Microstructural Mechanical Analysis and Dynamics Simulation of Hollow Soft Magnetic Particle-Based Magnetorheological Fluids

The hollow soft magnetic particle-based magnetorheological (MR) fluid has been extensively studied due to its good anti-settling property. However, studies are mainly focused on experiments, and the discussion of the mechanism is still inadequate, especially considering multiple influencing factors under coupled fields. In this paper, based on the magnetic dipole theory, we established a dynamic model of hollow particles in magnetorheological fluid under the magnetic-shear coupling field. Molecular dynamics simulations were adopted to simulate the microstructure evolution of the magnetorheological fluid in two-dimensional scale, and the effects of hollow radius, magnetic field strength, volume fraction and shear rate on the rheological properties were analyzed. The results show that these factors significantly affect the response time and yield stress of the magnetorheological fluid.