Volume 9, Issue 1 (January 2012)
Magnetic Particles Effects on Shear Performance in MR Fluid
Magneto-rheological (MR) fluids, as smart fluids, are suspensions of micron-sized magnetic particles, such as iron particles or cobalt, in a silicone or hydraulic oil carrier fluid, which can change from the liquid state to a semi-solid state in several milliseconds in the external magnetic field. In this paper, the produced chain, which will give rise to the MR effect, is investigated by the magnetic force between two particles, the relationship between the produced shear torque, and magnetic particles are proposed. A set of testing systems, including the plate-on-plate MR fluid shearing test rig, is built to study the percentage of magnetic particles in MR fluid. The magnetic field in the gap, before and after the gap is added with MR fluid, is investigated by measuring and calculating. The results validate the effect of the content of magnetic particles in MR fluid on the shear performance.