含位形权重的磁流变液孤立链流变剪应力模型

摘要 为降低采用标准孤立链理论模型计算高体积分数磁流变液流变剪应力时的计算误差，提出一种通过距离权重系数评价磁链间相互作用的流变模型.编写Monte Carlo仿真程序计算颗粒位置与磁矩方向矢量、同时输出与系统颗粒间距有关的距离权重系数.按标准和距离权重这两种链结构模型计算磁流变液剪切应力数值，并和4种磁流变液(30.58%~44.79%)的流变仪剪应力测试数据进行比较，结果显示，权重模型在磁场全范围内具有更高的计算精度，并且和流变试验实际结果基本符合，证实了磁链微观结构间的相互作用力是影响磁流变液流变特性的主要因素之一.
Abstract：For reducing the error in calculating shear stress of high volume concentration magnetorheological fluids by applying standard isolated chain theoretical model， a new rheological model was proposed to evaluate interaction of magnetic chains by distance weighted coefficients. A Monte Carlo program was written for simulating position coordinates and direction of magnetic moment of carbonyl iron particles in magnetorheological fluids system， with two distance-related coefficients output. Comparing theoretical values of standard and distance weighted shear stress model with four magnetorheological fluids’ testing data that measured by rheometer， results indicated that distance model has higher computational accuracy at the whole experimental range of magnetic field than that using standard isolated chain-based one， and it generally aligned with rheological results， which proves interaction force between magnetic chains is one of impact factors that can significantly affect rheological characteristic of magnetorheological fluids.