Magnetorheology in viscoplastic media |
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Authors: | Peter J Rankin Andrew T Horvath Daniel J Klingenberg |
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Institution: | (1) Department of Chemical Engineering and Rheology Research Center University of Wisconsin Madison, WI 53706, USA, US |
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Abstract: | Suspensions of iron particles in media with yield stresses were investigated to determine the effect of the continuous phase
yield stress on the magnetorheological (MR) response. The steady-shear MR response was independent of the continuous phase
yield stress for yield stresses in the range 0.9–37 Pa. The field-induced suspension yield stress increased sub-quadratically
with the flux density. The small amplitude oscillatory shear response exhibited history dependence. The storage modulus depended
not only on the magnitude of the applied magnetic field, but also on its history. This history dependence can be explained
in terms of the field-dependent evolution of the suspension microstructure.
Received: 24 February 1999 Accepted: 12 July 1999 |
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Keywords: | Magnetorheology Viscoplastics Yield stress Grease Sedimentation |
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