The Influences on Field-induced Chains by non-magnetic Microstructures inside the Magnetorheological Fluids Based on PTFE-oil Organogel

The Influences on Field-induced Chains by non-magnetic Microstructures inside the Magnetorheological Fluids Based on PTFE-oil Organogel

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Polytetrafluoroethylene (PTFE) micropowders were used to prepare PTFE-oil organogel.Carbonyl iron particles were dispersed in this organogel to fabricate magnetorheological fluids.The main aim of this paper is to Sundae Spoon investigate the influences on field-induced chains by non-magnetic microstructures inside these organogel-based MRFs.The field-induced anisotropy of MRFs between first normal stress differences to shear stresses and dynamic modulus reveal that organogel widen the non-Newtonian elastic range of MRFs as long as the non-magnetic particles content is appropriate.Both theoretical and experimental results of static and dynamic normal forces indicate that normal forces are influenced by magnetic and non-magnetic microstructures comprehensively.

The dynamic normal forces are lower than static ones under low magnetic field strength while the phenomenon becomes opposite in the presence of high strength magnetic field.Moreover, a 3ITT test of normal forces exhibits a significant time-dependent behavior of the normal forces.The investigations of recovery ratio demonstrate that the non-magnetic microstructures help field-induced chains to recover at relatively low magnetic field strength but hinder this structural recovery at high magnetic field strength.Finally, a new investigation method on amplitude-dependent normal forces is introduced showing a four-region behavior as a function of strain amplitude, Dryer Hinge Cover which reflects the internal microscopic evolution of MRFs and could be a proper way to study the influences on field-induced chains by non-magnetic particles.