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The dynamic nonlinear viscoelasticity of an MR fluid in oscillatory pressure flow under magnetic flux normal to the flow direction has been investigated by using a newly developed oscillatory pressure flow type rheometer. The MR fluid consisting of micron-sized magnetically polarizable particles (carbonyl iron) dispersed into a carrier medium (hydrocarbon oil) was evaluated. The dependence of viscoelasticity of the MR fluid on magnetic field strengths, fluid strain amplitudes and fluid oscillation frequencies have been already investigated. Generalized viscoelastic mechanical models of the MR fluid in oscillatory slit flow are very important for analyzing various MR dampers using MR valves. In this work, a nonlinear dynamic viscoelastic mechanical model of the MR fluid in oscillatory slit flow is proposed, based on the data which have been already measured. The proposed viscoelastic mechanical model of an MR fluid is discussed and compared with the experimental results.

Rheological Properties and Dynamic Mechanical Model of a Magnetorheological Suspension in Pressure Flow Mode.