Fig. 3 shows the shear viscosity with seven samples with dif- ferent powder volume fraction. The base fluid with ox of metal particle had Newtonian fluid-like behavior with no significant viscosity changes under different shear rates. However, once metal particles were added to the base fluid, it had non-Newtonian fluid- like behavior. For samples with 10%, 20a, 30% 40, 50a, and 60x, the shear thinning behaviors have been observed. As the particle volume fraction increased, the shear viscosity also increased in the order of magnitude. The presence of particles disturb the shear flow of MR fluid, thus increasing the shear viscosity. Therefore, more volume of particles in the based fluid led to higher shear viscosity