Study of magnetorheological fluids at high shear rates (original) (raw)

The tunable rheological properties of magnetorheological (MR) materials at high shear rates are studied using a piston-driven flowmode-type rheometer. The proposed method provides measurement of the apparent viscosity and yield stress of MR fluids for a shear rate range of 50 to 40,000 s −1 . The rheological properties of a commercial MR fluid, as well as a newly developed MR polymeric gel, and a ferrofluid-based MR fluid are investigated. The results for apparent viscosity and dynamic and static shear stresses under different applied magnetic fields are reported.