said magnetorheological fluid with a yield stress and the shear rate

摘要

The present invention relates to a magnetorheological fluid having a high yield stress at high shear rates. ; Magnetorheological fluid will look different properties depending on the type or size and particle size distribution of the particles, in this case magnetorheological fluid has not been applied to the magnetic field In order to have the ideal characteristic (Off-state) has the lowest possible viscosity properties and low yield stress If, on the other hand having a magnetic field is applied (on-state) in should have a high yield stress (yield stress). ; Therefore, in the present invention, the ① 1㎛≤d10 3㎛, ② 3㎛≤d50 6㎛, ③ 6㎛≤d90 12㎛, ④ (d90-d10) / d50≥2 to satisfy the conditions such as the It offers a magnetorheological fluid having a particle size distribution. ; Magnetic rheological fluid of the present invention is expected to contribute greatly to the stability and improve the reliability for the mechanical device, such as clutch, brake, engine mounts, including an enlarged, the damper control range. ; Magnetorheological fluid, MR fluid, the yield stress, shear force, the turn eopbi (TUR), Span (SPAN), a particle size distribution