Abstract
Magnetorheological suspensions (MRS) behave like a Bingham fluid having yield stress which can be rapidly changed in a reversible manner by applying magnetic field, and are anticipated some applications of industrial devices such as damper, a valve, a clutch, a brake, and so on. In these applications, one of serious problems is the sedimentation of dispersed particles in the MR suspension in an off-working state. In this research, for the purpose of preventing the particles from settling, an MR composite made of the sponge containing the MR suspension has been developed and the dynamic nonlinear viscoelastic properties of the MR composite in oscillatory shear mode under magnetic flux normal to the shear direction have been investigated by using a newly developed oscillatory shear type rheometer.
