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MAE438-538 notes smart mater

MAE438-538 notes smart mater - University at Buffalo...

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University at Buffalo Department of Mechanical and Aerospace Engineering MAE 438/538 Prof. D.D.L. Chung Smart Materials Magnetorheology Magnetorheology refers to the phenomenon in which the rheological behavior changes upon application of a magnetic field. A magnetorheological fluid (abbreviated MR fluid) is a non-colloidal dispersion of fine magnetic (ferromagnetic or ferrimagnetic) particles in a liquid medium. The most common particles are iron, which is ferromagnetic. It exhibits shear thinning. Upon application of a magnetic field, the magnetic dipole moments of different particles align, resulting in columns of particles in the direction of the magnetic field (Fig. 1). Thus, the viscosity of the fluid increases with increasing magnetic field at any shear rate. Due to the remanent magnetization upon removal of the magnetic field, magnetorheology is not as reversible as electrorheology. Furthermore, the speed of response is lower for MR fluids than ER fluids. However, MR fluids are free from conduction and dielectric breakdown phenomena, from which ER fluids suffer.
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