Detail publikačního výsledku

Ehl traction analysis of perfluoropolyether fluids based on bulk modulus

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

Originální název

Ehl traction analysis of perfluoropolyether fluids based on bulk modulus

Anglický název

Ehl traction analysis of perfluoropolyether fluids based on bulk modulus

Druh

Článek recenzovaný mimo WoS a Scopus

Originální abstrakt

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.

Anglický abstrakt

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.

Klíčová slova

point contact numerical solution, phase diagram

Klíčová slova v angličtině

point contact numerical solution, phase diagram

Autoři

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

Rok RIV

2017

Vydáno

09.05.2014

Nakladatel

Helsinky University of Technology

Místo

Helsinky

ISSN

0780-2285

Periodikum

Tribologia: Finnish Journal of Tribology

Svazek

32

Číslo

2

Stát

Finská republika

Strany od

29

Strany do

37

Strany počet

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"
}