Abstract:
Inspired and benefited by its controllable and field-dependent stiffness/damping properties,
there has been an increasing research and development on magnetorheological elastomer
(MRE) for mitigation of unwanted structural or machinery vibrations using MRE isolators or
absorbers. The main aim of this research work was to determine the behaviour of MRE using
Nickel and Cobalt and to compare the magnetorheological effect between them. Most of the
research work have been done on MREs using carbonyl iron as filler material, so this study
aimed at observing any change in characteristics of MREs using Nickel and Cobalt as filler
particles. The use of nickel and cobalt has been increasing in magnetic appliances in every field
and their magnetic properties at micro level are almost similar to carbonyl iron. So, the CI
particles were replaced with Ni and Co particles. The research work methodology comprised
of characterization of metallic powders to determine size of particles and check for impurities,
then casting was done following it was the micro-image analysis of casted MREs and then the
dynamic shear testing on the casted samples and finally the analysis of obtained results. The
outcome of this research work was that for Nickel and Cobalt higher MR effect was observed
at lower filler percentages and also higher MR effect was observed for Nickel based MREs
than for Cobalt based MREs.
