Numerical Investigation of Yield Stress and Damping Force for a Modeled Damper Using Different MR Fluids

Abstract

This article presents the yield stress, shear damping force, viscous damping force, and total damping force generated in a modeled damper using various magnetorheological (MR) fluids. The values of the generated magnetic field intensity in a modeled damper have been obtained by performing a magnetostatic analysis using ANSYS Maxwell v.16 software. All the used MR fluids exhibit growth in yield stress and damping force on increasing the input current. The magnetic field intensity values are fitted into yield stress-magnetic field intensity quadratic equations which are developed for all the used MR fluids using the least square techniques in order to compute the yield stress. The estimated yield stress is maximum for AMT RHEOTEC⁺ fluid and lowest for MRF-122EG for all input current values. The computed yield stress of in-house prepared optimal MR fluid exhibits good agreement with the commercially available MR fluids. The results exhibit that the MRF-140CG owns the largest viscous damping force (90.72 N) while MRF-122EG owns the lowest viscous damping force (13.61 N) for the modeled damper. AMT RHEOTEC⁺ fluid possesses the largest shear damping force (controllable force) as well as total damping force while MRF-122 EG is the one that exhibits the lowest value for shear as well as total damping force