Magnetorheological Fluid Behavior Under Constant Shear Rates and High Magnetic Fields Over Long Time Periods

[+] Author and Article Information
Constantin Ciocanel

 The University of Toledo, College of Engineering, 2801 W. Bancroft, Toledo, Ohio 43606cciocane@eng.utoledo.edu

Kevin Molyet, Hideki Yamamoto, Sheila L. Vieira, Nagi G. Naganathan

 The University of Toledo, College of Engineering, 2801 W. Bancroft, Toledo, Ohio 43606

J. Eng. Mater. Technol 128(2), 163-168 (Aug 29, 2005) (6 pages) doi:10.1115/1.2172276 History: Received March 21, 2005; Revised August 29, 2005

This paper presents a new magnetorheological (MR) cell design along with a study of the magnetic field, shear rate, and time/shear strain influences on the properties and behavior of a MR fluid tested for long periods of time. The MR cell was designed to adapt a commercially available rheometer to measure the rheological properties of the fluid. Overall characteristics of the designed MR cell output capability are provided. Constant shear rate tests, two hours in duration, have been performed at shear rates between 0.1ls and 200ls under magnetic field intensities up to 0.4T. The rheological measurements indicated that over time the fluid’s shear stress magnitude decreases until it reaches a steady state. The time required to reach the steady state depends on both the magnetic field strength and the shear rate. The higher the field and the smaller the shear rate the shorter the time for the steady state to be reached.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Lamellar formations of ER/MR particles formed under electric/magnetic field and shear proposed by Henley and Filisko (3)

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Figure 2

Custom-designed rheometric cell

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Figure 3

Magnetic field variation within the MR fluid, measured along the radius from the center of the plate

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Figure 4

Magnetic field at the center of the MR cell versus the current passing through the coil

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Figure 5

Magnetic field distribution inside the MR fluid for i=2.3A

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Figure 6

Hysteresis curves of shear stress as a function of shear rate at 0.4T magnetic field

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Figure 7

(a) Shear stress as a function of time in the absence of a magnetic field; (b) Region 0–600s expanded

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Figure 8

Shear stress versus time for various shear rates

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Figure 9

Shear stress versus shear strain at various shear rates

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Figure 10

First normal stress difference versus time

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Figure 11

The MR fluid’s appearance at the end of the test



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