Publication detail

Transition from plug-flow to linear speed profile near a dent in a rolling–sliding EHL contact

ŠPERKA, P. KŘUPKA, I. HARTL, M.

Czech title

Přechod z profilu toku plug-flow na lineární v okolí vtisku v EHL kontaktu za podmínek skluzu mezi povrchy

English title

Transition from plug-flow to linear speed profile near a dent in a rolling–sliding EHL contact

Type

journal article in Web of Science

Language

en

Original abstract

The paper presents measurements of perturbed film variations during the passage across an EHL rolling–sliding contact. Perturbed film was produced by indentation on a ball. The data for increasing entrainment speed showed the change from steady to variable profile. A simple simulation of a film profile has provided an estimate of the through-film speed profile. The measured data can be explained by a transition from the plug-flow to the linear speed profile. It was found that the transition is occurring at different speed for two sliding cases. Two possible effects connected with an indentation impact on in-contact conditions were discussed.

Czech abstract

Tento článek se zabývá studiem toku maziva v bodovém elastohydrodynamickém kontaktu. Pozorována je dynamická změna rozložení tloušťky maziva vytékajícího z vtisku na povrchu za podmínek prokluzu mezi povrchy. Vývoj profilu tloušťky mazací vrstvy je porovnán se simulací za předpokladu rychlostního profilu. Naměřená data lze vysvětlit při uvážení přechodu od plug-flow k lineárnímu rychlostnímu profilu. Bylo zjištěno, že přechod nastává při rozdílné střední rychlosti povrchů u dvou různých orientací prokluzu. V článku jsou diskutovány dvě možná vysvětlení.

English abstract

The paper presents measurements of perturbed film variations during the passage across an EHL rolling–sliding contact. Perturbed film was produced by indentation on a ball. The data for increasing entrainment speed showed the change from steady to variable profile. A simple simulation of a film profile has provided an estimate of the through-film speed profile. The measured data can be explained by a transition from the plug-flow to the linear speed profile. It was found that the transition is occurring at different speed for two sliding cases. Two possible effects connected with an indentation impact on in-contact conditions were discussed.

Keywords in Czech

reologie maziva; smykový spád; lokalizace skluzu; chování uvnitř kontaktu

Keywords in English

Lubricant rheology; Shear rate; Shear localization; In-contact behavior

Released

31.08.2016

Publisher

Elsevier

ISSN

0301-679X

Volume

100

Number

1

Pages from–to

344–350

Pages count

7

BIBTEX


@article{BUT134781,
  author="Petr {Šperka} and Ivan {Křupka} and Martin {Hartl},
  title="Transition from plug-flow to linear speed profile near a dent in a rolling–sliding EHL contact",
  year="2016",
  volume="100",
  number="1",
  month="August",
  pages="344--350",
  publisher="Elsevier",
  issn="0301-679X"
}