across four decades of stress, which shows two transitions each with a specific value of power-law exponent. An attempt to capture a suspected third transition at very high stress resulted in mechanical degradation of the liquid in the viscometer. Numerical simulations of a point contact between a steel ball and a glass disc showed good agreement over a range of slide-to-roll ratio for the measured central thickness. The agreement for the minimum thickness was excellent. A new result is that shear-thinning of a higher molecular weight component that occurs from 3 to 200 kPa had little effect on the film thickness and could therefore be neglected in a film thickness calculation.

Keywords in English

elastohydrodynamic film thickness, elastohydrodynamic lubrication, rheology, shear-thinning, compressibility

Released

2016-03-31

Publisher

SAGE Publications

ISSN

1350-6501

Journal

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY

Volume

230

Number

3

Pages from–to

289–299

Pages count

11

BIBTEX


@article{BUT134841,
  author="BAIR, S. and HABCHI, W. and SPERKA, P. and HARTL, M.",
  title="Quantitative elastohydrodynamic film forming for a gear oil with complex shear-thinning",
  journal="PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY",
  year="2016",
  volume="230",
  number="3",
  pages="289--299",
  doi="10.1177/1350650115600185",
  issn="1350-6501",
  url="http://journals.sagepub.com/doi/abs/10.1177/1350650115600185"
}