Abstract
Abstract The shear stresses of ER (Electro-rheological) suspensions are measured by changing a shear rate, amplitude and frequency of electric fields using rotational viscometer whose gap between electrodes can be changed. We use two ER suspensions which are called ERFC and ERFP. ERFC consist of cellulose suspended in silicone oil. The size of cellulose particles is typically about 10∼20 μm and a viscosity of silicone oil is 10mm2/s. Cellulose concentration is 20wt.% and the percentage of moisture content is 0.6%. ERFP contains highly sulfonated poly (styrene-co-divinylbenzene) particles. An average particle diameter of ERFP is 9 microns and the water content is 2.0 wt.%. Unipolar sine-wave electric fields which is AC with DC bias and bipolar sine-wave electric fields without DC bias are used. The shear rates of 400 s−1 are employed. Amplitudes of the electric fields are 0.4 and 0.8 kV/mm and DC component is 1.0 kV/mm for unipolar sine-wave electric fields. Amplitudes are between 1.0 and 2.5 kV/mm for bipolar sine-wave electric fields. The frequency of the electric fields is changed from 0.1 to 100 Hz. Dependence of the shear stress on electrical excitation frequency is investigared.
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