Journal articles: 'Magnetorheological Fluids'

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Bossis, G., S. Lacis, A. Meunier, and O. Volkova. "Magnetorheological fluids." Journal of Magnetism and Magnetic Materials 252 (November 2002): 224–28. http://dx.doi.org/10.1016/s0304-8853(02)00680-7.

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Fuchs, Alan, Abu Rashid, Yanming Liu, Barkan Kavlicoglu, Huseyin Sahin, and Faramarz Gordaninejad. "Compressible magnetorheological fluids." Journal of Applied Polymer Science 115, no. 6 (March 15, 2010): 3348–56. http://dx.doi.org/10.1002/app.31151.

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Rodríguez-Arco, L., M. T. López-López, A. Y. Zubarev, K. Gdula, and J. D. G. Durán. "Inverse magnetorheological fluids." Soft Matter 10, no. 33 (2014): 6256–65. http://dx.doi.org/10.1039/c4sm01103a.

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Shahrivar, Keshvad, and Juan de Vicente. "Thermogelling magnetorheological fluids." Smart Materials and Structures 23, no. 2 (December 23, 2013): 025012. http://dx.doi.org/10.1088/0964-1726/23/2/025012.

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HE, J. M., and J. HUANG. "MAGNETORHEOLOGICAL FLUIDS AND THEIR PROPERTIES." International Journal of Modern Physics B 19, no. 01n03 (January 30, 2005): 593–96. http://dx.doi.org/10.1142/s0217979205029110.

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Magnetorheological (MR) fluids are materials that respond to an applied magnetic field with a change in their rheological properties. Upon application of a magnetic field, MR fluids have a variable yield strength. Altering the strength of the applied magnetic field will control the yield stress of these fluids. In this paper, the method for measuring the yield stress of MR fluids is proposed. The curves between the yield stress of the MR fluid and the applied magnetic field are obtained from the experiment. The result indicates that with the increase of the applied magnetic field the yield stress of the MR fluids goes up rapidly.

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Ginder, John M. "Behavior of Magnetorheological Fluids." MRS Bulletin 23, no. 8 (August 1998): 26–29. http://dx.doi.org/10.1557/s0883769400030785.

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In the absence of an applied magnetic field, magnetorheological (MR) fluids typically behave as nearly ideal Newtonian liquids. The application of a magnetic field induces magnetic dipole and multipole moments on each particle. The anisotropic magnetic forces between pairs of particles promote the head-to-tail alignment of the moments and draws the particles into proximity. These attractive interparticle forces lead to the formation of chains, columns, or more complicated networks of particles aligned with the direction of the magnetic field. When these structures are deformed mechanically, magnetic restoring forces tend to oppose the deformation. Substantial field-dependent enhancements of the rheological properties of these materials result, as demonstrated in Figure 1.The myriad potential applications of MR and electrorheological (ER) fluids provide considerable motivation for research on these materials. The availability of fluids with yield stresses or apparent viscosities that are controllable over many orders of magnitude by applied fields enables the construction of electromechanical devices that are engaged and controlled by electrical signals and that require few or no moving parts. Potential automotive applications include electrically engaged clutches for vehicle powertrains and engine accessories as well as semiactive shock absorbers that can adapt in real time to changing road conditions. Semiactive dampers for rotorcraft control surfaces are among the potential aerospace applications. The critical need to mitigate the structural vibrations of large structures has led to the construction of large, high-force MR-fluid-based dampers. A promising application in manufacturing processes is the computer-aided polishing of precision optics in which abrasive particles are suspended in an MR fluid so that the polishing rate is determined in part by the strength of an applied magnetic field.

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Lucking Bigué, Jean-Philippe, François Charron, and Jean-Sébastien Plante. "Squeeze-strengthening of magnetorheological fluids (part 1): Effect of geometry and fluid composition." Journal of Intelligent Material Systems and Structures 29, no. 1 (May 3, 2017): 62–71. http://dx.doi.org/10.1177/1045389x17705214.

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Recent research has shown that magnetorheological fluid can undergo squeeze-strengthening when flow conditions promote filtration. While a Péclet number has been used to predict filtration in non-magnetic two-phase fluids submitted to slow compression, the approach has yet to be adapted to magnetorheological fluid behavior in order to predict the conditions leading to squeeze-strengthening behavior of magnetorheological fluid. In this article, a Péclet number is derived and adapted to the Bingham rheological model. This Péclet number is then compared to the experimental occurrence of squeeze-strengthening behavior obtained from several squeeze geometries and magnetorheological fluid compositions submitted to pure-squeeze conditions. Results show that the Péclet number well predicts the occurrence of squeeze-strengthening behavior in high-concentration magnetorheological fluid made from various particle sizes and using various squeeze geometries. Moreover, it is shown that squeeze-strengthening occurrence is increased when using annulus geometries or by increasing average particle radius. While lowering concentration increases filtration, tested conditions only led to squeeze-strengthening behavior after concentration had increased close to packing limit. Altogether, results suggest that the Péclet number derived in this study can be used to predict the occurrence of squeeze-strengthening for various magnetorheological fluids and squeeze geometries using the well-known rheological properties of magnetorheological fluids.

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Skalski, Paweł, and Klaudia Kalita. "Role of Magnetorheological Fluids and Elastomers in Today’s World." Acta Mechanica et Automatica 11, no. 4 (December 1, 2017): 267–74. http://dx.doi.org/10.1515/ama-2017-0041.

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AbstractThis paper explains the role of magnetorheological fluids and elastomers in today’s world. A review of applications of magnetorheological fluids and elastomers in devices and machines is presented. Magnetorheological fluids and elastomers belong to the smart materials family. Properties of magnetorheological fluids and elastomers can be controlled by a magnetic field. Compared with magnetorheological fluids, magnetorheological elastomers overcome the problems accompanying applications of MR fluids, such as sedimentation, sealing issues and environmental contamination. Magnetorheological fluids and elastomers, due to their ability of dampening vibrations in the presence of a controlled magnetic field, have great potential present and future applications in transport. Magnetorheological fluids are used e.g. dampers, shock absorbers, clutches and brakes. Magnetorheological dampers and magnetorheological shock absorbers are applied e.g. in damping control, in the operation of buildings and bridges, as well as in damping of high-tension wires. In the automotive industry, new solutions involving magnetorheological elastomer are increasingly patented e.g. adaptive system of energy absorption, system of magnetically dissociable [hooks/detents/grips], an vibration reduction system of the car’s drive shaft. The application of magnetorheological elastomer in the aviation structure is presented as well.

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Phulé, Pradeep P. "Synthesis of Novel Magnetorheological Fluids." MRS Bulletin 23, no. 8 (August 1998): 23–25. http://dx.doi.org/10.1557/s0883769400030773.

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This article focuses on the synthesis and processing of novel magnetorheological (MR) fluids. The process for preparing MR fluids typically involves introducing magnetic particles into base liquid under low shear conditions. This is followed by ball milling in the fluid with zirconia (ZrO2) grinding media for about 24 h. High-purity carbonyi iron (Fe) powders have been used for the synthesis of ironbased MR fluids while the ferrite-based MR fluids used magnetic manganesezinc ferrite and nickel-zinc ferrite powders.Typical volume fractions of the magnetic phase that lead to MR fluids with respectable yield stresses tend to be about 0.3–0.5. Higher volume fractions, in principle, can lead to higher strength MR fluids. However, higher volume fractions tend to cause a significant, and often undesirable, increase in the “off-state” viscosity of the MR fluids. The rationale for selection and the role of different components of MR fluids are briefly discussed in the following sections.

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Wu, Chenjun, Qingxu Zhang, Xinpeng Fan, Yihu Song, and Qiang Zheng. "Smart magnetorheological elastomer peristaltic pump." Journal of Intelligent Material Systems and Structures 30, no. 7 (February 8, 2019): 1084–93. http://dx.doi.org/10.1177/1045389x19828825.

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A smart magnetorheological elastomer peristaltic pump (MRE-PP) realizes controlled movements to convey Newtonian and non-Newtonian fluids under various scheduling policies for electromagnets. Although the structure of the basic element consisted of a magnetorheological elastomer tube and an electromagnet is very succinct, the capability of fluid conveying is dramatically improved when the magnetorheological elastomer peristaltic pump composed of more elements in series is employed. Besides, scheduling policies and the length of the magnetorheological elastomer tube, as another two significant factors, also have remarkable effects on backflow, pumped fluid volume, and viscosity of blood. Various scheduling policies are designed to realize fluid conveying with relatively high pumped volume for non-Newtonian fluid. Meanwhile, low destructiveness is demonstrated in the designed magnetorheological elastomer peristaltic pumps, allowing a potential application of conveying stress sensitive fluids.

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El Wahed, Ali K., and Loaie B. Balkhoyor. "The performance of a smart ball-and-socket actuator applied to upper limb rehabilitation." Journal of Intelligent Material Systems and Structures 29, no. 13 (June 18, 2018): 2811–22. http://dx.doi.org/10.1177/1045389x18780349.

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Magnetorheological fluids are capable of providing continuously variable yield stresses in response to external magnetic fields. Greater potential application in rehabilitation may be realised if these fluids are utilised in controllable actuators offering multi-degree-of-freedom motions. This article presents the results of the comparative performance of a ball-and-socket actuator, employing magnetorheological fluids as the controllable medium, using theoretical and numerical approaches. The theoretical model combines the viscous friction and the controllable field-dependent characteristics of the magnetorheological fluid in which a Bingham plastic model is used to simulate the shear stress of the fluid under various input conditions. A special procedure to simulate the device performance using computational fluid dynamics techniques, which were performed using ANSYS CFX computer code, is detailed. Three commercial magnetorheological fluids (MRF241-ES, MRF132-AD and MRF122-2ED) were assessed and it was found that the simulated values of the device torque compared well with the theoretical values.

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Salwiński, Józef, and Wojciech Horak. "Measurement of Normal Force in Magnetorheological and Ferrofluid Lubricated Bearings." Key Engineering Materials 490 (September 2011): 25–32. http://dx.doi.org/10.4028/www.scientific.net/kem.490.25.

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Preliminary analysis of magnetorheological fluid usability in fluid lubricated bearings has been described in the present study. Results of the study aimed at rheological properties of chosen fluids, which possess magnetic properties (both ferrofluids and magnetorheological fluids) with respect to their application in slide bearings have been presented Preliminary analysis of potential advantages related with the magnetic fluid bearing construction was carried out. Results of measurements of normal force developed within magnetorheological fluid and ferrofluid in result of magnetic field action at various shear rate values have been presented.

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El Wahed, Ali, and Loaie Balkhoyor. "Characteristics of magnetorheological fluids under single and mixed modes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 20 (June 7, 2016): 3798–809. http://dx.doi.org/10.1177/0954406216653621.

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Rheological properties of magnetorheological (MR) fluids can be changed by application of external magnetic fields. These dramatic and reversible field-induced rheological changes permit the construction of many novel electromechanical devices having potential utility in the automotive, aerospace, medical and other fields. Vibration control is regarded as one of the most successful engineering applications of magnetorheological devices, most of which have exploited the variable shear, flow or squeeze characteristics of magnetorheological fluids. These fluids may have even greater potential for applications in vibration control if utilised under a mixed-mode operation. This article presents results of an experimental investigation conducted using magnetorheological fluids operated under dynamic squeeze, shear-flow and mixed modes. A special magnetorheological fluid cell comprising a cylinder, which served as a reservoir for the fluid, and a piston was designed and tested under constant input displacement using a high-strength tensile machine for various magnetic field intensities. Under vertical piston motions, the magnetorheological fluid sandwiched between the parallel circular planes of the cell was subjected to compressive and tensile stresses, whereas the fluid contained within the annular gap was subjected to shear flow stresses. The magnetic field required to energise the fluid was provided by a pair of toroidally shaped coils, located symmetrically about the centerline of the piston and cylinder. This arrangement allows individual and simultaneous control of the fluid contained in the circular and cylindrical fluid gaps; consequently, the squeeze mode, shear-flow mode or mixed-mode operation of the fluid could be activated separately. The performance of these fluids was found to depend on the strain direction. Additionally, the level of transmitted force was found to improve significantly under mixed-mode operation of the fluid.

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Sahin, Huseyin, Faramarz Gordaninejad, Xiaojie Wang, and Yanming Liu. "Response time of magnetorheological fluids and magnetorheological valves under various flow conditions." Journal of Intelligent Material Systems and Structures 23, no. 9 (June 2012): 949–57. http://dx.doi.org/10.1177/1045389x12447984.

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In this study, the response times of magnetorheological fluids and magnetorheological fluid valves are studied under various flow configurations. Two types of valving geometries, annular flow and radial flow, are considered in the magnetorheological fluid valve designs. The transient pressure responses of magnetorheological fluid valves are evaluated using a diaphragm pump with a constant volume flow rate. The performance of each magnetorheological valve is characterized using a voltage step input as well as a current step input while recording the activation electric voltage/current, magnetic flux density, and pressure drop as a function of time. The variation of the response time of the magnetorheological valves under constant volume flow rate is experimentally investigated. The Maxwell model with a time constant is employed to describe the field-induced pressure behavior of magnetorheological fluid under a steady flow. The results demonstrate that the pressure response times of the magnetorheological fluid and the magnetorheological valves depend on the designs of the electric parameters and the valve geometry. Magnetorheological valves with annular flow geometry have a slower falling response time compared to their rising response time. Magnetorheological valves with radial flow geometry demonstrate faster pressure response times both in rising and in falling states.

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Wu, Chenjun, Qingxu Zhang, Xinpeng Fan, Yihu Song, and Qiang Zheng. "Magnetorheological elastomer peristaltic fluid conveying system for non-Newtonian fluids with an analogic moisture loss process." Journal of Intelligent Material Systems and Structures 30, no. 13 (June 4, 2019): 2013–23. http://dx.doi.org/10.1177/1045389x19853625.

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A magnetorheological elastomer peristaltic fluid conveying system consisting of a magnetorheological elastomer tube and two electromagnets implements controlled movements via an external magnetic field with varying periods of driving voltages to convey non-Newtonian fluids over a certain time period. The effects of backpressure at the outlet of the magnetorheological elastomer peristaltic fluid conveying system, the viscosity of fluids at zero shear rate, and moisture loss along the longitudinal direction on net pumped volume are investigated systematically. The results demonstrate that the net pumped volume declines linearly with backpressure under all driving voltage periods. An improvement of the viscosity of fluids at zero shear rate allows at first the decrease, then the increase, and finally the decrease of the net pumped volume. Moisture loss plays a second role in the net pumped volume and the change of the fluid viscosity profile. The compression of the magnetorheological elastomer tube, the maximum shear stress, and the maximum von Mises stress in the magnetorheological elastomer peristaltic fluid conveying system are investigated to evaluate the magneto-fluid-structure interaction. This research offers a new approach to biological fluid conveying with an analogic moisture loss process.

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Vékás, Ladislau. "Ferrofluids and Magnetorheological Fluids." Advances in Science and Technology 54 (September 2008): 127–36. http://dx.doi.org/10.4028/www.scientific.net/ast.54.127.

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Composition, synthesis and structural properties of ferrofluids and magnetorheological fluids are reviewed and compared. The similarities and main differences between the two types of magnetically controllable fluids are outlined and exemplified in the paper. Chemical synthesis and structural characterization of magnetizable fluids for engineering and biomedical applications are thoroughly discussed.

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de Vicente, Juan, Daniel J. Klingenberg, and Roque Hidalgo-Alvarez. "Magnetorheological fluids: a review." Soft Matter 7, no. 8 (2011): 3701. http://dx.doi.org/10.1039/c0sm01221a.

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Lange, U., L. Richter, and L. Zipser. "Flow of Magnetorheological Fluids." Journal of Intelligent Material Systems and Structures 12, no. 3 (March 2001): 161–64. http://dx.doi.org/10.1106/pf05-dtu2-2qtd-28b6.

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Tao, R. "Super-strong magnetorheological fluids." Journal of Physics: Condensed Matter 13, no. 50 (November 30, 2001): R979—R999. http://dx.doi.org/10.1088/0953-8984/13/50/202.

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Mazlan, Saiful Amri, Ahmed Issa, and Abdul Ghani Olabi. "Magnetorheological Fluids Behaviour in Tension Loading Mode." Advanced Materials Research 47-50 (June 2008): 242–45. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.242.

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In this paper, the behaviours of three types of MR fluids under quasi-static loadings in tension mode were investigated. One type of water-based and two types of hydrocarbon-based MR fluids were activated by a magnetic field generated by a coil using a constant value of DC electrical current. Experimental results in terms of stress-strain relationships showed that the MR fluids had distinct unique behaviours during the tension process. A high ratio of solid particles to carrier liquid in the MR fluid is an indication of high magnetic properties. The water-based MR fluid had a relatively large solid-to-liquid ratio. At a given applied current, a significant increase in tensile stress was obtained in this fluid type. On the other hand, the hydrocarbon-based MR fluids had relatively lower solid to liquid ratios, whereby, less increases in tensile stress were obtained. The behaviours of MR fluids were dependent on the relative movement between the solid magnetic particles and the carrier fluid. A complication occurs because, in the presence of a magnetic field, there will be a tendency of the carrier fluid to stick with the magnetic particle

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Zschunke, F., R. Rivas, and P. O. Brunn. "Temperature Behavior of Magnetorheological Fluids." Applied Rheology 15, no. 2 (April 1, 2005): 116–21. http://dx.doi.org/10.1515/arh-2005-0007.

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AbstractMagnetorheological fluids (MRFs) show a high but reversible rise of the viscosity upon application of an external magnetic field. This effect can be utilized in controllable friction dampers where the MR fluid flows through a gap with a adjustable magnetic field. The change in the magnitude of the magnetic field leads to a change of the viscosity of the fluid which in turn effects the pressure drop in the system. So the damping force can be controlled by the magnitude of the external magnetic field. This energy dissipation leads to a rise of the damper temperature. For designing those dampers it is vital to know the influence of the geometry, which influences the magnetic field strength, as well as the flow properties and the temperature dependence of the magnetorheological effect. An approach to the solution of this problem is shown by using an Arrhenius relationship, where the fluid viscosity is a function of the shear rate, the magnetic field and the temperature. The aim of the here presented research is to show how the fluid behavior can be simply modeled for use in CFD codes to design dampers or other applications.

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Elsaady, Wael, S. Olutunde Oyadiji, and Adel Nasser. "A review on multi-physics numerical modelling in different applications of magnetorheological fluids." Journal of Intelligent Material Systems and Structures 31, no. 16 (July 7, 2020): 1855–97. http://dx.doi.org/10.1177/1045389x20935632.

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Magnetorheological fluids involve multi-physics phenomena which are manifested by interactions between structural mechanics, electromagnetism and rheological fluid flow. In comparison with analytical models, numerical models employed for magnetorheological fluid applications are thought to be more advantageous, as they can predict more phenomena, more parameters of design, and involve fewer model assumptions. On that basis, the state-of-the-art numerical methods that investigate the multi-physics behaviour of magnetorheological fluids in different applications are reviewed in this article. Theories, characteristics, limitations and considerations employed in numerical models are discussed. Modelling of magnetic field has been found to be rather an uncomplicated affair in comparison to modelling of fluid flow field which is rather complicated. This is because, the former involves essentially one phenomenon/mechanism, whereas the latter involves a plethora of phenomena/mechanisms such as laminar versus turbulent rheological flow, incompressible versus compressible flow, and single- versus two-phase flow. Moreover, some models are shown to be still incapable of predicting the rheological nonlinear behaviour of magnetorheological fluids although they can predict the dynamic characteristics of the system.

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Wang, Dongdong, Xinhua Liu, Lifeng Wang, Yankun Ren, and Qiuxiang Zhang. "Study on the Saturation Properties of Silicone Oil-Based Magnetorheological Fluids in Mechanical Engineering." Open Mechanical Engineering Journal 9, no. 1 (September 17, 2015): 682–86. http://dx.doi.org/10.2174/1874155x01509010682.

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In this paper some saturation properties of silicone oil-based magnetorheological fluids in mechanical engineering were researched and discussed by theoretical analysis and experiments. Firstly, experiment materials and preparation process of silicone oil-based magnetorheological fluids were presented. Secondly, magnetic-field saturation, particles saturation and added nano-particles saturation were elaborated. Finally, the influence of these properties on magnetorheological fluids properties were discussed to provide references for parameter design of magnetorheological fluids preparation and mechanical engineering.

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ROSENFELD, NICHOLAS, NORMAN M. WERELEY, RADHAKUMAR RADAKRISHNAN, and TIRULAI S. SUDARSHAN. "BEHAVIOR OF MAGNETORHEOLOGICAL FLUIDS UTILIZING NANOPOWDER IRON." International Journal of Modern Physics B 16, no. 17n18 (July 20, 2002): 2392–98. http://dx.doi.org/10.1142/s0217979202012414.

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Iron nanopowders for use in magnetorheological (MR) fluids were synthesized using a Microwave Plasma Synthesis technique developed at Materials Modification Inc (Fairfax VA). Transmission electron microscopy and surface area analysis measured iron particle size at 15–25 nm. The nanopowders were mixed into hydraulic oil to create nano-scale MR fluid. A micro-scale fluid was created using 45 μm iron particles as well as a hybrid fluid using a 50/50 mix of micro- and nanoparticles. All three fluids had a solids loading of 60% (w/w or weight by weight fraction). The fluids were tested in a flow mode rheometer fabricated from a modified damper using a sinusoidal input dynamometer over a speed range of 12.7 to 177.8 mm/s (0.5 to 6 in/s) and an input current range of 0 to 2 A. The yield stress and plastic viscosity of the MR fluid were characterized using a Bingham plastic model.

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Wang, Hong Yun, and Hui Qiang Zheng. "Shear and Squeeze Rheometry of Magnetorheological Fluids." Advanced Materials Research 305 (July 2011): 344–47. http://dx.doi.org/10.4028/www.scientific.net/amr.305.344.

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The mechanical properties of a magnetorheological (MR) fluid in shearing, compression and shearing after compression have been studied in the magnetic field which is generated by a coil carrying different magnitudes of DC electrical current on a self-constructed test system. The relations of compression stress versus compression strain, yield stress versus compression stress were studied under different magnetic fields. The compressing tests showed that the MR fluid is very stiff at small compressive strains lower than 0.13. The shear yield stress of MR fluids after compression was much stronger than that of uncompressed MR fluids under the same magnetic field. The enhanced shear yield stress of MR fluids can be utilized to design the MR clutch and brake for new structure and will make MR fluids technology attractive for many applications.

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Zhang, Xinjie, Ruochen Wu, Konghui Guo, Piyong Zu, and Mehdi Ahmadian. "Dynamic characteristics of magnetorheological fluid squeeze flow considering wall slip and inertia." Journal of Intelligent Material Systems and Structures 31, no. 2 (December 5, 2019): 229–42. http://dx.doi.org/10.1177/1045389x19888781.

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Magnetorheological fluid has been investigated intensively nowadays, and magnetorheological fluid shows large force capabilities in squeeze mode with wide application potential such as control valve, engine mounts, and impact dampers. In these applications, magnetorheological fluid is flowing in a dynamic environment due to the transient nature of inputs and system characteristics. Hence, this article undertakes a comprehensive study of magnetorheological fluid squeeze flow dynamics behaviors with wall slip, yield, and inertia. First, the dynamic model with the bi-viscous constitutive of magnetorheological fluid squeeze flow including wall slip and inertial force is presented. Then, the mathematical model is validated, matching magnetorheological fluid squeeze dynamic test results very well. Finally, the dynamics behavior and mechanism of magnetorheological fluid squeeze flow with inertia, yield, and wall slip are explored. Results show that (1) increasing yield stress and decreasing initial gap will increase the magnetorheological fluid vertical force greatly; (2) the wall slip affects the yield surface of magnetorheological fluids in the squeeze zone and affects the squeeze force; (3) the inertial force is increasing tremendously as the increased excitation frequency and yield stress and should be included with high-frequency excitation or yield stress.

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Hong, Kwang Pyo, Ki Hyeok Song, Myeong Woo Cho, Seung Hyuk Kwon, and Hyoung Jin Choi. "Magnetorheological properties and polishing characteristics of silica-coated carbonyl iron magnetorheological fluid." Journal of Intelligent Material Systems and Structures 29, no. 1 (October 16, 2017): 137–46. http://dx.doi.org/10.1177/1045389x17730912.

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While magnetorheological fluids can be used for ultra-precise polishing, for example, of advanced optical components, oxidation of metallic particles in water-based magnetorheological fluids causes irregular polishing behavior. In this study, carbonyl iron microspheres were initially coated with silica to prevent oxidation and were used to polish BK7 glass. In addition, their rheological and sedimentation characterizations were investigated. Material removal and surface roughness were analyzed to investigate the surface quality and optimal experimental conditions of polishing wheel speed and magnetic field intensity. The maximum material removal was 0.95 µm at 95.52 kA/m magnetic field intensity and 1854 mm/s wheel speed. A very fine surface roughness of 0.87 nm was achieved using the silica-coated magnetorheological fluid at 47.76 kA/m magnetic field intensity and 1854 mm/s wheel speed.

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Browne, Alan L., Joseph D. Mccleary, Chandra S. Namuduri, and Scott R. Webb. "Impact Performance of Magnetorheological Fluids." Journal of Intelligent Material Systems and Structures 20, no. 6 (September 22, 2008): 723–28. http://dx.doi.org/10.1177/1045389x08096358.

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Gorodkin, S., R. James, and W. Kordonski. "Irreversible Effects in Magnetorheological Fluids." Journal of Intelligent Material Systems and Structures 22, no. 15 (October 2011): 1749–54. http://dx.doi.org/10.1177/1045389x11426180.

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Fratantonio, Frank, Thomas R. Howarth, Jeffrey E. Boisvert, Anthony Bruno, Clyde L. Scandrett, and William M. Wynn. "Acoustic characterization of magnetorheological fluids." Journal of the Acoustical Society of America 128, no. 4 (October 2010): 2457. http://dx.doi.org/10.1121/1.3508795.

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LI, W. H., G. CHEN, S. H. YEO, and H. DU. "STRESS RELAXATION OF MAGNETORHEOLOGICAL FLUIDS." International Journal of Modern Physics B 16, no. 17n18 (July 20, 2002): 2655–61. http://dx.doi.org/10.1142/s0217979202012803.

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In this paper, the experimental and modeling study and analysis of the stress relaxation characteristics of magnetorheological (MR) fluids under step shear are presented. The experiments are carried out using a rheometer with parallel-plate geometry. The applied strain varies from 0.01% to 100%, covering both the pre-yield and post-yield regimes. The effects of step strain, field strength, and temperature on the stress modulus are addressed. For small step strain ranges, the stress relaxation modulus G(t,γ) is independent of step strain, where MR fluids behave as linear viscoelastic solids. For large step strain ranges, the stress relaxation modulus decreases gradually with increasing step strain. Morever, the stress relaxation modulus G(t,γ) was found to obey time-strain factorability. That is, G(t,γ) can be represented as the product of a linear stress relaxation G(t) and a strain-dependent damping function h(γ). The linear stress relaxation modulus is represented as a three-parameter solid viscoelastic model, and the damping function h(γ) has a sigmoidal form with two parameters. The comparison between the experimental results and the model-predicted values indicates that this model can accurately describe the relaxation behavior of MR fluids under step strains.

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KITTIPOOMWONG, DAVID, DANIEL J. KLINGENBERG, and JOHN C. ULICNY. "SIMULATION OF BIDISPERSE MAGNETORHEOLOGICAL FLUIDS." International Journal of Modern Physics B 16, no. 17n18 (July 20, 2002): 2732–38. http://dx.doi.org/10.1142/s0217979202012918.

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A method for simulating the steady-shear behavior of bidisperse, nonlinearly magnetizable MR suspensions is described. Results show that the yield stress of suspensions containing mixtures of large and small particles is larger than that of monodisperse suspensions, in agreement with previous experimental results.

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Zhou, Lei, Weijia Wen, and Ping Sheng. "Ground States of Magnetorheological Fluids." Physical Review Letters 81, no. 7 (August 17, 1998): 1509–12. http://dx.doi.org/10.1103/physrevlett.81.1509.

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Li, W. H., H. Du, N. Q. Guo, and P. B. Kosasih. "Magnetorheological fluids based haptic device." Sensor Review 24, no. 1 (March 2004): 68–73. http://dx.doi.org/10.1108/02602280410515842.

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Odenbach, Stefan, and Dmitry Borin. "Electrorheological fluids and magnetorheological suspensions." Journal of Physics: Condensed Matter 22, no. 32 (July 14, 2010): 320301. http://dx.doi.org/10.1088/0953-8984/22/32/320301.

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Rodríguez-López, J., L. Elvira, P. Resa, and F. Montero de Espinosa. "Sound attenuation in magnetorheological fluids." Journal of Physics D: Applied Physics 46, no. 6 (January 10, 2013): 065001. http://dx.doi.org/10.1088/0022-3727/46/6/065001.

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Genç, Seval, and Pradeep P. Phulé. "Rheological properties of magnetorheological fluids." Smart Materials and Structures 11, no. 1 (February 8, 2002): 140–46. http://dx.doi.org/10.1088/0964-1726/11/1/316.

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Brigadnov, I. A., and A. Dorfmann. "Mathematical modeling of magnetorheological fluids." Continuum Mechanics and Thermodynamics 17, no. 1 (April 2005): 29–42. http://dx.doi.org/10.1007/s00161-004-0185-1.

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Kordonskii, V. I., S. A. Demchuk, and V. A. Kuz’min. "Viscoelastic properties of magnetorheological fluids." Journal of Engineering Physics and Thermophysics 72, no. 5 (September 1999): 841–44. http://dx.doi.org/10.1007/bf02699403.

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40

Laun, H. Martin, Claudius Kormann, and Norbert Willenbacher. "Rheometry on magnetorheological (MR) fluids." Rheologica Acta 35, no. 5 (1996): 417–32. http://dx.doi.org/10.1007/bf00368993.

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41

Claracq, J�r�me, J�r�me Sarrazin, and Jean-Pierre Montfort. "Viscoelastic properties of magnetorheological fluids." Rheologica Acta 43, no. 1 (February 1, 2004): 38–49. http://dx.doi.org/10.1007/s00397-003-0318-7.

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42

Golinelli, Nicola, and Andrea Spaggiari. "Experimental validation of a novel magnetorheological damper with an internal pressure control." Journal of Intelligent Material Systems and Structures 28, no. 18 (February 1, 2017): 2489–99. http://dx.doi.org/10.1177/1045389x17689932.

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In the present article, we have investigated the behaviour of magnetorheological fluids under a hydrostatic pressure of up to 40 bar.We have designed, manufactured and tested a magnetorheological damper with a novel architecture, which provides the control of the internal pressure. The pressurewas regulated by means of an additional apparatus connected to the damper that acts on the fluid volume. The magnetorheological damper was tested under sinusoidal inputs and with several values for the magnetic field and internal pressure. The results show that the new architecture is able to work without a volume compensator and bear high pressures. On the one hand, the influence of the hydrostatic pressure on the yield stress of the magnetorheological fluids is not strong, probably because the ferromagnetic particles cannot arrange themselves into thicker columns. On the other hand, the benefits of the pressure on the behaviour of the magnetorheological damper are useful in terms of preventing cavitation.

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43

Choi, Young-Tai, Norman M. Wereley, and Young-Sik Jeon. "Semi-Active Isolators Using Electrorheological/Magnetorheological Fluids." Noise & Vibration Worldwide 33, no. 11 (December 2002): 16–19. http://dx.doi.org/10.1260/09574560260459657.

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ER (electrorheological)/MR (magnetorheological) fluids are colloidal suspensions that can control their rheological properties such as viscosity and yield stress in response to external signal. As a result, applications using ER/MR fluids have useful features such as fast response time and continuous control ability. These kinds of inherent advantages of ER/MR fluids trigger a lot of research activities on ER/MR applications including controllable vibration isolation systems, torque-transmission devices, and others. Among them, semi-active ER/MR fluid-based vibration isolators will be studied in this paper. The semi-active isolators can effectively isolate systems from various external disturbances with low power consumption, so that the system should not expose to significant dynamic stress and fatigue damage.

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TANG, X., X. ZHANG, and R. TAO. "Enhance the Yield Shear Stress of Magnetorheological Fluids." International Journal of Modern Physics B 15, no. 06n07 (March 20, 2001): 549–56. http://dx.doi.org/10.1142/s0217979201005003.

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To enhance the yield shear stress of magnetorheological (MR) fluids is an important task. Since thick columns have a yield stress much higher than a single-chain structure, we enhance the yield stress of an MR fluids by changing the microstructure of MR fluids. Immediately after a magnetic field is applied, we compress the MR fluid along the field direction. SEM images show that the particle chains are pushed together to form thick columns. The shear force measured after the compression indicates that the yield stress can reach as high as 800 kPa under a moderate magnetic field, while the same MR fluid has a yield stress of 80 kPa without compression. This enhanced yield stress increases with the magnetic field and compression pressure and has an upper limit well above 800 kPa. The method is also applicable to electrorheological fluids.

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Heo, Yong Hae, Dong-Soo Choi, In-Ho Yun, and Sang-Youn Kim. "A Tiny Haptic Knob Based on Magnetorheological Fluids." Applied Sciences 10, no. 15 (July 25, 2020): 5118. http://dx.doi.org/10.3390/app10155118.

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In this paper, we propose a tiny haptic knob that creates torque feedback in consumer electronic devices. To develop the proposed haptic knob, we use a magnetorheological (MR) fluid. When an input current is applied to a solenoid coil, a magnetic field causes a change in the MR fluid’s viscosity. This change allows the proposed haptic knob to generate a resistive torque. We optimize the structure of the haptic knob, in which two operating modes of MR fluids contribute to the actuation simultaneously. We conduct magnetic path simulation and resistive torque simulation using the finite element method and perform experiments to measure the resistive torque and its torque rate according to the rotational speed and applied current. The results show that the proposed haptic knob generates sufficient torque feedback to stimulate users and creates a variety of haptic sensations.

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Kostrov, S. A., P. A. Tikhonov, A. M. Muzafarov, and E. Yu Kramarenko. "Magnetorheological Fluids Based on Star-Shaped and Linear Polydimethylsiloxanes." Polymer Science, Series A 63, no. 3 (April 27, 2021): 296–306. http://dx.doi.org/10.1134/s0965545x2103007x.

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Abstract Magnetorheological fluids are obtained on the basis of star-shaped and linear PDMS containing 70, 75, and 80 wt % of carbonyl iron microparticles. While pure PDMS polymers are Newtonian fluids, composites exhibit pseudoplasticity. The viscoelastic properties of the obtained magnetorheological fluids of different composition are studied in magnetic fields up to 1 T. The viscosity and storage modulus of the magnetorheological fluids in the maximum magnetic field reach ~0.19–0.65 MPa s and 0.4 MPa, respectively. The relative increase in the viscosity and storage modulus of the magnetorheological fluids based on the star-shaped PDMS with a magnetic filler concentration of 70 wt % in a magnetic field exceeds four orders of magnitude. In the magnetic field, the yield stress of the magnetic composites is as high as 70 kPa at a magnetic field strength of 1 T.

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Vannarth, Ram Rohit, Raj Dhake, S. Vishal Kanna, and Safal Sharad Saraf. "Characterisation of Natural Oils as Carrier Fluids for Magnetorheological Fluids." International Journal of Engineering Materials and Manufacture 4, no. 4 (December 11, 2019): 164–69. http://dx.doi.org/10.26776/ijemm.04.04.2019.04.

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The field of application of Magnetorheological fluids (MRF) is widening. The carrier fluids being used now are synthetic, expensive and non-biodegradable. Hence, there is a need for looking for better and inexpensive alternatives. This study was intended to uncloak alternatives to the synthetic carrier fluids by taking four natural oils and conducting various tests. The four natural oils, viz, Simarouba Oil, Mahua Oil, Groundnut oil, Flaxseed oil and synthetic Silicone oil were taken and tests concerning Magnetorheological fluids like density, kinematic viscosity, flash and fire point, pour point, etc., were conducted according to standards in a licensed laboratory. Based on the various tests conducted, the four natural oils have shown remarkable potential compared with commonly used silicone oil to be used as carrier fluids.

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Lloyd, John R., Miquel O. Hayesmichel, and Clark J. Radcliffe. "Internal Organizational Measurement for Control of Magnetorheological Fluid Properties." Journal of Fluids Engineering 129, no. 4 (November 21, 2006): 423–28. http://dx.doi.org/10.1115/1.2436588.

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Magnetorheological (MR) fluids change their physical properties when subjected to a magnetic field. As this change occurs, the specific values of the physical properties are a function of the fluid’s time-varying organization state. This results in a nonlinear, hysteretic, time-varying fluid property response to direct magnetic field excitation. Permeability, resistivity and permittivity changes of MR fluid were investigated and their suitability to indicate the organizational state of the fluid, and thus other transport properties, was determined. High sensitivity of permittivity and resistivity to particle organization and applied field was studied experimentally. The measurable effect of these material properties can be used to implement an MR fluid state sensor.

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Liu, Xinhua, Hao Liu, and Yongzhi Liu. "Simulation of Magnetorheological Fluids Based on Lattice Boltzmann Method with Double Meshes." Journal of Applied Mathematics 2012 (2012): 1–16. http://dx.doi.org/10.1155/2012/567208.

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In order to study the rheological characteristics of magnetorheological fluids, a novel approach based on the two-component Lattice Boltzmann method with double meshes was proposed, and the micro-scale structures of magnetorheological fluids in different strength magnetic fields were simulated. The framework composed of three steps for the simulation of magnetorheological fluids was addressed, and the double meshes method was elaborated. Moreover, the various internal and external forces acting on the magnetic particles were analyzed and calculated. The two-component Lattice Boltzmann model was set up, and the flowchart for the simulation of magnetorheological fluids based on the two-component Lattice Boltzmann method with double meshes was designed. Finally, a physics experiment was carried out, and the simulation examples were provided. The comparison results indicated that the proposed approach was feasible, efficient, and outperforming others.

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Fu, Benyuan, Changrong Liao, Zhuqiang Li, Lei Xie, Xiaochun Jian, and Chunzhi Liu. "Effective design strategy for a high-viscosity magnetorheological fluid–based energy absorber with multi-stage radial flow mode." Journal of Intelligent Material Systems and Structures 30, no. 1 (November 6, 2018): 127–39. http://dx.doi.org/10.1177/1045389x18803460.

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High-viscosity linear polysiloxane–based magnetorheological fluid features its excellent suspension stability. Few reports could be found for magnetorheological energy absorbers using such highly viscous but highly stable magnetorheological fluids as the controlled medium. This study presents a design strategy for the high-viscosity linear polysiloxane–based magnetorheological fluid–based magnetorheological energy absorber with multi-stage radial flow mode. The design strategy is based on the Herschel–Bulkley flow model incorporating minor losses proposed in our prior work. The optimal geometrical parameters were obtained by gradually reducing the number of unknown variables. By analyzing the effect of thicknesses of baffle and outer cylinder and number of coil turns on magnetic circuit, the distribution of magnetic flux in the effective region of magnetorheological valve was optimized. Furthermore, a magnetorheological energy absorber was fabricated and tested using a high-speed drop tower facility with a 600 kg mass. The maximum nominal impact velocity was 4.2 m/s, and the applied current varied discretely from 0, 1, 2, to 3 A. Comparison of our Herschel–Bulkley flow model with measured data was conducted via analysis of peak force, dynamic range, and maximum displacement that indicate the performance of magnetorheological energy absorber. The results validated the effectiveness of the design strategy for the high-viscosity linear polysiloxane–based magnetorheological fluid–based magnetorheological energy absorber.

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Journal articles on the topic 'Magnetorheological Fluids'

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