Magnetorheological characterization of carbonyl iron based suspension stabilized by fumed silica

Lim, Sang Kyoo; Cho, Min Seong; Jang, I.B.; Choi, Hyoung Jin

doi:10.1016/j.jmmm.2004.04.040

Cited by 141 publications

(36 citation statements)

References 8 publications

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“…Its primary function is to offer a medium for magnetically active particulates to remain suspended during the absence of magnetic field and to undergo realignment with the application of magnetic field. Some of the carrier fluids are poly vinyl-n-butyl and naphthol-thickened kerosene 7 , silicone oil 8,9 , white and light grade mineral oils 10 , honge oil 5 , a combination of synthetic oil, water and organic liquids 11 . Silicone oil is widely selected as a carrier fluid, due to its superior qualities, such as good temperature stability, good heat transfer characteristics, oxidation resistance 12,13 , very low vapour pressure and high flash points.…”

Section: Ingredients Of Mr Fluidsmentioning

confidence: 99%

Developments in Vibration Control of Structures and Structural Components with Magnetorheological Fluids

Raju¹,

Varma²

2017

Current Science

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Vibration isolation and control of structures subjected to different types of dynamic loads due to periodic forces, impact and shock type forces and earthquake forces is an important area in structural engineering. The structures can be machine foundations, buildings, bridges, towers, automobiles, ship structures, military tanks and aeronautical structures. Some of these devices used are elastic springs, viscoelastic dampers, viscous fluid dampers, magnetorheological dampers and friction dampers. This article gives latest developments in vibration control of structures and structural components using magnetorheological fluids. The current status of technology and further research requirements to be studied in these areas are highlighted.Keywords: Automobile brakes, magnetorheological fluids, structure and structural components, suspension systems, vibration control.IMPROVEMENT in manufacturing technology has provided machines of higher ratings, longer bridges, taller buildings which requires to satisfy the static, dynamic capacity and serviceability and stability limits for members/ systems prescribed by codes of practice. These machines/ structures give rise to considerable higher dynamic forces and thereby higher stresses. This demands development of advanced control and safety systems to keep the structural members/systems static and dynamic responses within tolerable levels. The performance, safety and stability of structures supporting the machines/structures depend largely on their design of suspension systems and their interaction with the environment. In this article, current status of technology in development of magnetorheological and friction dampers and their use in vibration control of structural and structural components in different fields of engineering applications are presented.

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Section: Ingredients Of Mr Fluidsmentioning

confidence: 99%

Developments in Vibration Control of Structures and Structural Components with Magnetorheological Fluids

Raju¹,

Varma²

2017

Current Science

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“…The sample was placed vertically on a static stage at room temperature. [13] The settling of magnetic particles in the silicone oil results in forming a transparent layer. [14] Throughout the measurement, the volumes of the transparent layer were …”

Section: Stability Test Of the Mr Fluidsmentioning

confidence: 99%

Study on preparation and thermal conductivity of high stability magnetorheological fluids

Cheng

Wang

Liu

2014

Journal of the Chinese Advanced Materials Society

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A surface modifier, which has lipophilic groups and chelating groups, was synthesized, and used to modify the surface characteristics of carbonyl iron particles and prepare composite magnetic particles (CMPs). Then a set of oil-based magnetorheological (MR) fluids based on the CMPs were prepared. Finally, the relationship between thermal conductivity and concentration of MR fluids were studied, and an analysis model on thermal conductivity and concentration of MR fluids was built. The result shows that there is a linear correlation between thermal conductivity and concentration of MR fluids, namely k eff ¼ 0.0245 F À 0.08 and k eff /k f ¼ 0.167 F À 0.53 (10 F 50). Applying this model, the concentration variation of the MR fluids can be acquired on the basis of the thermal conductivity variation, and the model can be used to evaluate the sedimentation stability of the MR fluids.

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“…Reasonable success has been achieved through the use of stabilizing additives that provide a steric hindrance to particle aggregation. Additives such as ferromagnetic nanoparticles (Chin et al 2001;Lopez-Lopez et al 2005), fumed silica (Lim et al 2004), organoclays (Lim et al 2005), and magnetizable nanofibers (Ngatu et al 2008) have been used for this purpose. Arguably the most robust methods for inhibiting sedimentation involve modifying the matrix fluid rheological properties.…”

Section: Introductionmentioning

confidence: 99%

Magnetorheology in an aging, yield stress matrix fluid

2012

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Field-induced static and dynamic yield stresses are explored for magnetorheological (MR) suspensions in an aging, yield stress matrix fluid composed of an aqueous dispersion of Laponite ® clay. Using a custom-built magnetorheometry fixture, the MR response is studied for magnetic field strengths up to 1 T and magnetic particle concentrations up to 30 v%. The yield stress of the matrix fluid, which serves to inhibit sedimentation of dispersed carbonyl iron magnetic microparticles, is found to have a negligible effect on the field-induced static yield stress for sufficient applied fields, and good agreement is observed between field-induced static and dynamic yield stresses for all but the lowest field strengths and particle concentrations. These results, which generally imply a dominance of inter-particle dipolar interactions over the matrix fluid yield stress, are analyzed by considering a dimensionless magnetic yield parameter that quantifies the balance of stresses on particles. By characterizing the applied magnetic field in terms of the average particle magnetization, a rheological master curve is generated for the fieldinduced static yield stress that indicates a concentration-magnetization superposition. The results presented herein will provide guidance to formulators of MR fluids and designers of MR devices who require a field-induced static yield stress and a dispersion that is essentially indefinitely stable to sedimentation.

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Magnetorheological characterization of carbonyl iron based suspension stabilized by fumed silica

Cited by 141 publications

References 8 publications

Developments in Vibration Control of Structures and Structural Components with Magnetorheological Fluids

Developments in Vibration Control of Structures and Structural Components with Magnetorheological Fluids

Study on preparation and thermal conductivity of high stability magnetorheological fluids

Magnetorheology in an aging, yield stress matrix fluid

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