Magnetorheology of a Carbonyliron Microsphere Suspension
with a Halloysite Additive and Its Damping Force Characteristics
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Abstract
A carbonyliron (CI)-based magnetorheological
(MR) suspension was
prepared with halloysite nanoclay particles as an additive. The MR
properties of the suspension were investigated using a rotational
rheometer with a parallel-plate geometry equipped with a magnetic
field supply under a range of external magnetic field strengths. From
the sedimentation ratio test to assess the dispersion stability, the
addition of halloysite particles to the CI suspension was found to
improve the sedimentation problem. MR fluids containing both pure
CI and CI/halloysite were employed in a custom-designed MR damper,
and their damping characteristics, such as the damping force as a
function of time, displacement, and velocity, were examined experimentally
because the vibration attenuation using mechanical damper systems
is one of the main applications of MR fluids. Under the same magnetic
field strength, the damping characteristics of the two MR fluids were
found to be related directly to their yield stresses