Publication detail
Mechanical Degradation of the Liquid in an Operating EHL Contact
KŘUPKA, I. HARTL, M. BAIR, S. SVOBODA, P. KUMAR, P.
Czech title
Mechanická degradace maziva v elastohydrodynamickém kontaktu
English title
Mechanical Degradation of the Liquid in an Operating EHL Contact
Type
journal article - other
Language
en
Original abstract
Elastohydrodynamic lubrication (EHL) calculations using the real pressure and real shear dependence of viscosity have revealed that the shear and load dependences of film thickness are often greater than the classical prediction. Experimental measurements have confirmed the increased sensitivity to scale and load; however, the sensitivities are even greater than would be expected from shear-thinning. Time-dependent film thickness measurements and stress-history-dependent flow curves are employed to show that molecular degradation may occur at nominal rolling EHL stress levels and that this degradation affects the film thickness.
Czech abstract
Článek shrnuje výsledky experimentálního ověření vlivu mechanické degradace maziva na tloušťku elastohydrodynamického mazacího filmu při použití newtonských i nenewtonských maziv. V důsledku opakovaného průchodu maziva kontaktem dochází k redukci tloušťky mazacího filmu. Jako jedna z možných příčin je diskutována molekulární degradace maziva.
English abstract
Elastohydrodynamic lubrication (EHL) calculations using the real pressure and real shear dependence of viscosity have revealed that the shear and load dependences of film thickness are often greater than the classical prediction. Experimental measurements have confirmed the increased sensitivity to scale and load; however, the sensitivities are even greater than would be expected from shear-thinning. Time-dependent film thickness measurements and stress-history-dependent flow curves are employed to show that molecular degradation may occur at nominal rolling EHL stress levels and that this degradation affects the film thickness.
Keywords in Czech
Elastohydrodynamické mazání; Tloušťka filmu; Reologie; Nenewtonské chování
Keywords in English
EHL with non Newtonian lubricants; Rheology; Non Newtonian behavior; Lubricant degradation
RIV year
2010
Released
05.10.2010
Publisher
Springer
Location
EU
ISSN
1023-8883
Journal
Tribology Letters
Volume
40
Number
3
Pages from–to
1–7
Pages count
7
BIBTEX
@article{BUT49899,
author="Ivan {Křupka} and Martin {Hartl} and Petr {Svoboda},
title="Mechanical Degradation of the Liquid in an Operating EHL Contact",
journal="Tribology Letters",
year="2010",
volume="40",
number="3",
month="October",
pages="1--7",
publisher="Springer",
address="EU",
issn="1023-8883"
}