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| Simulation on physical parameters of magneto-rheological elastomers |
| Revised:October 08, 2005 |
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| DOI：10.7511/jslx20075111 |
| KeyWord:magneto-rheological elastomers,magnetic permeability,shear modulus,finite element method |
| ZHU Ying-shun GONG Xing-long ZHANG Pei-qiang |
| CAS Department of Mechanics and Mechanical Engineering,University of Science and Technology of China,Key Laboratory of Mechanical Behavior and Design of Materials,Hefei 230027,China |
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| Abstract: |
| By means of finite element method where the nonlinearity and saturation of the particle magnetization were incorporated,the distribution of magnetic field inside MR(Magneto-Rheological) elastomers was obtained when they were exposed to an external magnetic field.Then the relative magnetic permeabilities of the MR elastomers in the direction of the chain-like structures were also calculated for various magnetic fields and particle volume fractions.The results are in agreement with that of experiments.Using Maxwell stress tensor,a model was proposed to calculate the increase in the shear modulus due to the magnetic field for the MR elastomers.The influences of the particle concentration and applied magnetic field on the increments in the shear modulus due to the magnetic field were analyzed.When the particles were rotary ellipsoid,the influences of the way how the particles were arranged and the ratio of the long axis to the short axis on the magnetic-induced shear modulus were studied.Results show that,the relative magnetic permeability of the MR elastomers increases with the particle concentration,but decreases when the magnetic field increases.The shape and arrangement of the particles have significant influence on the magneto-rheological effect. |
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