Effect of Surface Roughness on the Stick-slip Behavior of Magnetic Field Controlled-dipolar Suspensions in Simple Linear Shear Mode

Abstract

Abstract. The effect of surface roughness on the stick-slip motion of Magnetorheological (MR) fluids under a simple linear shear mode has been experimentally reported. The shear stress of the MR fluids could be modulated by the changing of the surface roughness. The rate of energy accumulation and releasing during stick-slip motion changed with respect to the shear plates of different surface roughness. The changing of the stick-slip motion based on the different surface roughness was ascribed to the evolution of internal particle structures when shear motion was applied to the aggregates of the particles exposed to the external magnetic field.

Influence of magnetic property of test plates on magneto-rheological behavior

“…Therefore, poor lubrication state led to higher yield stresses. The conclusion was similar to the conclusions of Shan et al [45][46][47][48][49][50][51]. Moreover, the greater the value was, the greater the yield stress was likely to be, and the greater possibility of being in boundary lubrication was.…”

“…Recently, Tian et al [45][46][47] also found that the friction effect at the interfaces of particles and plates which could affect the force transmission between the particle chains and the plate of MRFs. Among them, the competition between friction, magnetic field forces, and fluid viscous forces determined the particle structure of the MRF and its rheological properties [48][49][50][51][52].The changes of plate properties affected the lubrication states of test plates and particles/clusters in MRFs which had significantly influence the evolution of particle structures and shear stress transmissions.…”