Study on movement mechanism of magnetic particles in silicone rubber- based magnetorheological elastomers with viscosity change

摘要

Current studies on magnetorheological elastomers (MREs) are mainly focused on the mechanical properties after curing. However, very few studies have been conducted on the relationship between the viscosity characteristics and the movement mechanism of the magnetic particles during curing. Aimed at the problems above, the movement mechanism of magnetic particles combined with viscosity characteristics under external magnetic field is studied based on the silicone rubber-based MRE during the curing process. First, we prepared silicone rubber-based MREs under different magnetic field conditions and with different volume fractions. Further, we tested and applied the law of viscosity change during the curing of the silicone rubber-based MRE, via numerical simulation using the Stokes equation, and established the corresponding mechanical theory model. Finally, we successfully simulated the movement state of the magnetic particles for magnetic field conditions and particle volume fractions, and discussed the chain formation mechanism of these particles based on the relationship between the viscous and magnetic forces by correcting the Mason number formula.