Magnetic response properties of natural-rubber-based magnetorhelogical elastomers with different-structured iron fillers

摘要

This study investigates the response properties of natural-rubber-based magnetorheological elastomer (MRE) containing two different types of iron powder with different weight content. MREs with different anisotropy were prepared through solution blending and applying a magnetic field during vulcanization. Carbonyl iron particles (S-1640) with round shape and smaller size have greater effect on mechanical stiffening than bigger and irregularly structured electrolytic iron powder (Fe#400) in the MREs with the same weight fraction. The highest anisotropies belong to 1.0 T for S-1640 and 1.5 T for Fe#400 filled MREs. Hence, a lower magnetic field is sufficient to obtain higher magnetic effect in MREs filled with S-1640 iron powder. An external magnetic field has a strong effect on the stress-softening of MREs. S-1640 iron powder has a higher magnetic effect with a lower stress-relaxation rate than Fe#400 iron powder in the MREs.