Publication result detail

Ehl traction analysis of perfluoropolyether fluids based on bulk modulus

KANETA, M.; ŠPERKA, P.; KŘUPKA, I.; HARTL, M.

Original Title

Ehl traction analysis of perfluoropolyether fluids based on bulk modulus

English Title

Ehl traction analysis of perfluoropolyether fluids based on bulk modulus

Type

Peer-reviewed article not indexed in WoS or Scopus

Original Abstract

Using three kinds of commercial perfluoropolyether (PFPE) fluids, the authors carried out high pressure density test at the pressure up to 1.2 GPa. Tangent bulk modulus and secant bulk modulus of the PFPE fluids were calculated by using the test results. Relationships of these moduli with pressure and temperature were examined. High pressure viscosity of each PFPE fluid was measured and the pressure viscosity coefficients of the PFPE fluids were obtained. In addition, the maximum traction coefficient and the limiting shear stress of each fluid were evaluated from the traction test employing a ball-on-disk testing machine. As a result, it was found that the maximum traction coefficient and the limiting shear stress are closely related to the tangent bulk modulus and the secant bulk modulus, respectively. The significant relationship of the maximum traction coefficient with the molecular packing parameter represented by the product of the pressure viscosity coefficient and the mean Hertzian pressure was also confirmed.

English abstract

Using three kinds of commercial perfluoropolyether (PFPE) fluids, the authors carried out high pressure density test at the pressure up to 1.2 GPa. Tangent bulk modulus and secant bulk modulus of the PFPE fluids were calculated by using the test results. Relationships of these moduli with pressure and temperature were examined. High pressure viscosity of each PFPE fluid was measured and the pressure viscosity coefficients of the PFPE fluids were obtained. In addition, the maximum traction coefficient and the limiting shear stress of each fluid were evaluated from the traction test employing a ball-on-disk testing machine. As a result, it was found that the maximum traction coefficient and the limiting shear stress are closely related to the tangent bulk modulus and the secant bulk modulus, respectively. The significant relationship of the maximum traction coefficient with the molecular packing parameter represented by the product of the pressure viscosity coefficient and the mean Hertzian pressure was also confirmed.

Keywords

point contact numerical solution, phase diagram

Key words in English

point contact numerical solution, phase diagram

Authors

KANETA, M.; ŠPERKA, P.; KŘUPKA, I.; HARTL, M.

RIV year

2017

Released

09.05.2014

Publisher

Helsinky University of Technology

Location

Helsinky

ISBN

0780-2285

Periodical

Tribologia: Finnish Journal of Tribology

Volume

32

Number

2

State

Republic of Finland

Pages from

29

Pages to

37

Pages count

9

BibTex

@article{BUT123924,
  author="Motohiro {Kaneta} and Petr {Šperka} and Ivan {Křupka} and Martin {Hartl}",
  title="Ehl traction analysis of perfluoropolyether fluids based on bulk modulus",
  journal="Tribologia: Finnish Journal of Tribology",
  year="2014",
  volume="32",
  number="2",
  pages="29--37",
  issn="0780-2285"
}