Mechanism analysis of the carrier viscosity effect on shear stress of magnetorheological fluids

Abstract

Shear stress is an important index to evaluate the rheological behavior of magnetorheological fluids (MRFs), which is not only related to the properties of the ferromagnetic particles, but also...

Numerical Simulation for Microstructure Evolution and Shear Properties of Magnetorheological Gels

“…In the process of collision, the particles show nonlinear elastic characteristics in the contact area, and the repulsive force increases exponentially with the increase of particle deforma-tion. 44 The empirical material parameter κ defines the variation tendency, 43,45 which is set as κ = 100 in our simulation. The parameter F 0 can be determined from the equilibrium relation of the magnetic force and repulsion force when two particles just contact along the direction of the magnetic field, which is calculated as…”

“…Therefore, the concise expression of repulsive force is considered F i r = prefix∑ j ≠ i F 0 exp true[ prefix− κ true( r italicij 2 R − 1 true) true] italicr̂ italicij In the above equation, the direction of the repulsive force is along the line between the centers of the two particles. In the process of collision, the particles show nonlinear elastic characteristics in the contact area, and the repulsive force increases exponentially with the increase of particle deformation . The empirical material parameter κ defines the variation tendency, , which is set as κ = 100 in our simulation.…”