Detail publikace

Frictional response of lubricant in EHL contact under transient bi-directional shear loading

FRÝZA, J. ŠPERKA, P. KŘUPKA, I. HARTL, M.

Originální název

Frictional response of lubricant in EHL contact under transient bi-directional shear loading

Typ

článek v časopise ve Scopus, Jsc

Jazyk

angličtina

Originální abstrakt

Consideration of performance, efficiency and energy consumption is nowadays an inherent part of the design of every modern machine. These factors are mainly determined by mechanisms taking place within the lubricated contacts. Unfortunately, the physical origins of these mechanisms have been investigated exclusively for steady conditions that do not occur in actual contacts of machines affected by vibrations. This study presents novel experimental data describing friction in the elastohydrodynamically lubricated contact exposed to the main steady sliding motion along with lateral sliding micro-oscillations. Friction forces were measured simultaneously in two perpendicular directions of point contact. It is shown that the lubricant response in the main direction of motion suffers from shear thinning and thermal effects whereas its lateral response is isothermal Newtonian. Moreover, the lateral friction affects the friction in the main direction, but not vice versa, when the majority of shear flow is maintained in this main direction. These finding are attributed to the perturbation of structural arrangement of lubricant. The results also suggest that a response of mineral oils to shearing is anisotropic. A limiting shear stress is discussed since the total friction was not able to exceed a certain value.

Klíčová slova

Elastohydrodynamic lubrication; friction; shear flow; non-steady state; limiting shear stress

Autoři

FRÝZA, J.; ŠPERKA, P.; KŘUPKA, I.; HARTL, M.

Vydáno

15. 12. 2017

Nakladatel

Serbian Tribology Society

Místo

Serbia

ISSN

0354-8996

Periodikum

Tribology in Industry

Ročník

39

Číslo

4

Stát

Srbská republika

Strany od

506

Strany do

518

Strany počet

13

URL

http://www.tribology.fink.rs/journals/2017/2017-4/2017-4-10.html

Plný text v Digitální knihovně

http://hdl.handle.net/11012/70276

BibTex

@article{BUT141673,
  author="Josef {Frýza} and Petr {Šperka} and Ivan {Křupka} and Martin {Hartl}",
  title="Frictional response of lubricant in EHL contact under transient bi-directional shear loading",
  journal="Tribology in Industry",
  year="2017",
  volume="39",
  number="4",
  pages="506--518",
  doi="10.24874/ti.2017.39.04.10",
  issn="0354-8996",
  url="http://www.tribology.fink.rs/journals/2017/2017-4/2017-4-10.html"
}