Journal articles: 'Magnetorheological effect'

1

Lokander, M., and B. Stenberg. "Improving the magnetorheological effect in isotropic magnetorheological rubber materials." Polymer Testing 22, no. 6 (2003): 677–80. http://dx.doi.org/10.1016/s0142-9418(02)00175-7.

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Dong, X., N. Ma, J. Ou, and M. Qi. "Predicating magnetorheological effect of magnetorheological elastomers under normal pressure." Journal of Physics: Conference Series 412 (February 15, 2013): 012035. http://dx.doi.org/10.1088/1742-6596/412/1/012035.

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McKee, Michael, Faramarz Gordaninejad, and Xiaojie Wang. "Effects of temperature on performance of compressible magnetorheological fluid suspension systems." Journal of Intelligent Material Systems and Structures 29, no. 1 (2017): 41–51. http://dx.doi.org/10.1177/1045389x17705203.

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The temperature effect on performance of compressible magnetorheological fluid suspension systems is studied. Magnetorheological fluid is a temperature-dependent material where its compressibility and rheological properties change with temperature. Experimental studies were conducted to explore the temperature effects on the properties of the magnetorheological fluid and the compressible magnetorheological fluid suspension systems. The temperature effect on magnetorheological fluid properties included the bulk modulus, shear yield stress, and viscosity. It was found that the shear yield stress of the magnetorheological fluid remains unchanged within the testing range while both the plastic viscosity, using the Bingham plastic model, and the bulk modulus of the magnetorheological fluid decrease as the temperature of the fluid increases. A theoretical model that incorporates the temperature-dependent properties of magnetorheological fluid was developed to predict behavior of a compressible magnetorheological fluid suspension system. An experimental study was conducted using an annular flow compressible magnetorheological fluid suspension system with varying temperatures, motion frequencies, and magnetic fields. The experimental results are used to verify the theoretical model. Moreover, the stiffness and energy dissipation of the compressible magnetorheological fluid suspension system were obtained, experimentally. The effects of the temperature on performance characteristics of the compressible magnetorheological fluid suspension system were analyzed. It was found that both the stiffness and the energy dissipation decrease with an increase in the temperature of magnetorheological fluid.

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Yarra, Siddaiah, Faramarz Gordaninejad, Majid Behrooz, and Gokhan Pekcan. "Performance of natural rubber and silicone-based magnetorheological elastomers under large-strain combined axial and shear loading." Journal of Intelligent Material Systems and Structures 30, no. 2 (2018): 228–42. http://dx.doi.org/10.1177/1045389x18808393.

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This study presents an experimental investigation on large-strain behavior of natural rubber– and silicone-based magnetorheological elastomers within a larger scope of structural vibration mitigation due to wind, traffic and seismic events. Magnetorheological elastomer samples with different weight percentages of iron particles, additives, and elastomer matrix were fabricated. The microstructures of specimens were examined, and their mechanical properties were investigated by a unique electromagnetic double-lap shear experimental setup capable of applying simultaneous compression and shear loads. The experimental results demonstrated that the isotropic natural rubber–based magnetorheological elastomers exhibit about 30% magnetorheological effect under large strains, while they achieve a higher magnetorheological effect under the combined axial and shear loading. The magnetorheological effect was 92% and 33% for 10% and 100% shear strains when 100 psi axial stress was applied. A natural rubber–based magnetorheological elastomer was further investigated applying dynamic cyclic load with and without compression load for different strains, frequencies, and magnetic field intensities. It was observed that for higher frequency, magnetorheological effect was reduced. Magnetorheological effects were 73% and 29% for 0.1 and 10 Hz frequencies, respectively, under 100 psi axial stress at 150% shear strain. The result of this study suggests that isotropic natural rubber–based magnetorheological elastomers may be suitable for high-demand-force applications, and in particular, in civil structures.

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Song, Xincheng, Wenju Wang, Fufeng Yang, Guoping Wang, and Xiaoting Rui. "The study of enhancement of magnetorheological effect based on natural rubber/thermoplastic elastomer SEBS hybrid matrix." Journal of Intelligent Material Systems and Structures 31, no. 3 (2019): 339–48. http://dx.doi.org/10.1177/1045389x19888790.

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Magnetorheological elastomers are one kind of smart materials which consist of matrix materials and magnetic particles. The mechanical properties of magnetorheological elastomers were controllable under an external magnetic field. Applications of magnetorheological elastomers are limited as a result of their poor magnetorheological effect and mechanical performance, so enhancing the magnetorheological effect of them is critical for their application. Styrene-ethylene-butylene-styrene based thermoplastic elastomer was added to natural rubber to fabricate hybrid matrix–based magnetorheological elastomers. Zero modulus of magnetorheological elastomers increased from 0.50 to 0.64 MPa and magnetorheological effect increased from 28.00% to 43.75% with the addition of styrene-ethylene-butylene-styrene based thermoplastic elastomer. The contact angle of carbonyl iron particles with the matrix showed that styrene-ethylene-butylene-styrene based thermoplastic elastomer can improve the compatibility of carbonyl iron particles with the matrix. Fourier-transform infrared spectroscopy analysis has been carried out to investigate the internal structure of hybrid matrix–based magnetorheological elastomers.

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Yarra, Siddaiah, Faramarz Gordaninejad, Majid Behrooz, Gokhan Pekcan, Ahmad M. Itani, and Nelson Publicover. "Performance of a large-scale magnetorheological elastomer–based vibration isolator for highway bridges." Journal of Intelligent Material Systems and Structures 29, no. 20 (2018): 3890–901. http://dx.doi.org/10.1177/1045389x18799493.

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This study presents an experimental investigation on the magnetorheological effect of a new magnetorheological elastomer–based adaptive bridge isolation bearing system. Two identical magnetorheological elastomer–based adaptive bridge bearings (isolators) were designed and fabricated. Electromagnets were incorporated to create a closed-loop magnetic path in the magnetorheological elastomer layers. A double-lap shear and compression test setup was utilized to characterize the mechanical properties of the system subjected to scaled structural cyclic forces and strains. Experimental results demonstrated that the effective stiffness of adaptive bridge bearings increases with increased applied magnetic field and a compressive force resulted in larger apparent shear stiffness. Also, increasing loading frequency resulted in larger apparent shear stiffness and lower magnetorheological effect and similarly, however, a compressive force resulted in smaller magnetorheological effects.

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7

Peng, Yongbo, Jinggui Yang, and Jie Li. "Parameter identification of modified Bouc–Wen model and analysis of size effect of magnetorheological dampers." Journal of Intelligent Material Systems and Structures 29, no. 7 (2017): 1464–80. http://dx.doi.org/10.1177/1045389x17740963.

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Magnetorheological damper is one of the most promising smart devices for vibration mitigation of structures subjected to dynamic loads. In order to fulfill the value of magnetorheological damping control, a feasible mechanical model of magnetorheological dampers with simplicity and sufficient accuracy is usually required in practice. It comes up, however, with a challenging issue for the modeling of large-size magnetorheological dampers due to physical constraints on the performance test. The large-size magnetorheological damper is typically modeled in up-scaling parameters associated with models of the small-size magnetorheological damper. This treatment remains open since a size effect hinges upon the intrinsic non-linearity inherent in the device. In this article, a dynamic test of a small-size magnetorheological damper is performed first. The relevance of damper force with the input current and excitation frequency is well revealed. The modified Bouc–Wen model is employed to logically represent the dynamic behaviors of magnetorheological dampers. Identification of model parameters in typical loading cases is then proceeded, of which the functional relationship against input current is established. The size effect of magnetorheological dampers is further addressed through investigating the functional relationship relevant to maximum outputs of 200, 10, and 5 kN. It is indicated that the small-size magnetorheological damper needs more number of control parameters than the large-size magnetorheological damper. Moreover, a linear current relevance of model parameters appears in the small-size magnetorheological damper, while a quadratic current relevance of model parameters appears in the large-size magnetorheological damper. Size effect of magnetorheological dampers arises to be well-marked in the range of low current and becomes unapparent in the range of high current. Besides, the validation of modified Bouc–Wen model is carried out that reveals the applicability of the model with case-optimized parameters.

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Bastola, AK, M. Paudel, and L. Li. "Line-patterned hybrid magnetorheological elastomer developed by 3D printing." Journal of Intelligent Material Systems and Structures 31, no. 3 (2019): 377–88. http://dx.doi.org/10.1177/1045389x19891557.

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This article presents the development of line-patterned magnetorheological elastomers via 3D printing and their magnetorheological characterization. Herein, we consider five different patterns of magnetorheological fluid filaments that are printed and encapsulated within the elastomer matrix. The 3D-printed magnetorheological elastomers could represent the conventional isotropic and anisotropic magnetorheological elastomers. First, the effect of patterning the magnetorheological fluid filaments and the effect of change in the direction of the magnetic field is studied for all five patterns. Thereafter, the dynamic properties of 3D-printed magnetorheological elastomers under uniaxial deformation are presented. Magnetorheological effect shown by 3D-printed magnetorheological elastomers was found to be depended on the printed patterns as well as the direction of the applied magnetic field. This result showed that the 3D printing method has the potential to produce anisotropic magnetorheological elastomers or unique configuration of magnetic particles within the elastomer matrix. The dynamic testing showed that the storage modulus of 3D-printed magnetorheological elastomers is increased with increasing frequency and decreased with increasing strain amplitude, which signifies that the 3D-printed hybrid magnetorheological elastomers are also viscoelastic materials and the properties are magnetic field dependent as that of current magnetorheological elastomers.

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9

PAN, Jisheng. "Cluster Magnetorheological Effect Plane PolishingTechnology." Journal of Mechanical Engineering 50, no. 1 (2014): 205. http://dx.doi.org/10.3901/jme.2014.01.205.

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10

Guan, Xinchun, Xufeng Dong, and Jinping Ou. "Magnetostrictive effect of magnetorheological elastomer." Journal of Magnetism and Magnetic Materials 320, no. 3-4 (2008): 158–63. http://dx.doi.org/10.1016/j.jmmm.2007.05.043.

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11

Kolekar, Shreedhar, R. V. Kurahatti, Vikram G. Kamble, Amol B. Kharage, and Seung-Bok Choi. "Frictional Effect on Magnetorheological Fluid." Advanced Science, Engineering and Medicine 11, no. 5 (2019): 367–74. http://dx.doi.org/10.1166/asem.2019.2361.

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12

Fereidooni, Amin, Afonso Martins, Viresh Wickramasinghe, and Afzal Suleman. "Fabrication and characterization of highly controllable magnetorheological material in compression mode." Journal of Intelligent Material Systems and Structures 31, no. 14 (2020): 1641–61. http://dx.doi.org/10.1177/1045389x20930081.

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This article is focused on the development and characterization of highly controllable magnetorheological materials for stiffness and damping control in semi-active control applications. Two types of magnetorheological materials are developed in-house: magnetorheological elastomer with soft base elastomer, and magnetorheological fluid encapsulated in regular elastomer, namely magnetorheological fluid-elastomer. In both cases of magnetorheological elastomers and magnetorheological fluid-elastomers, the samples are evaluated using in-house-developed shear and compression test rigs, which are equipped with electromagnets and Hall effect sensors for measuring the magnetic field. These features provide the capability to precisely control a wide range of magnetic fields during the experiments. In the case of magnetorheological elastomers, the experimental results of the in-house magnetorheological elastomers are compared with commercially available counterparts made of hard base elastomer. It is shown that the controllability of the material, that is, the relative magnetorheological effect, is significantly improved in the case of magnetorheological elastomer with soft base elastomer. In addition to various magnetic fields, the samples are subjected to a range of loading amplitudes and frequencies. A general trend is observed where the frequency and strain amplitude cause an opposite effect on both the shear and compressive moduli: the increase in frequency gives rise to a higher value of modulus whereas the increase in amplitude reduces the modulus. Furthermore, the effect of bonding on the performance of the magnetorheological elastomers in compression mode is evaluated and the results indicate a significant increase in the modulus and decrease in the loss factor. In all the cases, however, the change of loss factor does not exhibit a predictable trend as a function of magnetic fields. In order to investigate a magnetorheological-based solution for controlling the damping of a semi-active system, magnetorheological fluid-elastomer samples are made in-house. These samples are fabricated using three different iron concentrations, and are tested in compression (squeeze) mode. The results of these experiments confirm that the equivalent damping coefficient of the material rises with the increase in magnetic field, and this effect becomes stronger as the iron concentration of magnetorheological fluids increases. It is also demonstrated that the magnetorheological effect is highly dependent on the loading frequency and amplitude, where the equivalent damping coefficient decreases with the increase in loading frequency and amplitude. In all the aforementioned cases, the stiffness of magnetorheological fluid-elastomers exhibits minor changes, which offers the in-house-developed magnetorheological fluid-elastomers as a damping only control option, a development that is different from the magnetorheological fluid-elastomers reported in the literature.

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13

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 (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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Damiani, Robbie, and LZ Sun. "Microstructural characterization and effective viscoelastic behavior of magnetorheological elastomers with varying acetone contents." International Journal of Damage Mechanics 26, no. 1 (2016): 104–18. http://dx.doi.org/10.1177/1056789516657676.

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Magnetorheological elastomers (MREs), a class of polymer-based composites with dispersed ferromagnetic micro-particles, fall in the class of smart materials, because their macroscopic or effective rheological properties can be continuously, rapidly, and reversibly changed with the application of a magnetic field. Conventional magnetorheological elastomers exhibit poor mechanical properties and magnetorheological effect as a result of their matrix materials and the particle-matrix interfaces. Here, we investigate the effect of acetone contents on the magnetorheological elastomer microstructure at the interfacial regions using the scanning electron microscope and the three-dimensional nano-CT imaging, as well as determining the overall or effective mechanical properties of magnetorheological elastomers. It is shown that acetone increases both the overall storage modulus and loss factor along with the magnetorheological effect due to acetone’s reaction on the interface as well as its effect on iron particle alignment.

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15

Winger, J., M. Schümann, A. Kupka, and S. Odenbach. "Influence of the particle size on the magnetorheological effect of magnetorheological elastomers." Journal of Magnetism and Magnetic Materials 481 (July 2019): 176–82. http://dx.doi.org/10.1016/j.jmmm.2019.03.027.

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Li, W. H., and X. Z. Zhang. "A study of the magnetorheological effect of bimodal particle based magnetorheological elastomers." Smart Materials and Structures 19, no. 3 (2010): 035002. http://dx.doi.org/10.1088/0964-1726/19/3/035002.

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17

Cao, Yongan, Huanglei Lu, Wenju Wang, et al. "The dynamic mechanical properties of magnetorheological elastomer: Catalytic effect of carbonyl iron powder." Journal of Intelligent Material Systems and Structures 31, no. 13 (2020): 1567–77. http://dx.doi.org/10.1177/1045389x20930090.

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The vulcanization time of the natural rubber–based magnetorheological elastomers and natural rubber was tested by the rotor-less vulcanizer. Result shows that the magnetorheological properties were best after adding 190 copies of carbonyl iron powder. From the test of rotor-less vulcanizer and equilibrium swelling method, it could be found that, after adding 190 copies of carbonyl iron powder, the crosslink density was increased by 11% and the vulcanization time was shortened by 20%. The catalytic activity of accelerator mainly originated from its ability of forming active vulcanizing agent with sulfur atom, and the possible mechanisms had been given. The carbonyl iron powder in magnetorheological elastomers improved the magnetorheological properties and the efficiency of vulcanization.

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Sun, Shu Lei, Xiong Qi Peng, and Zao Yang Guo. "Nonlinear Magnetostrictive Effect of Magnetorheological Elastomers." Advanced Materials Research 833 (November 2013): 291–94. http://dx.doi.org/10.4028/www.scientific.net/amr.833.291.

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Magnetorheological elastomers (MREs) are a class of smart composites whose mechanical properties can be obviously changed under different magnetic field. Only a few works study its magnetostrictive property, which describes the changes in dimensions of a material in its magnetization. Magnetostriction in the ferromagnetic particle is also called eigenstrain in MREs. It is modeled using the nonlinear function of the magnetization in this article. The eigenstrain due to the magnetostriction is incorporated in the structure of the MREs using a generalized Hookes Law. By means of initial strain, a finite element simulation is presented to describe the magnetostriction of MREs. The results show that the magnetostriction along the magnetic field depends on the magnetization and the volume fraction of particles. As an application, we will present numerical simulations for a magnetostriction and compare these results with measured data.

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NAGASHIMA, Kazushi, and Tetsu MITSUMATA. "Magnetorheological Effect for Bimodal Magnetic Elastomers." NIPPON GOMU KYOKAISHI 90, no. 1 (2017): 3–8. http://dx.doi.org/10.2324/gomu.90.3.

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Shan, Lei, Kaikai Chen, Ming Zhou, Xiangjun Zhang, Yonggang Meng, and Yu Tian. "Shear history effect of magnetorheological fluids." Smart Materials and Structures 24, no. 10 (2015): 105030. http://dx.doi.org/10.1088/0964-1726/24/10/105030.

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Nagashima, K., and T. Mitsumata. "Magnetorheological Effect for Bimodal Magnetic Elastomers." International Polymer Science and Technology 44, no. 6 (2017): 45–50. http://dx.doi.org/10.1177/0307174x1704400607.

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22

Levin, M. L., D. É. Polesskii, and I. V. Prokhorov. "Some features of the magnetorheological effect." Journal of Engineering Physics and Thermophysics 70, no. 5 (1997): 769–72. http://dx.doi.org/10.1007/bf02657636.

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23

Ashtiani, Mahshid, and Seyed Hassan Hashemabadi. "The effect of nano-silica and nano-magnetite on the magnetorheological fluid stabilization and magnetorheological effect." Journal of Intelligent Material Systems and Structures 26, no. 14 (2015): 1887–92. http://dx.doi.org/10.1177/1045389x15580659.

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24

Isaev, Danil, Anna Semisalova, Yulia Alekhina, Liudmila Makarova, and Nikolai Perov. "Simulation of Magnetodielectric Effect in Magnetorheological Elastomers." International Journal of Molecular Sciences 20, no. 6 (2019): 1457. http://dx.doi.org/10.3390/ijms20061457.

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We present the results of numerical simulation of magnetodielectric effect (MDE) in magnetorheological elastomers (MRE)—the change of effective permittivity of elastomer placed under the external magnetic field. The computer model of effect is based on an assumption about the displacement of magnetic particles inside the elastic matrix under the external magnetic field and the formation of chain-like structures. Such displacement of metallic particles between the planes of capacitor leads to the change of capacity, which can be considered as a change of effective permittivity of elastomer caused by magnetic field (magnetodielectric effect). In the literature, mainly the 2D approach is used to model similar effects. In this paper, we present a new approach of magnetorheological elastomers simulation—a 3D-model of the magnetodielectric effect with ability to simulate systems of 10 5 particles. Within the framework of the model, three types of particle size distributions were simulated, which gives an advantage over previously reported approaches. Lognormal size distribution was shown to give better qualitative match of the modeling and experimental results than monosized type. The developed model resulted in a good qualitative agreement with all experimental data obtained earlier for Fe-based elastomers. The proposed model is useful to study these novel functional materials, analyze the features of magnetodielectric effect and predict the optimal composition of magnetorheological elastomers for further profound experimental study.

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Vemuluri, Ramesh Babu, Vasudevan Rajamohan, and Ananda Babu Arumugam. "Dynamic characterization of tapered laminated composite sandwich plates partially treated with magnetorheological elastomer." Journal of Sandwich Structures & Materials 20, no. 3 (2016): 308–50. http://dx.doi.org/10.1177/1099636216652573.

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This study investigates the dynamic performance of the partially treated magnetorheological elastomer tapered composite sandwich plates. Various partially treated tapered magnetorheological elastomer laminated composite sandwich plate models are formulated by dropping-off the plies longitudinally in top and bottom composite face layers to yield tapered plates as the face layers. The uniform rubber and magnetorheological elastomer materials are considered as the core layer. The governing differential equations of motion of the various partially treated magnetorheological elastomer tapered composite sandwich plate configurations are derived using classical laminated plate theory and solved numerically. Further, silicon-based magnetorheological elastomer and natural rubber are being fabricated and tested to identify the various mechanical properties. The effectiveness of the developed finite element formulation is demonstrated by comparing the results obtained with experimental tests and available literature. Also, various partially treated magnetorheological elastomer tapered laminated composite sandwich plates are considered to the study the effect of location and size of magnetorheological elastomer segment on various dynamic properties under various boundary conditions. The effects of magnetic field on the variation of natural frequencies and loss factors of the various partially treated magnetorheological elastomer tapered laminated composite sandwich plate configurations are analysed at different boundary conditions. Also, the effect of taper angle of top and bottom layers, aspect ratio, ply orientations on the natural frequencies of different configurations are analysed. Further, the transverse vibration responses of three different partially treated magnetorheological elastomer tapered laminated composite sandwich plate configurations under harmonic excitation are analysed at various magnetic fields. This analysis suggests that the location and size of the magnetorheological elastomer segments strongly influence the natural frequency, loss factor and transverse displacements of the partially treated magnetorheological elastomer tapered laminated composite sandwich plates apart from the intensities of the applied magnetic field. This shows the applicability of partial treatment to critical components of a large structure to achieve a more efficient and compact vibration control mechanism with variable damping.

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Jiang, Wan-quan, Jing-jing Yao, Xing-long Gong, and Lin Chen. "Enhancement in Magnetorheological Effect of Magnetorheological Elastomers by Surface Modification of Iron Particles." Chinese Journal of Chemical Physics 21, no. 1 (2008): 87–92. http://dx.doi.org/10.1088/1674-0068/21/01/87-92.

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KORDONSKI, W. I., and S. D. JACOBS. "MAGNETORHEOLOGICAL FINISHING." International Journal of Modern Physics B 10, no. 23n24 (1996): 2837–48. http://dx.doi.org/10.1142/s0217979296001288.

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The technology of finishing for optics, ceramics, and semiconductors is one of the most promising uses of the magnetorheological effect. It perfectly coupled with computer control, allowing in quantity production the unique accuracy and quality of a polished surface to be achieved. The polishing process may appear as follows. A part rotating on the spindle is brought into contact with an magnetorheological polishing (MRP) fluid which is set in motion by the moving wall. In the region where the part and the MRP fluid are brought into contact, the applied magnetic field creates the conditions necessary for the material removal from the part surface. The material removal takes place in a certain region contacting the surface of the part which can be called the polishing spot or zone. The polishing process comes to the program-simulated movement of the polishing spot over the part surface. The mechanism of the material removal in the contact zone is considered as a process governed by the particularities of the Bingham flow in the contact zone. The problem like the hydrodynamic theory of lubrication is treated for plastic film. As this takes place the shear stresses distribution in the film is obtained from the experimental measurements of the pressure distribution in the contact spot. Reasonable correlation between calculated and experimental magnitudes of the material removal rate for glass polishing lends support to the validity of the approach.

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Zolfagharian, Mohammad Mehdi, Mohammad Hassan Kayhani, Mahmood Norouzi, and Amir Jalali. "Parametric investigation of twin tube magnetorheological dampers using a new unsteady theoretical analysis." Journal of Intelligent Material Systems and Structures 30, no. 6 (2019): 878–95. http://dx.doi.org/10.1177/1045389x19828494.

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In the present work, a new unsteady analytical model is developed for magnetorheological fluid flow through the annular gap which is opened on the piston head of twin tube magnetorheological damper, considering fluid inertia term into the momentum equation. This new unsteady model is based on Stokes’ second problem that is extended for magnetorheological fluid flow between finite oscillating parallel plates under the pressure gradient. A quasi-static analysis is also developed for magnetorheological fluid flow in twin tube damper, to compare its results with present unsteady solution and to show the effect of magnetorheological fluid inertia. The obtained results are validated experimentally and then, a parametric study is presented using both unsteady and quasi-static analysis. The effect of fluid inertia term is investigated on force–displacement and force–velocity loops, magnetorheological fluid velocity profile, pressure drop, phase difference between pressure drop and flow rate and change of plug thickness with time duration. According to the obtained results, quasi-static analysis included considerable error respect to new unsteady analysis as the gap height, magnetorheological fluid density, excitation frequencies and amplitudes are increased and yield stress is decreased. It is found that the plug thickness is considerably affected by inertia term of magnetorheological fluid.

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Aggumus, Huseyin, and Saban Cetin. "Experimental investigation of semiactive robust control for structures with magnetorheological dampers." Journal of Low Frequency Noise, Vibration and Active Control 37, no. 2 (2018): 216–34. http://dx.doi.org/10.1177/0263092317711985.

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This study investigates reducing the vibration of structures under different earthquakes using magnetorheological dampers. To investigate the effect of the magnetorheological damper arrangement on reducing the vibration amplitude of structures, experimental studies are conducted in which magnetorheological dampers are commanded by a robust controller. So, the performance of the system is investigated using different combinations of two magnetorheological dampers on a building and three different arrangements for dampers are considered for experimental study. Additionally, an H∞ controller is designed to determine the voltage transmitted to the magnetorheological dampers. The results show that the magnetorheological damper commanded with the robust controller effectively reduces the vibration of a six-story steel structure. Furthermore, the magnetorheological damper arrangement in which the one end is connected to the ground reduces the vibration amplitudes.

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Yang, Xue, Chang Geng Shuai, and Shen Lin Yang. "Magnetorheological Effect of NDI Polyurethane-Based MR Elastomers." Advanced Materials Research 750-752 (August 2013): 832–35. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.832.

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The dynamic magnetorheological (MR) effects of 1,5-Naphthalene diisocyanate (NDI) polyurethane-based MR elastomers were tested by changing excitation frequency, excitation amplitude, magnetic strength, or preload. NDI polyurethane-based elastomers show high dynamic mechanical property, and were used as base material to prepare MR elastomers, whose mechanical performance and dynamic MR effect were tested. The results show that: (1) the prepared NDI polyurethane-based MR elastomers have high mechanical performance and MR effect; (2) their MR effect was reduced with the increase in excitation amplitude or preload, but did not change obviously with the increase in excitation frequency. Therefore, MR elastomer devices should be reasonably designed to maximize MR effect.

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Wang, Jun, Liang Ma, Junhong Zhang, Xin Lu, and YangYang Yu. "Mitigation of nonlinear rub-impact of a rotor system with magnetorheological damper." Journal of Intelligent Material Systems and Structures 31, no. 3 (2019): 321–38. http://dx.doi.org/10.1177/1045389x19888729.

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In this work, a new method of using a magnetorheological damper to improve the self-adaptive ability of a rotor system to rub-impact is developed. To validate the feasibility of this method, a finite element model of the rub-impact rotor system with magnetorheological damper is investigated. A revised formula describing the relationship between the yielding shear stress and magnetic field intensity is proposed. Focusing on the mitigation effect of magnetorheological damper on the nonlinear dynamic response of the rotor system, numerical simulation is conducted. The results show that magnetorheological damper has a considerable effect on the vibration and stability of a rub-impact rotor system. When a suitable current is applied, magnetorheological damper can effectively mitigate the vibration of the rotor system to prevent rub-impact. If contact of the rotor/stator is inevitable, magnetorheological damper can further stabilize heavy rub-impact to slight rub-impact by adjusting the current to an appropriate value. This research reveals the influence mechanisms of magnetorheological damper on normal and rub-impact rotor systems and is helpful for vibration control and fault self-healing of rotating machinery.

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Zhu, Zhi Wei, Guang Xue Chen, Qi Feng Chen, and Bao Lin Tang. "Application of Water-Based Magnetorheological Fluid in the Production of Stereoscopic Printing Grating." Applied Mechanics and Materials 262 (December 2012): 435–39. http://dx.doi.org/10.4028/www.scientific.net/amm.262.435.

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As one of the intelligent materials, Magnetorheological Fluid is dispersions composed of soft magnetic particles, carrier liquid and additives. The apparent yield strength of Magnetorheological Fluid can be changed significantly within milliseconds by the application of an external magnetic field. As the key elements of the three-dimensional imaging, the three-dimensional grating is a special material composed of cylindrical lens. Because water-based magnetorheological fluid has a unique magnetorheological effect, good rheological properties and environment-friendly performance, it is applied to the production of three-dimensional printing grating, through the change of the magnetorheological fluid to control the exact distribution of the soft magnetic particles, so as to achieve the desired accuracy, light transmittance and stability of printing raster, and finally present a ideal three-dimensional effect after laminating the grating and three-dimensional images.

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Ahmad Khairi, Muntaz Hana, Saiful Amri Mazlan, Ubaidillah, et al. "The field-dependent complex modulus of magnetorheological elastomers consisting of sucrose acetate isobutyrate ester." Journal of Intelligent Material Systems and Structures 28, no. 14 (2017): 1993–2004. http://dx.doi.org/10.1177/1045389x16682844.

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In this work, epoxidized natural rubber-50 magnetorheological elastomer was synthesized using conventional rubber processing. The ester plasticizer sucrose acetate isobutyrate was then incorporated into epoxidized natural rubber-50 to soften the matrix and to improve the relative magnetorheological effect. The influence of sucrose acetate isobutyrate ester on the microstructures and properties of epoxidized natural rubber-50 magnetorheological elastomers were experimentally investigated. It has been identified that the addition of sucrose acetate isobutyrate ester can reduce the viscosity of the matrix and increase the mobility of magnetic particles in a matrix. The elongation of magnetorheological elastomer was increased by 19%, and the tensile strength was reduced by 17% at 10 wt% content of the sucrose acetate isobutyrate ester. It is observed that the employment of sucrose acetate isobutyrate ester enhanced the thermal stability leading to low degradation of the properties of magnetorheological elastomer. In rheology test, both absolute and relative magnetorheological effects were increased by 0.16 MPa and 23%, respectively, with incorporation of the 7.5-wt% sucrose acetate isobutyrate ester. It is also identified that the storage and loss moduli as well as loss factor are increased as the excitation frequency is increased. It is finally concluded that agglomeration issues in isotropic magnetorheological elastomer which degrade performances of magnetorheological elastomer application devices and systems can be resolved by the addition of sucrose acetate isobutyrate ester to epoxidized natural rubber-50 used in this work.

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López-López, Modesto T., Pavel Kuzhir, Georges Bossis, and Pavel Mingalyov. "Preparation of well-dispersed magnetorheological fluids and effect of dispersion on their magnetorheological properties." Rheologica Acta 47, no. 7 (2008): 787–96. http://dx.doi.org/10.1007/s00397-008-0271-6.

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Zhu, Shi Sha, Li Juan Qu, and You Hang Zhou. "Experimental Study of Magnetorheological Elastomer Vibration Isolator." Advanced Materials Research 335-336 (September 2011): 1334–39. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.1334.

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The magnetorheological elastomer has a broader potential application due to overcoming the settlement, poor stability, sealing problems and other shortcomings of magnetorheological fluid easily. Firstly the magnetorheological elastomer is prepared, and then it is experimentally proved that the magnetic effect of magneto-rheological elastomers is occurred under magnet field and the stiffness can be also adjusted by controlling the density of field through performance experiments. In this paper, a squeeze mode magnetorheological elastomer vibration isolator and a test rig are designed, it has been shown that the natural frequency of vibration isolator is changed, and the effect of vibration isolation is preferable from the amplitude-frequency characteristic curves for vibration control experiments.

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Zhang, Wei, Xing-long Gong, Tao-lin Sun, Yan-ceng Fan, and Wan-quan Jiang. "Effect of Cyclic Deformation on Magnetorheological Elastomers." Chinese Journal of Chemical Physics 23, no. 2 (2010): 226–30. http://dx.doi.org/10.1088/1674-0068/23/02/226-230.

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Kordonsky, William. "Elements and Devices Based on Magnetorheological Effect*." Journal of Intelligent Material Systems and Structures 4, no. 1 (1993): 65–69. http://dx.doi.org/10.1177/1045389x9300400108.

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Fonseca, H. A., E. Gonzalez, J. Restrepo, C. A. Parra, and C. Ortiz. "Magnetic effect in viscosity of magnetorheological fluids." Journal of Physics: Conference Series 687 (February 2016): 012102. http://dx.doi.org/10.1088/1742-6596/687/1/012102.

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Wei, J. H., C. J. Leng, X. Z. Zhang, W. H. Li, Z. Y. Liu, and J. Shi. "Synthesis and magnetorheological effect of Fe3O4-TiO2nanocomposite." Journal of Physics: Conference Series 149 (February 1, 2009): 012083. http://dx.doi.org/10.1088/1742-6596/149/1/012083.

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Mitsumata, Tetsu, Takafumi Yamamoto, Emiko Suzuki, and Jun-ichi Takimoto. "Giant Magnetorheological Effect of Agar Magnetic Gels." Transactions of the Materials Research Society of Japan 32, no. 3 (2007): 811–14. http://dx.doi.org/10.14723/tmrsj.32.811.

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Ouchi, Shunsuke, and Tetsu Mitsumata. "Magnetorheological Effect of Magnetic Gels Containing Fe2O3." Transactions of the Materials Research Society of Japan 34, no. 3 (2009): 459–60. http://dx.doi.org/10.14723/tmrsj.34.459.

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Soria-Hernández, Cintya, Luis Palacios-Pineda, Alex Elías-Zúñiga, Imperio Perales-Martínez, and Oscar Martínez-Romero. "Investigation of the Effect of Carbonyl Iron Micro-Particles on the Mechanical and Rheological Properties of Isotropic and Anisotropic MREs: Constitutive Magneto-Mechanical Material Model." Polymers 11, no. 10 (2019): 1705. http://dx.doi.org/10.3390/polym11101705.

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This article focuses on evaluating the influence that the addition of carbonyl iron micro-particles (CIPs) and its alignment have on the mechanical and rheological properties for magnetorheological elastomers (MREs) fabricated using polydimethylsiloxane (PDMS) elastomer, and 24 wt % of silicone oil (SO). A solenoid device was designed and built to fabricate the corresponding composite magnetorheological material and to perform uniaxial cyclic tests under uniform magnetic flux density. Furthermore, a constitutive material model that considers both elastic and magnetic effects was introduced to predict stress-softening and permanent set effects experienced by the MRE samples during cyclic loading tests. Moreover, experimental characterizations via Fourier transform infrared (FTIR), X-ray diffraction (XRD), tensile mechanical testing, and rheological tests were performed on the produced MRE samples in order to assess mechanical and rheological material properties such as mechanical strength, material stiffness, Mullins and permanent set effects, damping ratio, stiffness magnetorheological effect (SMR), and relative magnetorheological storage and loss moduli effects. Experimental results and theoretical predictions confirmed that for a CIPs concentration of 70 wt %, the material samples exhibit the highest shear modulus, stress-softening effects, and engineering stress values when the samples are subject to a maximum stretch value of 1.64 and a uniform magnetic flux density of 52.2 mT.

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Wu, Jingzhe, and Brian M. Phillips. "Mitigation of liquefaction-induced deformation with magnetorheological mechanism of micron-sized magnetite particles for saturated sand." Journal of Intelligent Material Systems and Structures 30, no. 7 (2019): 1115–30. http://dx.doi.org/10.1177/1045389x19829831.

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Soil-liquefaction-induced damage has been a major cause of ground failure and led to structural damage in the past earthquake events. With recent shifts in civil engineering to performance-based design methods, the traditional factor-of-safety-based approach to avoid liquefaction initiation may not be economical to control liquefaction-induced deformations directly leading to damage. In this article, a novel approach using the magnetorheological effect of micron-sized magnetite particles in liquefied sand for post-liquefaction stabilization and deformation mitigation is proposed. The mixture of sand and micron-sized magnetite particles, termed as magnetorheological sand, illustrates field-dependent behavior similar to other magnetorheological materials. The magnetorheological effect is illustrated through a sinking cylinder test of saturated magnetorheological sand prepared with 90% F75 silica sand and 10% 30-micron magnetite particles by weight. The magnetic-field-dependent properties of magnetorheological sand are then fit to a numerical model for evaluation as a foundation material. The performance of a five-story structure resting on a layer of soil on rigid rock with soil–structure interaction is evaluated. The numerical simulation results demonstrate that magnetorheological sand is effective in mitigating liquefaction-induced deformation and has the potential to outperform alternative mitigation approaches.

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Zschunke, F., R. Rivas, and P. O. Brunn. "Temperature Behavior of Magnetorheological Fluids." Applied Rheology 15, no. 2 (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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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 (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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Song, Wan-Li, Dong-Heng Li, Yan Tao, Na Wang, and Shi-Chao Xiu. "Simulation and experimentation of a magnetorheological brake with adjustable gap." Journal of Intelligent Material Systems and Structures 28, no. 12 (2016): 1614–26. http://dx.doi.org/10.1177/1045389x16679022.

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The aim of this work is to investigate the effect of the small magnetorheological fluid gap on the braking performance of the magnetorheological brake. In this article, theoretical analyses of the output torque are given first, and then the operating principle and design details of the magnetorheological brake whose magnetorheological fluid gap can be altered are presented and discussed. Next, the magnetic circuit of the proposed magnetorheological brake is conducted and further followed by a magnetostatic simulation of the magnetorheological brakes with different sizes of fluid gap. A prototype of the magnetorheological brake is fabricated and a series of tests are carried out to evaluate the braking performance and torque stability, as well as the verification of the simulation results. Experimental results show that the braking torque increases with the increase in the current, and the difference for the impact of the fluid gap on braking performance is huge under different currents. The rules, which the experimental results show, have an important significance on both the improvement of structure design for magnetorheological brake and the investigation of the wear property under different fluid gaps.

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Meng, Fanxu, Jin Zhou, Chaowu Jin, and Wentao Ji. "Modeling and experimental verification of a squeeze mode magnetorheological damper using a novel hysteresis model." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 15 (2019): 5253–63. http://dx.doi.org/10.1177/0954406219842906.

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The squeeze mode of the magnetorheological damper can be used to stabilize precision instruments (balances, optical devices, etc.) to eliminate interference from external vibrational noise, due to the small displacement and large damping offered by the magnetorheological fluid. The squeeze-strengthen effect observed experimentally in the magnetorheological fluid with squeeze mode can lead to the strain stiffening phenomenon, which is similar to that of the magnetorheological elastomer. In this study, a novel model is developed to characterize the dynamics of the squeeze mode magnetorheological damper considering the strain stiffening hysteresis behavior. An experimentally derived differential evolution algorithm is used to identify the model parameters. Simulation results show that the proposed model can accurately describe the dynamics of the squeeze mode magnetorheological damper including the strain stiffening phenomenon. Furthermore, the identified results obtained by the proposed model appear to be better than those obtained by the hyperbolic model.

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BRAMANTYA, Muhammad Agung, Hiroki TAKUMA, and Tatsuo SAWADA. "S0502-1-3 Study on the Effect of the Volume Fraction in Magnetorheological Fluid." Proceedings of the JSME annual meeting 2009.2 (2009): 103–4. http://dx.doi.org/10.1299/jsmemecjo.2009.2.0_103.

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Xu, Zhao-Dong, Si Suo, Jun-Tao Zhu, and Ying-Qing Guo. "Performance tests and modeling on high damping magnetorheological elastomers based on bromobutyl rubber." Journal of Intelligent Material Systems and Structures 29, no. 6 (2017): 1025–37. http://dx.doi.org/10.1177/1045389x17730909.

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A new kind of magnetorheological elastomer with the matrix of the bromobutyl rubber is developed. The magnetoviscoelasticity properties of the magnetorheological elastomer specimens are investigated with respect to different magnetic fields, displacement amplitudes, and frequencies under sinusoidal loadings. The experimental results show that the shear storage modulus and the loss factor of magnetorheological elastomers increase with the increasing magnetic field, excitation frequency, and the weight fraction of particles, but decrease with the increasing strain amplitude, and the magnetorheological elastomers have a high loss factor which can reach to 0.682. Then, a microphysical model based on the assumption of the chi-square distribution of the distance between adjacent ferromagnetic particles is proposed, which can eliminate the error generated by the assumption of the uniform distribution and describe the magnetorheological effect more exactly. Based on the proposed microphysical model, the magnetoviscoelasticity parameter model is modified to describe the dynamic properties of magnetorheological elastomers. It can be concluded from comparison between the numerical and experimental results that the modified magnetoviscoelasticity parameter model can describe the magnetorheological elastomer’s performance well.

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Yang, Yang, Zhao-Dong Xu, Ying-Qing Guo, Yan-Wei Xu, and Jie Zhang. "Internal magnetic field tests and magnetic field coupling model of a three-coil magnetorheological damper." Journal of Intelligent Material Systems and Structures 31, no. 19 (2020): 2179–95. http://dx.doi.org/10.1177/1045389x20943948.

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Magnetorheological damper is a typical semi-active control device. Its output damping force varies with the internal magnetic field, which is a key factor affecting the dynamic performance of the magnetorheological dampers. Existing studies about the magnetic field of magnetorheological dampers are limited to theoretical analysis; thus, this study aims to experimentally explore the complicated magnetic field distribution inside the magnetorheological dampers with multiple coils. First, the magnetic circuit of a three-coil magnetorheological damper was theoretically analyzed and designed, and the finite element model of the three-coil magnetorheological damper was set up to calculate the magnetic induction intensities of the damping gaps in different currents and numbers of coil turns. A three-coil magnetorheological damper embedded with a Hall sensor was then manufactured based on the theoretical and finite element analysis, and internal magnetic field tests under different conditions were carried out to obtain the actual magnetic induction intensities. At last, the magnetic field coupling model of the three-coil magnetorheological damper was proposed by introducing a coupling coefficient to describe the complex magnetic field distribution due to the strong coupling effect of the three coils, and the results calculated by the proposed model agreed well with the finite element analysis and magnetic field test data. The proposed model lays a foundation for the optimal design of the magnetic circuit and the mathematical model of multi-coil magnetorheological dampers.

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Journal articles on the topic 'Magnetorheological effect'

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