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Proceedings Paper

Comparative analysis of Bingham characteristics of ER/MR fluids with different viscometers
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Paper Abstract

This paper theoretically presents Bingham characteristics of ER (electrorheological)/MR (magnetorheological) fluids with respect to different rotational viscometers through comparative analysis. For doing so, two different types of rotational viscometers are introduced and configured for ER/MR fluids; one is a rotational coaxial cylinder viscometer and the other is a rotational parallel disk viscometer. In order to determine the shear stress and shear rate of fluids tested in both viscometers, the fundamental equations between shear stress and torque as well as shear rate and angular velocity are derived on the basis of the biviscous constitutive model. The biviscous model is characterized by a yield stress: when the shear stress is less than this yield stress, the preyield viscosity is relatively large compared to the postyield viscosity when shear stress is greater than the yield stress. For rotational coaxial cylinder viscometers, the shear stress can be calculated directly from the measured torque. However, for the determination of the shear rate, some strategies are required. In this study, different methods of determining the shear rate are developed and their accuracy is assessed. In the case of rotational parallel disk viscometers, the calculation of the shear rate is straightforward from angular velocity measurements, but the shear stress requires a relatively complicated calculation. In this study, for simplicity, the shear stress is approximated and the error of this approximation is evaluated with respect to important rotational parallel disk viscometer geometry. Finally, the Bingham characteristics of ER/MR fluids at two different rotational viscometers are theoretically presented and compared in the shear stress vs. shear rate response.

Paper Details

Date Published: 27 June 2002
PDF: 10 pages
Proc. SPIE 4697, Smart Structures and Materials 2002: Damping and Isolation, (27 June 2002); doi: 10.1117/12.472651
Show Author Affiliations
Young-Tai Choi, Univ. of Maryland/College Park (United States)
Norman M. Wereley, Univ. of Maryland/College Park (United States)

Published in SPIE Proceedings Vol. 4697:
Smart Structures and Materials 2002: Damping and Isolation
Gregory S. Agnes, Editor(s)

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