Publication result detail

Experimental and numerical investigation on the behavior of transverse limited micro-grooves in EHL point contacts

ALI, F.; KANETA, M.; KŘUPKA, I.; HARTL, M.

Original Title

Experimental and numerical investigation on the behavior of transverse limited micro-grooves in EHL point contacts

English Title

Experimental and numerical investigation on the behavior of transverse limited micro-grooves in EHL point contacts

Type

WoS Article

Original Abstract

This study presents experimental and numerical investigations on the effects of transverse limited micro-grooves on the behavior of film thickness and friction in EHL point contacts. The tribological performance has been compared for smooth and textured surfaces in sliding and reciprocating motion and under starvation. The measurements were conducted by using a ball-on-disk tribometer equipped with a high speed camera and torque sensor. The results show that the transverse shallow micro-grooves with a length less than the diameter of the Hertzian contact are efficiently able to enhance the film thickness under different operating conditions. The beneficial effect under starved lubrication requires a mechanism for filling the depleted micro-grooves entering the contact with fresh lubricant. This mechanism can be attributed to the capillary effect in the inlet zone under starvation. The numerical simulation of the transient behavior of transverse limited micro-grooves shows agreement with experimental results. On the other hand, introducing micro-grooves as closed texture cells on one of rubbing surfaces results in a friction reduction in the reciprocating motion. The reduction of friction is substantially attributed to the film thickness enhancement.

English abstract

This study presents experimental and numerical investigations on the effects of transverse limited micro-grooves on the behavior of film thickness and friction in EHL point contacts. The tribological performance has been compared for smooth and textured surfaces in sliding and reciprocating motion and under starvation. The measurements were conducted by using a ball-on-disk tribometer equipped with a high speed camera and torque sensor. The results show that the transverse shallow micro-grooves with a length less than the diameter of the Hertzian contact are efficiently able to enhance the film thickness under different operating conditions. The beneficial effect under starved lubrication requires a mechanism for filling the depleted micro-grooves entering the contact with fresh lubricant. This mechanism can be attributed to the capillary effect in the inlet zone under starvation. The numerical simulation of the transient behavior of transverse limited micro-grooves shows agreement with experimental results. On the other hand, introducing micro-grooves as closed texture cells on one of rubbing surfaces results in a friction reduction in the reciprocating motion. The reduction of friction is substantially attributed to the film thickness enhancement.

Keywords

Elastohydrodynamic (EHL); Limited micro-grooves; Film thickness; Reciprocating motion

Key words in English

Elastohydrodynamic (EHL); Limited micro-grooves; Film thickness; Reciprocating motion

Authors

ALI, F.; KANETA, M.; KŘUPKA, I.; HARTL, M.

RIV year

2016

Released

06.04.2015

Publisher

Elsevier

Location

Holandsko

ISBN

0301-679X

Periodical

Tribology International

Volume

84

Number

4

State

United Kingdom of Great Britain and Northern Ireland

Pages from

81

Pages to

89

Pages count

9

BibTex

@article{BUT111248,
  author="Fadi {Ali} and Motohiro {Kaneta} and Ivan {Křupka} and Martin {Hartl}",
  title="Experimental and numerical investigation on the behavior of transverse limited micro-grooves in EHL point contacts",
  journal="Tribology International",
  year="2015",
  volume="84",
  number="4",
  pages="81--89",
  doi="10.1016/j.triboint.2014.11.025",
  issn="0301-679X"
}