Publication detail
Changing the behavior of MR fluids during long term operation
ROUPEC, J. MAZŮREK, I. STRECKER, Z.
Czech title
Změna chování MR kapalin během dlouhodobého provozu
English title
Changing the behavior of MR fluids during long term operation
Type
conference paper
Language
en
Original abstract
The article describes results of durability test of a magnetorheological fluid (MRF) which was carried out in a custom design rheometer. The rheometer design allows measurement of the rheological properties of MR fluid and its exposure to a long-term loading simultaneously, without any manipulation of the measured sample. Owing to this, changes of the two most important parameters describing the behavior of MR fluids – dynamic viscosity and yield stress – could be followed during the durability test. The dependence of yield stress and dynamic viscosity on temperature and magnetization current was evaluated. The results show a significant change of the yield strength (500%) during the durability test. Independence of the yield stress on the temperature was conclusively proven. The viscosity decreased by 35% from its initial value after dissipation of 9000kJ out of total 119000kJ and then remained the same until the end of the durability test. Viscosity dependence on temperature was evaluated.
Czech abstract
V článku jsou popsány výsledky trvanlivostního testu magnetoreologické kapaliny (MRF), který byl proveden na reometru vlastní konstrukce. Konstrukce reometru umožňuje zároveň měřit reologické vlastnosti MR kapaliny a zároveň ji podrobovat dlouhodobému zatěžování, aniž by došlo k manipulaci s měřeným vzorkem. V průběhu životnostního testu tak bylo možné sledovat změnu dvou nejdůležitějších parametrů popisujících chování MR kapaliny – meze kluzu a viskozity. Mez kluzu i viskozita byly vyhodnoceny v závislosti na teplotě a magnetizačním proudu. Výsledky ukazují na výraznou změnu meze kluzu (500%) v průběhu životnostního testu. Závislost meze kluzu na teplotě nebyla prokázána. Viskozita poklesla o 35% ze své počáteční hodnoty po disipaci 9 000kJ z celkových 119 000kJ a poté již zůstala stejná až do konce životnostního testu. Viskozita byla vyhodnocována v závislosti na teplotě.
English abstract
The article describes results of durability test of a magnetorheological fluid (MRF) which was carried out in a custom design rheometer. The rheometer design allows measurement of the rheological properties of MR fluid and its exposure to a long-term loading simultaneously, without any manipulation of the measured sample. Owing to this, changes of the two most important parameters describing the behavior of MR fluids – dynamic viscosity and yield stress – could be followed during the durability test. The dependence of yield stress and dynamic viscosity on temperature and magnetization current was evaluated. The results show a significant change of the yield strength (500%) during the durability test. Independence of the yield stress on the temperature was conclusively proven. The viscosity decreased by 35% from its initial value after dissipation of 9000kJ out of total 119000kJ and then remained the same until the end of the durability test. Viscosity dependence on temperature was evaluated.
Keywords in Czech
magnetoreologická kapalina, MRF, trvanlivostní test, mez kluzu, dynamická viskozita, smykový spád
Keywords in English
Magnetorheological fluid, MRF, durability test, yield stress, dynamic viscosity, shear rate
RIV year
2011
Released
09.05.2011
Publisher
IT ASCR
Location
Brno
ISBN
978-80-87012-33-8
Book
Engineering Mechanics 2011
Edition number
1
Pages from–to
519–522
Pages count
4
BIBTEX
@inproceedings{BUT72626,
author="Jakub {Roupec} and Ivan {Mazůrek} and Zbyněk {Strecker},
title="Changing the behavior of MR fluids during long term operation",
booktitle="Engineering Mechanics 2011",
year="2011",
month="May",
pages="519--522",
publisher="IT ASCR",
address="Brno",
isbn="978-80-87012-33-8"
}