基于有限元方法的磁流变液微结构磁化及宏观力学特性分析

摘要

Taking into account the effects of the magnetic saturation and non-linear magnetization,a finite element analysis is performed for the magnetic-mechanic responses of a single chain in a magnetorheological fluid（MRF）.The effect of the number of the particles in a chain on the shear resistance is investigated.Making used of a statistical approach,the critical shear stress of MRFs are obtained,and the results are identical with the experimental results.It is found that finite element method can be used to describe the response of MRFs,which may be of help for the initial design and optimization of high-performance MRFs.%采用有限元软件ANSYS建立了磁流变液的单链力学模型,考虑颗粒的非线性磁化及磁化饱和过程,计算了单链的磁场分布,以及单链中颗粒数量对剪切力的影响。基于统计力学的方法,从磁流变液的微结构出发,利用Maxwell应力张量,得到了磁流变液的力学响应特性,计算结果能较好地描述有关实验现象,表明有限元方法可用于磁流变液实际问题的分析,这对新型高性能磁流变液材料的设计具有一定的指导作用。