Abstract
Abstract In this paper, the chain structure of magnetorheological fluid (MRF) magnetic particles was studied and analyzed, the mechanical model of MRF with different diameter ferromagnetic particles was established, silicone oil-based MRF with different particle volume fractions was prepared, the shear properties of the MRF were tested, and the theoretical and experimental data were compared. The experimental results show that the shear stress is stable with the increase of shear strain rate under the action of the magnetic field, and it has a shear thinning effect. The shear stress increases linearly with the increase of particle volume fraction. The shear stress increases with the increase of magnetic induction intensity. After data analysis and in the case of control variables, the average error of improved theoretical data and experimental data is lower than that of previous theoretical data and experimental data, which verifies that the improved theory (mechanical model) has a certain accuracy.
Highlights
Magnetorheological fluid (MRF) is a suspension liquid formed by micron magnitude magnetic particles dispersed in a non-magnetic liquid
To improve the accuracy of the MRF mechanical model, in this paper, authors calculated the interaction between magnetic particles based on the dipole theory, analyzed the chain process of magnetic particles, deduced the mechanical model of the MRF reducer ferromagnetic particles, and prepared the MRF samples for experimental verification
When the particle size a is much smaller than r1 and r2, r is approximate to r1 and r2, obtaining the magnetic field generated by magnetized of a magnetic particle
Summary
Magnetorheological fluid (MRF) is a suspension liquid formed by micron (nanometer) magnitude magnetic particles dispersed in a non-magnetic liquid. Xu et al [12] proposed the hypothesis that the double-chain tightly arranged structure and the Angle between the particle chain and the magnetic field direction followed the exponential distribution and deduced the expression that could describe the shear stress of MRF. Research on a mechanical model of MRF different diameter particles 159 and the shear stress of each influencing parameter. How to calculate the magnetic force between magnetic dipoles and derive the mechanical model of magnetic particles in reducer MRF under different chained structures is a key problem. To improve the accuracy of the MRF mechanical model, in this paper, authors calculated the interaction between magnetic particles based on the dipole theory, analyzed the chain process of magnetic particles, deduced the mechanical model of the MRF reducer ferromagnetic particles, and prepared the MRF samples for experimental verification. Assuming that the size of magnetic particles a is much smaller than the spherical center distance r between magnetic particles, and considering the definition of magnetic dipole moment j and the relationship between magnetic moment and magnetic dipole moment, i.e
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