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不同体积分数磁流变液对其剪切特性的影响
引用本文:朱绪力,孙慧敏,刘南南,卫洁.不同体积分数磁流变液对其剪切特性的影响[J].科学技术与工程,2019,19(14):183-186.
作者姓名:朱绪力  孙慧敏  刘南南  卫洁
作者单位:山东科技大学机械电子工程学院,青岛,266590;山东科技大学机械电子工程学院,青岛,266590;山东科技大学机械电子工程学院,青岛,266590;山东科技大学机械电子工程学院,青岛,266590
基金项目:“复杂磁场和流场中磁流变液的摩擦机理及特性研究(51575323)” 。
摘    要:为研究不同体积分数磁流变液的剪切性能,分别制备出不同体积分数(10%、20%、30%、40%)的四种磁流变液;使用流变仪分别测出这四种磁流变液在不同剪切速率(0~1 000 s~(-1))下的剪切应力和表观黏度,分析其剪切性能;并用Bingham模型进行拟合,得到剪切应力、表观黏度和体积分数之间的定量关系。结果表明:在相同的体积分数下,随着剪切速率的增加,磁流变液的剪切应力缓慢增大,表观黏度呈指数下降;剪切速率不变的前提下,随着体积分数从10%增大到40%,磁流变液的屈服应力从3. 9 kPa增大到14. 2 kPa,表观黏度明显增大,塑性黏度系数从3. 2增大到3. 7,流动特性指数n减小。可见,体积分数高的磁流变液其剪切性能越好,在智能机构等方面得到广泛应用。

关 键 词:磁流变液  剪切应力  体积分数  表观黏度
收稿时间:2018/4/24 0:00:00
修稿时间:2018/6/12 0:00:00

Effect of Magnetorheological Fluids with Different Volume Fractions on Shear Properties
Zhu Xu-li,Liu Nan-nan and Wei Jie.Effect of Magnetorheological Fluids with Different Volume Fractions on Shear Properties[J].Science Technology and Engineering,2019,19(14):183-186.
Authors:Zhu Xu-li  Liu Nan-nan and Wei Jie
Institution:School of Mechanical and Electronic Engineering, Shandong University of Science and Technology,,,
Abstract:In order to study the shear properties of magnetorheological fluids with different volume fractions, four magnetorheological fluids with different volume fractions (10%, 20%, 30%, and 40%) were prepared and measured using a rheometer. The shear stress and apparent viscosity of a magnetic rheological fluid at different shear rates (0-1000 s-1) were analyzed and the shear properties were analyzed. The shear stress, apparent viscosity, and volume were obtained by fitting with the Bingham model. The quantitative relationship between scores. The results show that under the same volume fraction, with the increase of shear rate, the shear stress of magnetorheological fluid increases slowly, the apparent viscosity decreases exponentially; under the premise of constant shear rate, with the volume fraction From 10% to 40%, the yield stress of MR fluid increases from 3.9 KPa to 14.2 KPa, the apparent viscosity increases obviously, the plastic viscosity coefficient increases from 3.2 to 3.7, and the flow characteristic index n decreases. It can be seen that the magneto rheological fluid with high volume fraction has better shear performance and is widely used in intelligent mechanisms.
Keywords:magneticrheological  fluid    shear  stress    volume  fraction    apparent  viscosity
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