6533b7d9fe1ef96bd126c0f5
RESEARCH PRODUCT
Yield behavior of magnetorheological suspensions
S. LacisOlga S. VolkovaGeorges BossisP. Khuzirsubject
Yield (engineering)Materials scienceCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsMagnetic fieldSuspension (chemistry)MicrometreCarbonyl ironNuclear magnetic resonanceRheologyMagnetorheological fluidMagnetic nanoparticlesComposite materialhuman activitiesdescription
The rheology of suspensions containing magnetic particles of micrometer size is strongly modified by the application of a magnetic field. We first describe a model experiment where the suspension is made of spheres of millimeter size and we show that the experimental dependence of the yield stress is well predicted by a non-affine model where the chains of particles break in the middle. Then we compare these predictions with some experimental results obtained on suspensions of carbonyl iron; it is shown that this model does not apply in this case. We propose a mechanism where after some friction on the walls the aggregates begin to rotate and break at a strain smaller than unity, due to the interactions with other aggregates.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-03-01 | Journal of Magnetism and Magnetic Materials |