Effect of friction between particles in the dynamic response of model magnetic structures

Vicente, J. De; Ramı́rez, Javier

doi:10.1016/j.jcis.2007.08.022

Cited by 22 publications

(16 citation statements)

References 26 publications

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“…On the other side, on prolong use of this MR fluid, the spherical particles change its shape, which results in a reduction in MR effect-the phenomena in which the strong dipoledipole interaction between the particles under the influence of the magnetic field increases the apparent viscosity of the fluid. A number of researchers have reported this effect of change in particle shape by tribology studies [7][8][9]. Similarly, Utami et al [10] have reported the shape change of CI particles after long-term cyclic operation when used in MR damper.…”

Section: Introductionmentioning

confidence: 96%

Life-Cycle Evaluation of Anisotropic Particle-Based Magnetorheological Fluid in MR Brake Performance

2020

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The work reports the life-cycle test of flake-shaped particle-based magnetorheological (MR) fluid using the MR brake system and evaluated the performance of brake. The choice of the application is based on the understanding that normal force in this case is zero and the same is not true for other applications. Thus, it will exhibit only shear-induced deformation/degradation of MR fluid properties. The test was performed under a constant magnetic field for 10 5 cycles at 300 rpm. The MR fluid collected after cyclic operation exhibits no change in surface morphology as well as MR properties. Thus, the torque transmission even after this cycle remains the same. This is not the same when commercially available spherical particle-based MR fluid is used. There is a decrement in the torque transmission of MR brake by~30%. The results are discussed on the basis of MR effect and the change in surface morphology of particles. The results confirm that the use of flake-shaped-based MR fluid gives better performance when used for long-term application.

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Section: Introductionmentioning

confidence: 96%

Life-Cycle Evaluation of Anisotropic Particle-Based Magnetorheological Fluid in MR Brake Performance

2020

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“…9 Chain or column structures are the key phenomena in MR effects, 10,11 and the shear stress of MR fluids comprises the magnetic, friction, and viscous forces of the base oil. [12][13][14] However, the insufficient understanding of MR effects impedes the potential applications of MR fluids. In fact, some interesting phenomena have been observed in MR fluids.…”

mentioning

confidence: 99%

Unexpected shear strength change in magnetorheological fluids

et al. 2014

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Smart materials of magnetorheological (MR) fluids could be turned from a liquid state into a solid state, which solidification extent or shear strength often increases monotonically with the applied magnetic field. In this study, the shear stress of a dilute MR fluid decreased with increasing applied magnetic field at a constant shear rate. The dynamic shear stress was significantly higher than the stable counterpart at medium magnetic fields. They are ascribed to the slow particle structure transformation. A higher shear rate and particle volume fraction could reduce the transient time and the shear strength difference.

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“…Such an interpretation is somewhat different from the above considered scenario of periodically breaking and reforming structures. More information about the role of friction forces on the rheology of ER and MR fluids can be found in [de Vicente and Ramírez (2007), Kuzhir et al (2009), Tian et al (2010-a, 2010-b, 2011].…”

mentioning

confidence: 99%

Stick–slip instabilities in the shear flow of magnetorheological suspensions

López–López¹,

Kuzhir²,

Rodríguez‐Arco³

et al. 2013

Journal of Rheology

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SynopsysThis work is devoted to the stick-slip instabilities that appear in the shear flow of highly concentrated suspensions of magnetic microparticles. The effect of the applied magnetic field strength was analyzed in details. With this aim, homogeneous suspensions of iron microparticles with concentration near the limit of maximum-packing fraction were prepared, and shear-flow measurements were performed in a controlled-rate mode using a rheometer provided with a rough parallel-plate geometry. For each given value of the shear rate, the time evolution of the shear stress was monitored for at least 20 min. Saw-tooth-like stress oscillations, typical of stick-slip instabilities, were obtained at low enough shear rate values.The measurements were restricted to small enough oscillations, at which the rheometer was still able to maintain the shear rate constant. From the microscopic viewpoint, these stick-slip instabilities principally appear due to the periodic failure and healing of the field-induced particle structures, as inferred from experimental observations. This hypothesis is corroborated by a theoretical model developed on the basis of the balance of the magnetic and hydrodynamic torques over the particle structures, allows us to predict the correct order of magnitude of the main parameters of the stick-slip instabilities, including the amplitude and period of the stress oscillations.

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Effect of friction between particles in the dynamic response of model magnetic structures

Cited by 22 publications

References 26 publications

Life-Cycle Evaluation of Anisotropic Particle-Based Magnetorheological Fluid in MR Brake Performance

Life-Cycle Evaluation of Anisotropic Particle-Based Magnetorheological Fluid in MR Brake Performance

Unexpected shear strength change in magnetorheological fluids

Stick–slip instabilities in the shear flow of magnetorheological suspensions

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