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Rheological Characterization of Magnetorheological Finishing Fluid

机译：磁流变整理液的流变特性

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摘要

Magnetorheological finishing (MRF) is a precision material removal process that has been applied to a large variety of brittle materials, from optical glasses to hard crystals, such as sapphire. MRF is based on a magnetorheological (MR) fluid that consists of carbonyl iron powder (CIP), polishing abrasives, water, and stabilizers. To understand and model this process correctly, it is important to study the rheological properties (yield stress and viscosity) of the fluid under the influence of the magnetic field. A detailed study through statistical design of experiments (DOE) is conducted to characterize rheological properties of MR fluid. Three constitutive models viz. Bingham Plastic, Herschel-Bulkley, and Casson fluid are used to characterize the rheological behavior of MR fluid. Response surface methodology (RSM) is applied to predict the effect of volume concentration of each component in MR fluid. Analysis of Variance (ANOVA) is conducted, and contribution of each model term affecting improvement in yield stress and viscosity is calculated. To estimate the saturation magnetization of MR fluid, M-H curve is plotted using vibrating sample magnetometer (VSM), and effect of temperature on yield stress and viscosity is discussed. The experimental results are discussed, and optimum fluid composition is identified from the selected range.
机译：磁流变精加工（MRF）是一种精密的材料去除工艺，已应用于从光学玻璃到蓝宝石等硬质晶体的各种脆性材料。 MRF基于磁流变（MR）流体，该流体由羰基铁粉（CIP），抛光磨料，水和稳定剂组成。为了正确地理解和建模此过程，研究在磁场影响下流体的流变特性（屈服应力和粘度）非常重要。通过实验统计设计（DOE）进行了详细的研究，以表征MR流体的流变特性。三种本构模型。 Bingham Plastic，Herschel-Bulkley和Casson流体用于表征MR流体的流变行为。应用响应面方法（RSM）来预测MR流体中每种成分的体积浓度的影响。进行方差分析（ANOVA），并计算影响屈服应力和粘度改善的每个模型项的贡献。为了估计MR流体的饱和磁化强度，使用振动样品磁力计（VSM）绘制了M-H曲线，并讨论了温度对屈服应力和粘度的影响。讨论了实验结果，并从选定的范围确定了最佳的流体成分。

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