钛酸钙系电流变液在直流电场下损耗模量的研究  

On the Loss Modulus of Ca_2TiO_3 Based ER Fluid in DC Field

作　　者：陈恒[1] 龚兴龙[1] 江川霞[2] 江万权[2] 张忠[3] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230027 [2]中国科学技术大学化学系,安徽合肥230026 [3]国家纳米科学中心,北京100080

出　　处：《实验力学》2009年第2期96-102,共7页Journal of Experimental Mechanics

基　　金：国家重点基础研究发展计划资助项目(2007CB936800)

摘　　要：研究了直流电场下钛酸钙系电流变液在动态振荡剪切模式下损耗模量的变化。用流变仪测试了不同颗粒体积分数材料在不同的温度和电场下损耗模量随应变的关系曲线。讨论了颗粒体积分数、温度、电场强度以及频率对材料损耗模量的影响。以理论推导和试验数据拟合的方法给出了损耗模量与颗粒体积分数、振荡频率、温度以及电场强度等参数的半经验数学关系式。理论值对比试验结果表明,本文损耗模量表达式与试验结果符合较好,可以用于预测直流电场下钛酸钙系电流变液在动态振荡剪切模式下颗粒体积分数、温度、电场强度、频率和剪切应变对损耗模量的影响。Results of investigation on loss modulus of Ca2TiO3 based electrorheological （ER） fluids in a dynamic shear mode and a DC field is presented in this paper. The loss modulus-strain curves of materials with various particle volume fractions were obtained by using Rheometer at various temperature and electric field strength. The effect of particle volume fraction, temperature, electric field strength, frequency and shear strain on the lose modulus were discussed. By methods of theoretical deduction and data fitting, a semi-empirical mathematical expression relating the lose modulus with particle volume fraction, oscillation frequency, temperature and electric field strength was proposed. Simulation results show a good agreement between the expression and the experimental data. The semi-empirical expression can be used to predict the loss modulus behavior of Ca2 TiOa based ER fluids in ;carious particle volume fractions, temperature, electric field strength, frequency and shear strain in a dynamic shear mode and a DC field.

关 键 词：电流变液 动态剪切 损耗模量 

分 类 号：O37[理学—流体力学] O469[理学—力学]