Publication detail
The role of the glass transition for EHL minimum film thickness
HABCHI, W. ŠPERKA, P. BAIR, S.
English title
The role of the glass transition for EHL minimum film thickness
Type
journal article in Web of Science
Language
en
Original abstract
When the glass transition is considered in an EHL traction analysis, shear-thinning is not sufficient to explain experiments because there is no liquid behavior to shear-thin and a limiting stress is required. The usual approach of ignoring the glass transition and the associated previtreous pressure dependence has concealed the role of vitrification in establishing the minimum film thickness in real contacts. For the first time, the glass transition is considered in an elastohydrodynamic lubrication simulation along with the glass compressibility. Vitrification and the previtreous pressure response are necessary to predict the minimum film thickness in a point contact. Future numerical simulations should include the glass transition, both for the film thickness and, of course, friction.
English abstract
When the glass transition is considered in an EHL traction analysis, shear-thinning is not sufficient to explain experiments because there is no liquid behavior to shear-thin and a limiting stress is required. The usual approach of ignoring the glass transition and the associated previtreous pressure dependence has concealed the role of vitrification in establishing the minimum film thickness in real contacts. For the first time, the glass transition is considered in an elastohydrodynamic lubrication simulation along with the glass compressibility. Vitrification and the previtreous pressure response are necessary to predict the minimum film thickness in a point contact. Future numerical simulations should include the glass transition, both for the film thickness and, of course, friction.
Keywords in English
EHL;Film thickness;Glass transition;Pressure-viscosity
Released
01.12.2023
Publisher
Elsevier
Location
OXFORD, ENGLAND
ISSN
0301-679X
Volume
190
Number
12
Pages count
8
BIBTEX
@article{BUT187578,
author="Wassim {Habchi} and Petr {Šperka} and Scott {Bair},
title="The role of the glass transition for EHL minimum film thickness",
year="2023",
volume="190",
number="12",
month="December",
publisher="Elsevier",
address="OXFORD, ENGLAND",
issn="0301-679X"
}