磁流变液的流变特性分析和实验验证

摘要

Silicone-based Magnetorheological Fluids (MRFs) were prepared with 10％ volume fraction of carbonyl iron powder.Rheometer Physica MCR 301 was used to test the rheological performances of MRFs.Bingham model and Casson model were used to calculate the rheological performances of MRFs.The experimental results show Bingham model and Casson model could well describe rheological behaviors of MRFs.Shear stress of MRFs increases but apparent viscosity is significantly decreased and tends to be stable with the increase of shear rate in the presence of magnetic field.The results also show that MRFs are shear thinning fluids.By Logarithmic fitting,the dependence of shear stress on magnetic field was obtained.Under the condition of constant shear rate and increasing magnetic field,shear stress of MRFs increases remarkably.%本研究制备了羰基铁粉体积分数为10 ％的硅油基磁流变液,使用Physica MCR 301流变仪测试其流变性能,用Bingham模型和Casson模型对磁流变液的流变性能进行拟合计算.实验表明,Bingham模型和Casson模型均可较好地描述磁流变液的流变行为,在磁场作用下,随着剪切速率增加,剪切应力增大并趋于稳定,表观粘度显著减小,磁流变液存在剪切稀化现象.通过对数拟合的方法,得出磁流变液剪切应力和磁场的关系,剪切速率恒定时,随着磁场增大,磁流变液剪切应力显著增加.