Abstract
Magneto rheological elastomer (MRE) is a new kind of smart materials. Its dynamic mechanical performances can be controlled by controlling an applied magnetic field. MRE is usually used as stiffness - changeable spring in the semi-active vibration absorber. In order to get perfect vibration control effect, low dynamic damping of MRE is needed. This paper presents a new method of fabricating isotropic MREs under normal temperature and pressure conditions. In the absence of a magnetic field, a variety of MR elastomer samples were prepared using Sylard’s184 silicone elastomer along with un-annealed electrolytic iron power 500 mesh and 15 micron size. Their dynamic characteristics like fractional change in resonant frequency and fractional change in have been studied. The effects of iron particles and the applied magnetic field were investigated. This study is also expected to provide a good guide for designing and preparing new MR elastomers.
Highlights
Magnetorheological (MR) materials including MR fluids, MR elastomer and MR foams [1] are important branches of smart materials
The moulds were cured in the absence of any magnetic field; the prepared Magneto rheological elastomer (MRE) moulds have been called as Isotropic MRE
The result shown in graph (Fig.5) clearly shows that the fractional change in shear modulus has been increased by 0.187% to 0.19% under different loads which indicates improvement in properties of MRE
Summary
Magnetorheological (MR) materials including MR fluids, MR elastomer and MR foams [1] are important branches of smart materials. MRE have good MR effects with , the mechanical properties can be controlled by a magnetic field. They have good mechanical performance for using rubber as matrix. Vibration absorber is kind of machine used for vibration control. It has a vibration system inside, including spring and vibration mass. In order to get perfect vibration control effect, the energy transfer ratio between the energy transferred and the total energy is good. The low dynamic damping of spring is need to get good energy transfer ratio. In order to get perfect vibration control effect, the dynamic damping of MRE should be controlled to lower value
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