基于有限元计算的磁流变液特性分析及其与基于磁偶极子模型结果的比较

FE computation based modeling for MRFs and comparison with magnetic-dipoles based results

采用ANSYS有限元软件,计算了磁流变液单链在剪切过程中的力学特性,并以此为基准分别与基于简化偶极子模型和基于不简化偶极子模型的结果进行了比较。结果表明,简化偶极子模型在描述磁流变液力学特性方面具有较高的精度,但由其得到的剪切屈服应力略低于有限元计算结果。这对于改进偶极子模型以建立磁流变液性能更精确快捷的多层次描述方法,进而设计高性能磁流变液具有重要的意义。

Based on the FE code ANSYS, the resistance of a particle-chain against the shear deformation of a magnetorheological fluid is analyzed. A micro-macro modeling for the response of MRFs subjected to shearing deformation is then derived by making use of a statistical approach. The results are compared with those obtained with the approaches based on the conventional magnetic dipole model with and without adopting the assumption that the size of the particles is much smaller than the distance between particles, respectively. It shows that the former can better replicate results with FE computation. This verification is significant because the magnetic dipole model is the fundamental element in formulating a micro-macro approach for the analysis of the macroscopic constitutive behavior of magnetorheological fluids.