Magneto-mechanical response of additive-free Fe-based magnetorheological fluids: role of particle shape and magnetic properties

Anupama, A.V.; Kumaran, V.; Sahoo, Balaram

doi:10.1088/2053-1591/aaabcc

Cited by 32 publications

(12 citation statements)

References 54 publications

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“…An increase in sedimentation stability of plate‐like CI‐based MRFs was reported by Shilan et al [ 74 ] due to friction forces and increased contact area between particles. In similar experiments, Anupama et al [ 75 ] reported that the spherical CI‐based MRFs exhibited a lower off‐state viscosity and a higher τ y value of 23.5 kPa compared with irregularly shaped electrolytic iron (EI)‐based MRFs (14.2 kPa) at 1.2 T due to the spherical shape of CI particles that flows easier.…”

Section: Ci‐based Mrfsmentioning

confidence: 91%

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: 91%

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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“…It is because the size of the CI particles is smaller than the size of the EI particles, as well as irregular shape of EI particles. MRFs having smaller size particles tends to settle less [20]. The yield strength developed is also more in case of MRF/GMRF having CI particles as the suspended particles because of the spherical structure of CI particles [7].…”

Section: Effect Of the Type Of Suspended Particlesmentioning

confidence: 99%

“…This exclusive property of MRF is utilized in many commercial applications of semi active devices such as dampers, clutches, actuators and other applications such as medical applications, glass polishing and many more [10][11][12][13][14][15][16][17][18][19]. The rheological properties of MRFs depend on the type of suspended particles used and their concentration and the applied magnetic field [20]. Different kind of magnetic particles has different shapes and structures.…”

Section: Introductionmentioning

confidence: 99%

Study on Sedimentation Stability of Mahua and Simarouba Oil Based Magnetorheological Fluids

Vannarth¹,

Babu²,

Jebraj³

2019

Acta mech. Malays.

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Magnetorheological fluids (MRFs) are peculiar of smart fluids whose rheological properties can be efficiently controlled by varying applied magnetic field. Owing to this peculiar property, it can be utilized in industrial applications in semi-active devices such as dampers, actuators, etc. In this work, an effort has been attempted to produce MRFs using natural oils as carrier fluids and tested for potential replacement of conventional carrier fluids such as silicone oil. The MR fluids are prepared using silicone oil and two natural oil namely Mahua oil and Simarouba oil. Carbonyl iron (CI) and Electrolytic iron (EI) are used as suspended particles with lithium grease as an additive. The MRF using two natural based oil are known as Green magneto rheological fluids (GMRF). The characterization of suspended particles and carrier liquids was performed, followed by tests on sedimentation stability of prepared samples. To compare the sedimentation stability, the graphs of sedimentation ratio versus time are plotted for all MR fluids samples. It is found that the sedimentation stability of natural oils based MRFs are relatively better than silicone oil based MRFs for the same concentration of magnetic particles. There is potential of these natural oils based MRFs to replace the conventional MRFs However, other rheological properties like yield strength, flow characteristics etc. needs further investigation.

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“…Figure 1 shows the arrangement of magnetic particles with and without a magnetic field. The magnetorheological response depends strongly on the physical (size, distribution, and shape) and magnetic (saturation magnetization) nature of the particles in MRF [16]. The application of MRF can be found in elevators [17], industrial shock absorbers [18], seismic response reduction devices [19][20], vehicle suspension systems [21][22], stab or bullet resistance vests [23][24] and rehabilitation devices [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Development and Implementation of Energy-Efficient Magnetorheological Fluid Bypass Damper for Prosthetics Limbs Using a Fuzzy-Logic Controller

et al. 2022

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Walking behaviour in amputees with lower-limb loss is absent from shock-absorbing properties. A damper can be used to reduce the impact of ground reaction force (GRF) during heel strikes. Magnetorheological fluid (MRF) damper is deemed the best option for this application as it includes the advantages of both passive and active dampers. An enhanced MRF damper is essential in supplying the appropriate current and damping force levels. Therefore, an energy-efficient design is required to prolong the battery life used by MRF dampers in prosthetic limbs. This paper investigates two fluids of different properties and magnetic particle volume content. A bypass damper was used to observe the response of both fluids. The findings highlighted that an MRF with a higher percentage of solid weight could produce a more significant damping force with a lesser amount of applied current. This work presents a simulation study on implementing the energy-efficient MRF damper utilizing a Fuzzy-PID controller in a prosthetic limb.

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Magneto-mechanical response of additive-free Fe-based magnetorheological fluids: role of particle shape and magnetic properties

Cited by 32 publications

References 54 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

Study on Sedimentation Stability of Mahua and Simarouba Oil Based Magnetorheological Fluids

Development and Implementation of Energy-Efficient Magnetorheological Fluid Bypass Damper for Prosthetics Limbs Using a Fuzzy-Logic Controller

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