Publication detail
EFFECT OF PROTEINS ON FILM FORMATION IN BOVINE SERUM LUBRICATED CONTACTS UNDER ROLLING/SLIDING CONDITIONS
VRBKA, M. NÁVRAT, T. KŘUPKA, I. HARTL, M. GALLO, J.
Czech title
Vliv proteinů na formování mazacího filmu v kontaktech mazaných hovězím sérem za podmínek valení a skluzu
English title
EFFECT OF PROTEINS ON FILM FORMATION IN BOVINE SERUM LUBRICATED CONTACTS UNDER ROLLING/SLIDING CONDITIONS
Type
conference paper
Language
en
Original abstract
The aim of this study is to perform detail experimental mapping of the lubricating film thickness of bovine serum (BS) within the contact between an artificial metal or ceramic femoral head and a glass disc and analyze effect of proteins on the film formation under rolling/sliding conditions. The film thickness was studied experimentally using an optical test rig as a function of time under variety of constant mean speeds. Chromatic interferograms were recorded with a high-speed digital camera and evaluated with thin film colorimetric interferometry. Under pure rolling conditions it was observed that the central film thicknesses increased with time for all measurements. When the disc was slower than head then the measured central film thicknesses achieved values only about some few nanometres, whereas when the tests were realized with faster disc then measured central film thicknesses achieved significantly higher values. Distribution of the film thickness within the contact zone is not homogeneous and two different film thickness regions can be found; thicker protein film and thinner base film that both show specific behaviour over time. This study showed that protein formation plays an important role in the lubrication processes of artificial joints of the human. Due to challenging of this study the more complex research work is carried out at the present time.
Czech abstract
Uvedený článek se zabývá experimentálním studiem vlivu proteinů obsažených v hovězím séru na formování mazacího filmu v elastohydrodynamických kontaktech za podmínek valení a skluzu.
English abstract
The aim of this study is to perform detail experimental mapping of the lubricating film thickness of bovine serum (BS) within the contact between an artificial metal or ceramic femoral head and a glass disc and analyze effect of proteins on the film formation under rolling/sliding conditions. The film thickness was studied experimentally using an optical test rig as a function of time under variety of constant mean speeds. Chromatic interferograms were recorded with a high-speed digital camera and evaluated with thin film colorimetric interferometry. Under pure rolling conditions it was observed that the central film thicknesses increased with time for all measurements. When the disc was slower than head then the measured central film thicknesses achieved values only about some few nanometres, whereas when the tests were realized with faster disc then measured central film thicknesses achieved significantly higher values. Distribution of the film thickness within the contact zone is not homogeneous and two different film thickness regions can be found; thicker protein film and thinner base film that both show specific behaviour over time. This study showed that protein formation plays an important role in the lubrication processes of artificial joints of the human. Due to challenging of this study the more complex research work is carried out at the present time.
Keywords in Czech
biotribologie, hovězí sérum, tloušťka filmu, protein
Keywords in English
biotribology, bovine serum, film thickness, protein
RIV year
2012
Released
08.10.2012
Publisher
ASME
Location
Denver, Colorado, USA
ISBN
978-0-7918-4508-0
Book
ASME/STLE 2012 Joint Tribology Conference (IJTC2012)
Edition number
1
Pages from–to
1–3
Pages count
3
BIBTEX
@inproceedings{BUT99016,
author="Martin {Vrbka} and Tomáš {Návrat} and Ivan {Křupka} and Martin {Hartl} and Jiří {Gallo},
title="EFFECT OF PROTEINS ON FILM FORMATION IN BOVINE SERUM LUBRICATED CONTACTS UNDER ROLLING/SLIDING CONDITIONS",
booktitle="ASME/STLE 2012 Joint Tribology Conference (IJTC2012)",
year="2012",
month="October",
pages="1--3",
publisher="ASME",
address="Denver, Colorado, USA",
isbn="978-0-7918-4508-0"
}