|Sample||Carbonyl iron powder||Oil (carrier fluid)||weight ratio of iron powder to oil|
|weight (gr)||Particle size (m)||weight (gr)||Viscosity (cSt)||Viscosity (Pa-s)|
Table 1: Hand made MRF ingredients
(a) MTS machine
(b) Linear sponge damper
Figure 1: Linear sponge damper used for testing the MR fluid samples. The linear sponge based damper uses a polyurethane sponge saturated with MR fluid to eliminate the sealing problem. A copper coil of gauge 28 with 400 coil turns, creating 10 ohms of resistance, is used that can carry a maximum current of 2 amps. The resulting force-velocity graphs of the damper for varieties of MR fluids are used to determine the most practical MR fluid with the greatest range (in terms of force) in on-state and low viscosity in off-state. The MTS machine results of this MRF sample is presented in Figure 2.