Analysis of Rheological Properties of MR Fluid Based on Variation in Concentration of Iron Particles

The present paper focuses on preparation and process of the magnetorheological (MR) fluid whose carrier fluid is silicone-based oil and its additive is the commercial grease with different concentration of iron particles. General properties of MR fluid are discussed and rheological properties like shear rate, shear stress, viscosity of MR fluid can be found by using cone-and-plate sensor system-type rheometer. The result shows that shear stress as a function of magnetic flux density and viscosity does not strictly scale with iron loading.

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Investigation of steady state rheological properties and sedimentation of coated and pure carbonyl iron particles based magneto-rheological fluids

Materials Today Proceedings ◽

10.1016/j.matpr.2020.05.364 ◽

2020 ◽

Author(s):

K.V. Swaroop ◽

M.N. Aruna ◽

Hemantha Kumar ◽

M.R. Rahman

Keyword(s):

Steady State ◽

Rheological Properties ◽

Carbonyl Iron ◽

Iron Particles ◽

Magneto Rheological

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Experimental studies on magnetorheological brake containing plane, holed and slotted discs

Industrial Lubrication and Tribology ◽

10.1108/ilt-12-2015-0205 ◽

2017 ◽

Vol 69 (2) ◽

pp. 116-122 ◽

Cited By ~ 3

Author(s):

Chiranjit Sarkar ◽

Harish Hirani

Keyword(s):

Experimental Studies ◽

State Condition ◽

Frictional Torque ◽

Iron Particles ◽

Low Friction ◽

Mr Fluid ◽

Content Type ◽

Shear Rates ◽

Mr Fluids ◽

Braking Torque

Purpose This study aims to design an ideal magnetorheological (MR) brake that exerts negligible frictional torque in the off-state condition and controllable frictional torque in the on-state condition. Design/methodology/approach Silicone-based MR fluid, containing 9 per cent volume carbonyl iron particles, has been synthesized and used. The synthesized MR fluid is advantageous in maintaining low friction losses in off-state conditions. A magneto-rheometer has been utilized to characterize the off-state viscosity of the MR fluid at variable shear rates and shear stress of MR fluids at various magnetic fields. A mechanism to enhance the braking torque in the on-state condition has been designed and developed. An experimental test rig has been developed to capture the torque characteristics of the developed MR brakes. Three different designs of MR discs have been experimented under a magnetic field varying from 0 to 375 kA/m. Experimental results of braking torque under shear and compression modes have been presented. Findings Slotted disc MR brake gives much better torque performance. Originality/value The braking torque results motivate to use the slotted disc MR brake for high torque application.

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Solvent Dependence of the Rheological Properties in Hydrogel Magnetorheological Plastomer

International Journal of Molecular Sciences ◽

10.3390/ijms21051793 ◽

2020 ◽

Vol 21 (5) ◽

pp. 1793 ◽

Cited By ~ 2

Author(s):

Norhiwani Mohd Hapipi ◽

Saiful Amri Mazlan ◽

U. Ubaidillah ◽

Siti Aishah Abdul Aziz ◽

Muntaz Hana Ahmad Khairi ◽

...

Keyword(s):

Rheological Properties ◽

Binary Mixtures ◽

Binary Solvent ◽

Iron Particles ◽

Magnetic Performance ◽

Solvent Dependence ◽

Mr Effect ◽

External Stimuli ◽

Pva Hydrogel

Chemically crosslinked hydrogel magnetorheological (MR) plastomer (MRP) embedded with carbonyl iron particles (CIPs) exhibits excellent magnetic performance (MR effect) in the presence of external stimuli especially magnetic field. However, oxidation and desiccation in hydrogel MRP due to a large amount of water content as a dispersing phase would limit its usage for long-term applications, especially in industrial engineering. In this study, different solvents such as dimethyl sulfoxide (DMSO) are also used to prepare polyvinyl alcohol (PVA) hydrogel MRP. Thus, to understand the dynamic viscoelastic properties of hydrogel MRP, three different samples with different solvents: water, DMSO, and their binary mixtures (DMSO/water) were prepared and systematically carried out using the oscillatory shear. The outcomes demonstrate that the PVA hydrogel MRP prepared from precursor gel with water shows the highest MR effect of 15,544% among the PVA hydrogel MRPs. However, the samples exhibit less stability and tend to oxidise after a month. Meanwhile, the samples with binary mixtures (DMSO/water) show an acceptable MR effect of 11,024% with good stability and no CIPs oxidation. Otherwise, the sample with DMSO has the lowest MR effect of 7049% and less stable compared to the binary solvent samples. This confirms that the utilisation of DMSO as a new solvent affects the rheological properties and stability of the samples.

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Performance of Magnetorheological Elastomer Based Silicone/SAIB

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.772.61 ◽

2018 ◽

Vol 772 ◽

pp. 61-65

Author(s):

Muntaz Hana Ahmad Khairi ◽

Saiful Amri Mazlan ◽

Ubaidillah ◽

Siti Aishah Abdul Aziz ◽

Norhiwani Mohd Hapipi

Keyword(s):

Rheological Properties ◽

Silicone Rubber ◽

Carbonyl Iron ◽

Excitation Frequency ◽

Rubber Matrix ◽

Iron Particles ◽

Magnetorheological Elastomer ◽

Magnetorheological Elastomers ◽

Mr Effect ◽

Strain Dependent

This study introduces a sucrose acetate isobutyrate (SAIB) as an additive of magnetorheological elastomers (MREs) to be added in silicone rubber matrix and carbonyl iron particles (CIPs) as their filler. The CIPs were fixed at 60 wt% and two types of MREs sample were fabricated which are isotropic and anisotropic. Rheological properties related to shear storage modulus were measured using a rheometer (MCR 302, Anton Paar). The experimental results demonstrated that the magnetorheological (MR) effect of anisotropic MREs-based Silicone/SAIB was 126 % as compared to isotropic MREs-based Silicone/SAIB, 64%. The fabricated MREs samples were frequency and strain dependent. The relative MR effect for both samples showed decreasing trend with the increment of strain amplitude and excitation frequency.

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PREPARATION AND ABRASION PROPERTIES OF MAGNETO-RHEOLOGICAL FLUID OF DISPERSED SILICA-COATED IRON

International Journal of Modern Physics B ◽

10.1142/s021797920502995x ◽

2005 ◽

Vol 19 (07n09) ◽

pp. 1121-1127 ◽

Cited By ~ 1

Author(s):

A. SHIBAYAMA ◽

T. OTOMO ◽

Y. AKAGAMI ◽

K. SHIMADA ◽

T. FUJITA

Keyword(s):

Carbonyl Iron ◽

Spherical Particles ◽

Fluid Viscosity ◽

Iron Particles ◽

Mr Fluid ◽

Abrasion Test ◽

Silicon Oil ◽

Mr Fluids ◽

Transmission Oil ◽

Magneto Rheological

In this study, a magneto-rheological fluid dispersed by silica-coated iron was developed and its properties such as fluid viscosity (shear stress or shear rate) and abrasion were investigated. The metallic iron coated by silica dispersed in magneto-rheological fluid was prepared by H 2 reducing of precipitated magnetite ( Fe 3 O 4). Then, the magneto-rheological fluid (MR fluid) for the seal was prepared with silica-coated iron or carbonyl iron (HQ type; diameter of 1.6-1.9 10-6m) and two solvent oils i.e. silicon oil (SH200cv, 10000cSt) and CVT oil (T-CVTF, automobile transmission oil). It was observed that the MR fluid viscosity of CVT oil with HQ particles is lower in every fluid condition. Furthermore, the surface roughness of polyvinyl plate after abrasion test for MR fluid with silica coated iron and CVT oil as solvent was higher compared to the other types of MR fluids. The results indicated that carbonyl iron (spherical particles) and silica-coated iron particles dispersed in silicon oil are feasible to be used where the low abrasion in mechanics is required.

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