Microscopic modeling of magnetorheological fluids containing spherical and ellipsoidal ferromagnetic particles

Abstract

Based on the magnetic dipole theory, the study of the single-chain structure of ferromagnetic particles in magnetorheological fluids(MRFs), and the analysis of the scanning electron microscope(SEM) image processing of ferromagnetic particles, a micromechanical model of MRFs containing spherical and ellipsoidal ferromagnetic particles was established. MRFs with different particle volume fractions were prepared, the shear properties of MRFs under different magnetic induction strengths were tested, and theoretical and experimental data were compared. Varying the volume fraction of the ferromagnetic particles and magnetic induction strength in MRFs at constant temperature and shear rate, the shear stress increases with increasing particle volume fraction and magnetic induction intensity. The MRF micromechanical model containing spherical and ellipsoidal ferromagnetic particles is more accurate than the model with only single-size spherical ferromagnetic particles, and the accuracy is improved by 16.85%.