A Novel Preparation Process for Magnetorheological Fluid with High Sedimentation Stability

Tian, Zhen; Fei, Chen; Wu, Xiangfan; Wang, Jian

doi:10.1080/10426914.2016.1198032

Cited by 17 publications

(7 citation statements)

References 19 publications

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“…The authors observed that on‐state viscosity and τ y of MRFs mainly depended on Fe concentration and type of carrier fluid, whereas the other parameters did not contribute significantly. The authors showed that 32 vol% of 300 mesh Fe dispersed in Mi with 0.5 vol% of OA and 0.7 vol% of TMAH gave an optimized MRF with a τ y of 48.07 kPa (experimentally) and 48.197 kPa (theoretically) at 1 T. A similar approach of using orthogonal array was used by Zuzhi et al, [ 79 ] finding that low stirring temperatures, high stirring speeds, and a short first stirring time before a long second stirring time increased sedimentation stability.…”

Section: Ci‐based Mrfsmentioning

confidence: 96%

Performance and Stability of Magnetorheological Fluids—A Detailed Review of the State of the Art

Thiagarajan

Koh

2021

Adv Eng Mater

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Magnetorheological fluids (MRFs) are functional materials, prepared by dispersing magnetic particles in a nonmagnetic carrier fluid, that exhibit a change in mechanical properties (e.g., increase in viscosity and yield stress) when subjected to a magnetic field. Change in mechanical properties is demonstrated by a fast (i.e., fraction of milliseconds) and reversible transition from a liquid‐ to a solid‐like state. This transition, due to a structural reorganization of magnetic particles in the carrier fluid, makes MRFs a valuable material for damping, breaking systems, medical and prosthetics, and robotics. Since the discovery of MRFs in 1948, developing MRF preparation methods that result in improved performance and the storage without oxidation and settling is paramount. This article presents a review on recent developments in the preparation process of MRFs with a special emphasis on the state of the art in additives and coatings used in enhancing MRF chemical, colloidal, and thermal stability. Recent advances in MRF materials and formulations that have increased yield stress and magnetic properties are discussed. Finally, this review analyses the present‐day challenges in MRF research and makes suggestions for the field to improve MRF stability and performance drawing on previous MRF work and work outside of the fields.

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Section: Ci‐based Mrfsmentioning

confidence: 96%

Performance and Stability of Magnetorheological Fluids—A Detailed Review of the State of the Art

Thiagarajan

Koh

2021

Adv Eng Mater

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“…This could be due to better particle chain formation and higher MR effect in lower viscosity oil. Also, base oil having low viscosity results in quicker response time and easier redispersibility of particles (Zuzhi et al, 2016). Also, the difference in torque values obtained for 50 cSt and 100 cSt based MRFs increases with increase in current supplied.…”

Section: Selection Of Optimal Composition Of Mrfmentioning

confidence: 99%

“…MF75M50 fluid has lowest stability as it contains lower base oil viscosity and larger particle size of iron powder in MRF. However, a lower oil viscosity causes faster response time of MRF and better redispersibility of iron particles after the particles have settled (Zuzhi et al, 2016). MRFs having SSIP have lower slope compared to MSIP based MRFs and takes more time to completely settle indicating higher sedimentation stability of SSIP based MRFs.…”

Section: Selection Of Optimal Composition Of Mrfmentioning

confidence: 99%

Selection of optimal composition of MR fluid for a brake designed using MOGA optimization coupled with magnetic FEA analysis

Acharya

Saini

Sundaram

et al. 2020

Journal of Intelligent Material Systems and Structures

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The design of Magnetorheological (MR) brake and the composition of MR fluid (MRF) used in it have a significant effect on its performance and hence an effort has been made in this study to determine the optimal dimensions of MR brake and composition of MRF suitable for the brake application. Initially, optimum parameters of MR brake were computed considering the properties of commercially available MRF 132DG fluid using multi-objective genetic algorithm (MOGA) optimization. This was performed in MATLAB software coupled with magnetostatic analyses in ANSYS APDL software. The braking torque of designed MR brake utilizing MRF 132DG fluid was experimentally determined and validated with analytical ones. Further, selection of optimal composition of MRF was done considering In-house MRF samples composed of different combinations of particle mass fractions, mean particle diameters and base oil viscosities. A design of experiments (DOE) technique was employed and braking torque corresponding to the synthesized MRF samples at different speeds and current supplied were measured along with the variation of shaft speed during braking process. Grounded on the experimental results, using MOGA optimization technique, MRF composed of smaller sized iron particles (2.91 microns) with mass fraction of 80.95% and lower viscosity base oil (50 cSt) was selected as optimal composition of MRF for use in MR brake. Maximization of field induced braking torque and minimization of off-state torque were chosen as the objective functions for both the optimal design of MR brake and selection of optimal composition of MRF. Finally, the sedimentation stability of MRFs were investigated.

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“…The off-state viscosity of MRF should be as low as possible to reduce the off-state forces and hence increase the dynamic range of the MR damper. Also, a lower viscosity causes a faster response time of MRF and better redispersibility of iron particles [24]. Fumed silica (Sigma-Aldrich) and aluminium distearate (Sigma-Aldrich) with 3% of mass of base fluid were used as additives during the preparation of all the six MRF samples.…”

Section: Synthesis Of Magnetorheological Fluidmentioning

confidence: 99%

Determination of optimal magnetorheological fluid particle loading and size for shear mode monotube damper

Acharya

Saini

Kumar

2019

J Braz. Soc. Mech. Sci. Eng.

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Magnetorheological (MR) fluids belong to a class of controllable fluids, and the composition and concentration of its components govern its magnetorheological properties. In this study, an optimum particle loading (or mass fraction) and size of iron particles in MR fluid for use in a shear mode monotube MR damper were determined based on the damping force and off-state viscosity of synthesized MR fluid samples. Initially, the morphological and magnetic properties of carbonyl iron particles were characterized. Six MR fluid samples were prepared composed of combination of three different particle loadings and two sizes of iron particles. Magnetorheological tests were conducted on these samples to determine the flow curves at off-state and on-state magnetic field conditions. Herschel-Bulkley model was used for mathematical representation of flow curves at different magnetic fields and to determine their dynamic yield stress. Further, a shear mode monotube MR damper with accumulator was designed by using optimization technique for desired dynamic range and damping force. Magnetostatic analysis was performed to determine the magnetic field strength generated in the shear gap at different currents. The damping force was calculated for synthesized MR fluids based on their dynamic yield stress corresponding to the magnetic field strength in the shear gap. Analysis of variance was performed to analyse the significance of independent factors on the damping force and off-state viscosity of MRF. The optimal particle loading and size which yielded maximum damping force with minimum off-state viscosity were determined using a multi-objective genetic algorithm.

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A Novel Preparation Process for Magnetorheological Fluid with High Sedimentation Stability

Cited by 17 publications

References 19 publications

Performance and Stability of Magnetorheological Fluids—A Detailed Review of the State of the Art

Performance and Stability of Magnetorheological Fluids—A Detailed Review of the State of the Art

Selection of optimal composition of MR fluid for a brake designed using MOGA optimization coupled with magnetic FEA analysis

Determination of optimal magnetorheological fluid particle loading and size for shear mode monotube damper

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