【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。更多还原

【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 ～ 1 000 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 of of 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 to14. 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.更多还原