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Experimental Evaluation of a Variable Shear Modulus Characteristic for Magnetorheological Elastomer Due to Induced Current

机译:感应电流引起的磁流变弹性体的可变剪切模量特性的实验评估

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The purpose of this study is to fabricate an anisotropic magnetorheological elastomer (MREs) based on natural rubber (NR) that has a more advanced MR effect than isotropic MREs by using an anisotropic mold. We evaluated variation in the shear modulus of the MREs in the frequency domain under a magnetic field with a continuously-variable induced current. An evaluation system is proposed that includes a magnetic flux generator, which generates a magnetic field via a continuously-variable induced current. One of the anisotropic MREs possessing 30 vol. %, 40 vol. %, and 50 vol. % carbonyl iron powder was expected to have the highest shear modulus variation as a function of the variable induced current. With the evaluation system, we identified the variation and maximum variation rate of the shear modulus of MREs with three different volume fractions of carbonyl iron powder (CIP) and continuously-variable induced current. The magnetic flux density generated by the magnetic flux generator (MFG) is optimized by electromagnetic finite element method (FEM) analysis and response surface method techniques. The values of each design factor determined by the response surface method (RSM) were applied to the redesign of the evaluation system, including the MFG. The proposed system is verified for the range in which MFG can generate magnetic flux density in order to determine the existence of magnetic saturation of the MFG by magnetic circuit analysis. Consequently, the appropriate volume fraction of CIP in MREs without inducing currents can be determined for any desired shear modulus. The desired volume fraction of CIP in the anisotropic MREs can be approximated to achieve an appropriate shear modulus variation rate. This study demonstrates that it is possible to obtain an appropriate volume fraction of CIP and induced current to achieve the desired shear modulus variation rate of an anisotropic MRE.
机译:这项研究的目的是通过使用各向异性模具制造一种基于天然橡胶(NR)的各向异性磁流变弹性体(MRE),该弹性体具有比各向同性MRE更高的MR效应。我们在磁场中使用连续可变的感应电流评估了MRE在频域中的剪切模量的变化。提出了一种评估系统,其包括磁通量发生器,该磁通量发生器通过连续可变的感应电流产生磁场。各向异性MRE之一,体积为30。 %,40卷%和50卷期望%羰基铁粉具有最高的剪切模量变化,其是可变感应电流的函数。借助评估系统,我们确定了三种不同体积分数的羰基铁粉(CIP)和连续可变感应电流的MRE剪切模量的变化和最大变化率。通过电磁有限元方法(FEM)分析和响应面方法技术优化了磁通量发生器(MFG)产生的磁通量密度。通过响应面法(RSM)确定的每个设计系数的值都应用于评估系统(包括MFG)的重新设计。通过磁路分析确定提出的系统在MFG可以产生磁通密度的范围内进行验证,以确定MFG的磁饱和度。因此,对于任何所需的剪切模量,可以确定MRE中CIP的适当体积分数而不会产生电流。可以估计各向异性MRE中CIP的所需体积分数,以实现适当的剪切模量变化率。这项研究表明,有可能获得适当的CIP体积分数和感应电流,以实现各向异性MRE所需的剪切模量变化率。

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