Investigation on magnetorheological elastomers based on natural rubber |
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Authors: | Lin Chen Xing-long Gong Wan-quan Jiang Jing-jing Yao Hua-xia Deng Wei-hua Li |
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Affiliation: | (1) CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Mechanics and Mechanical Engineering, University of Science and Technology of China (USTC), Hefei, 230027, China;(2) Department of Chemistry, USTC, Hefei, 230026, China;(3) School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia |
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Abstract: | Magnetorheological Elastomers (MR Elastomers or MREs) are a kind of novel smart material, whose mechanical, electrical, magnetic
properties are controllable under applied magnetic fields. They have attracted increasing attentions and broad application
prospects. But conventional MREs are limited to wide applications because their MR effects and mechanical performances are
not high enough. This paper aims to optimize the fabrication method and to fabricate good natural rubber based MREs with high
modulus by investigating the influences of a variety of fabrication conditions on the MREs performances, such as matrix type,
external magnetic flux density, and temperature, plasticizer and iron particles. Among these factors, the content of iron
particles plays a most important contribution in shear modulus. When the iron particle weight fraction is 80% and the external
magnetic flux density is 1 T, the field-induced increment of shear modulus reaches 3.6 MPa, and the relative MR effect is
133%. If the iron weight fraction increases to 90%, the field-induced increment of shear modulus is 4.5 MPa. This result has
exceeded the best report in the literatures researching the MREs on the same kind of matrix. The dynamic performances of MREs
were also experimentally characterized by using a modified Dynamic Mechanical Analyzer (DMA) system. The effects of strain
amplitude and driving frequency on viscoelastic properties of MREs were analyzed. |
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