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首页> 外文期刊>Smart Materials & Structures >Preparation of magnetorheological elastomers and their slip-free characterization by means of parallel-plate rotational rheometry
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Preparation of magnetorheological elastomers and their slip-free characterization by means of parallel-plate rotational rheometry

机译：通过平行板旋转流变测量制备磁流变弹性体及其防滑特性

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摘要

A systematic study is presented to highlight a methodology of sample preparation and subsequent slip-free characterization of magnetorheological (MR) elastomers in parallel-plate rotational rheometry. Focusing on the magnetic field-dependent nonlinear viscoelastic behavior an array of oscillatory strain sweep measurements is conducted with samples cured within the rheometer. The examined nonlinear material response (i.e. the amplitude dependence of the storage and loss moduli) as a function of the applied magnetic field is found to be qualitatively similar to the amplitude dependence of particle reinforced elastomers (i.e. the Payne effect). Therefore, the experimental data (both moduli) is decomposed similar to that for reinforced elastomers and a phenomenological model is formulated for both the storage and loss modulus to account for the physical mechanisms governing the nonlinear material characteristics. Parameter identification suggests that the material response at low magnetic fields is dominated by the polymeric network whereas the strong magneto-reinforced microstructure governs the linear and nonlinear viscoelastic behavior at high magnetic fields. The overall experimental outcome further suggests that the underlying concept of the phenomenological model for particle reinforced elastomers (i.e. destruction and reformation of the filler network) can be transfered to MR materials. Consequently, the proposed phenomenological model can be applied to quantify and further analyze the nonlinear response characteristics of MR elastomers (i.e. the amplitude dependence of the storage and loss modulus as a function of the applied magnetic field) that is closely linked to microstructural changes of the magnetizable particle network.
机译：提出了一种系统研究以突出样品制备方法和随后在平行板旋转流变仪中的磁流变（MR）弹性体的无滑动表征。专注于磁场依赖性非线性粘弹性行为，通过在流变仪内固化的样品进行振荡应变扫描测量阵列。发现作为施加的磁场的函数的检查的非线性材料响应（即储存和损失模量的幅度依赖性）与颗粒增强弹性体的幅度依赖性（即薪水效应）定性类似。因此，实验数据（两种Moduli）类似于加强弹性体的分解，并且为储存和损耗模量配制了现象学模型，以考虑有关非线性材料特性的物理机制。参数识别表明，低磁场处的材料响应由聚合物网络主导，而强磁增强微观结构在高磁场处控制线性和非线性粘弹性行为。整体实验结果进一步表明，颗粒增强弹性体的现象模型的潜在概念（即填充网络的破坏和重整）可以转移到MR材料。因此，可以应用所提出的现象学模型来量化和进一步分析MR弹性体的非线性响应特性（即，作为所施加的磁场的函数的储存和损耗模量的幅度依赖性），其与施加的磁场的函数紧密相关可磁化粒子网络。

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