Abstract
Working modes of shear deformation and pressure flow typically appear in devices using Magnetorheological (MR) fluids. In this paper, rheometers, which can apply shear deformation and pressure flow respectively, have been developed. As typical characteristics of MR fluids, shear stress and pressure difference have been measured on changing flow rate, magnetic flux density, types of MR fluids, and gap length through which MR fluids flow in MR devices. Considering the magnetic circuit in these rheometers, relationship between magnetic flux density and magnetic field strength of an MR fluid has been shown. Using these results, designing method of MR devices has been shown.
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