磁流变液屈服应力计算模型研究

为了改善磁流变液颗粒链模型的准确性,对比分析了经典偶极子模型、局部场偶极子模型及有限元模型的适用范围,提出了一种新型颗粒链计算模型———分裂偶极子模型,并计算了分裂磁偶极矩,得到颗粒间作用力的误差大小.研究表明:颗粒链在外加磁场作用下,其作用力模型可以用两对经典偶极子模型表示;当外加磁场较小时,分裂偶极子模型中心线磁场误差大于20%,此时模型不再适用;当外加磁场为中强磁场时,分裂偶极子模型适用于任意颗粒间距,且其中心线磁场误差小于15%,颗粒间相互作用力误差小于10%,分裂偶极子模型优于经典偶极子模型和局部场偶极子模型.

The yield stress model of magnetorheological fluids

In order to improve the accuracy of a single chain based model,the validity limits for the classic dipole model,local dipole model and finite element model were comparatively analyzed.A splitting dipole model was then proposed and the magnetic dipole moment and the error of splitting dipole model were obtained.The results show that the interaction force of particles under the application of applied magnetic field can be expressed by two pairs of classic dipoles;when the applied magnetic field is small,the error of magnetic field in the middle line of the two dipoles is higher than 20% and the splitting model is invalid;when the applied magnetic field is stronger,the splitting model is valid for any distance and the error of magnetic field in the middle line of two dipoles is less than 15%,the error of interaction force obtained by splitting model is smaller than 10%,the splitting model is better than the classic dipole model and local dipole model in calculating the attractive force of particles in magnetorheological fluids.