Publication detail

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

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

Original Title

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

Type

journal article in Scopus

Language

English

Original Abstract

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.

Keywords

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

Authors

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

Released

15. 12. 2017

Publisher

Serbian Tribology Society

Location

Serbia

ISBN

0354-8996

Periodical

Tribology in Industry

Year of study

39

Number

4

State

Republic of Serbia

Pages from

506

Pages to

518

Pages count

13

URL

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

Full text in the Digital Library

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"
}