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  • The low-shear viscosities of new oil and used (degraded) oil were measured to moderately high pressure. Shear-thinning flow curves were generated over a range of shear stress important to EHL film forming. Mechanical shear degradation only affected the viscosity at low shear stress while the viscosity at high stress remained unchanged. A recently published film thickness equation for double-Newtonian shear-thinning, employing the measured rheology, predicts the surprising result that thickness of the EHL film was not changed by the degradation although the low-shear viscosities were reduced substantially. Colorimetric measurements of the film thicknesses validate the predictions. Concern over the permanent loss in viscosity due to degradation may be misplaced when addressing EHL films.
  • The low-shear viscosities of new oil and used (degraded) oil were measured to moderately high pressure. Shear-thinning flow curves were generated over a range of shear stress important to EHL film forming. Mechanical shear degradation only affected the viscosity at low shear stress while the viscosity at high stress remained unchanged. A recently published film thickness equation for double-Newtonian shear-thinning, employing the measured rheology, predicts the surprising result that thickness of the EHL film was not changed by the degradation although the low-shear viscosities were reduced substantially. Colorimetric measurements of the film thicknesses validate the predictions. Concern over the permanent loss in viscosity due to degradation may be misplaced when addressing EHL films. (en)
Title
  • Quantitative elastohydrodynamic film thickness of mechanically degraded oil
  • Quantitative elastohydrodynamic film thickness of mechanically degraded oil (en)
skos:prefLabel
  • Quantitative elastohydrodynamic film thickness of mechanically degraded oil
  • Quantitative elastohydrodynamic film thickness of mechanically degraded oil (en)
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  • RIV/00216305:26210/13:PU106128!RIV14-MSM-26210___
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(LH11002)
http://linked.open...iv/cisloPeriodika
  • 8
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
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  • 101208
http://linked.open...ai/riv/idVysledku
  • RIV/00216305:26210/13:PU106128
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • Viscosity modifier, High pressure rheology, EHL film thickness, Mechanical shear degradation (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • NL - Nizozemsko
http://linked.open...ontrolniKodProRIV
  • [16FF1A0E9229]
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  • Tribology International
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http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 65
http://linked.open...iv/tvurceVysledku
  • Hartl, Martin
  • Křupka, Ivan
  • Šperka, Petr
issn
  • 0301-679X
number of pages
http://localhost/t...ganizacniJednotka
  • 26210
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