The frequency dependence of the shear stress of metal‐particle/insulating oil electrorheological (ER) fluids under an ac electric field has been studied. The results show that the shear stress of the metal‐particle ER fluid under a fixed electric field increases with increasing frequency and then tends to a saturated value at higher frequency. The shear stress at 103 Hz is much larger than that under a dc field. The transition of the shear stress shifts to higher frequency when the conductivity of the fluid is larger. The measurements are consistent with the theoretical model proposed by Davis [J. Appl. Phys. 73, 680 (1993)].
Topics
Electrodynamics
REFERENCES
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A. Inoue, in Proceedings of The International Conference on Electrorheological Fluids: Mechanism, Properties, Structure, Technology, and Applications, edited by R. Tao (World Scientific, Singapore, 1992), p. 116.
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The microscopic pattern of the aluminum particle chains under 1400 V/mm field, f=50 Hz. The gap of the electrodes is 0.5 mm.
The shear stress vs frequency at 900 V/mm. Curve (1) and (2) are measured, (φ=0.3). Curve (3) is vs f calculated and copied from Ref. 11 for S/m.
The shear stress vs field strength at f=1000 Hz.
The temperature dependence of the shear stress measured at 1000 V/mm and 1000 Hz (φ=0.3).
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© 1995 American Institute of Physics.
1995
American Institute of Physics
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