Study of the Behavior of MR Fluids in Squeeze, Torsional and Valve Modes

Kulkarni, Prashant S.; Ciocanel, Constantin; Vieira, S. L.; Naganathan, Nagi G.

doi:10.1142/9789812777546_0030

Cited by 13 publications

(18 citation statements)

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“…The advantage of this mode is the attainment of high stresses as compared to shear mode under the same external field strength (Tian et al 2003). Under compression mode, many factors contribute to the variable stresses, such as ratio of solid suspension to carrier liquid (Monkman 1995), initial gap distances (Tian et al 2003) and external field strength (Hagenbuchle and Liu 1997, Nilsson and Ohlson 2000, Kulkarni et al 2003. Monkman (1995) has considered the compressive effect for different types of ER fluids and observed that the hardness modulus of the fluids increases as the gap closes.…”

Section: Introductionmentioning

confidence: 99%

Apparent stress–strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Mazlan¹,

Ekreem²,

Olabi³

2008

J. Phys. D: Appl. Phys.

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Abstract. This paper presents an experimental investigation of two different magnetorheological (MR) fluids, namely water-based and hydrocarbon-based MR fluids in compression mode under various applied currents. Finite Element Method Magnetics was used to predict the magnetic field distribution inside the MR fluids generated by a coil. A test rig was constructed where the MR fluid was sandwiched between two parallel cylinders. During the compression, the upper cylinder was moved towards the lower cylinder in a vertical direction. Stress-strain relationships were obtained for arrangements of equipment where each type of fluid was involved, using compression test equipment. The apparent compressive stress was found to be increased with the increase in magnetic field strength. In addition, the apparent compressive stress of the water-based MR fluid showed a response to the compressive strain of greater magnitude. However, during the compression process, the hydrocarbon-based MR fluid appeared to show a unique behaviour where an abrupt pressure drop was discovered in a region where the apparent compressive stress would be expected to increase steadily. The conclusion is drawn that the apparent compressive stress of MR fluids is influenced strongly by the nature of the carrier fluid and by the magnitude of the applied current.

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Section: Introductionmentioning

confidence: 99%

Apparent stress–strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Mazlan¹,

Ekreem²,

Olabi³

2008

J. Phys. D: Appl. Phys.

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“…Consequently, systematic investigations have been carried out by many researchers to evaluate the mechanical and electrical properties of ER and MRF in squeeze flow. Despite the fact that the Bingham plastic model was used to describe the behaviour of ER fluid in shear mode, Nilsson and Ohlson [62] have not recommended to utilize that model in squeeze mode. Bingham parameters tested from shear mode are not well-founded for the calculation of the squeeze mode behaviour.…”

Section: Squeeze Modementioning

confidence: 99%

“…In another experimental study done by Kulkarni et al [62], the performance ofhe combination of squeeze and shear modes of MRF in dynamic loading was investigated. Even though squeeze mode can produce the highest strength among all modes, the addition of squeeze mode to shear mode did not always give a better strength than the shear mode alone.…”

Section: Combination Of Modesmentioning

confidence: 99%

Optimal Design Methodology of Magnetorheological Fluid Based Mechanisms

Nguyen¹,

Choi²

2012

Smart Actuation and Sensing Systems - Recent Advances and Future Challenges

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“…The changes in the magnetic field are due to the fluid gap modification and due to the different phase volume of the system, as expected for hard particles. A similar approach was used in other works about the so called squeeze-strengthen effect [8][9][10][11][12][13][14][15][16][17] in which many researchers demonstrates that there is a strong enhancement of the apparent yield stress of the fluid when there is a combination of shear and compression. This behaviour is due to the formation of larger particles columns, as stated by [11,18] thanks to the compressive state resulting in a higher yield stress when the magnetic field is applied.…”

Section: Introductionmentioning

confidence: 96%

Characterization of commercial magnetorheological fluids at high shear rate: influence of the gap

Golinelli¹,

Spaggiari²

2018

Smart Mater. Struct.

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This paper reports the experimental tests on the behaviour of a commercial MR fluid at high shear rates and the effect of the gap. Three gaps were considered at multiple magnetic fields and shear rates. From an extended set of almost two hundred experimental flow curves, a set of parameters for the apparent viscosity are retrieved by using the Ostwald de Waele model for non-Newtonian fluids. It is possible to simplify the parameter correlation by making the following considerations: the consistency of the model depends only on the magnetic field, the flow index depends on the fluid type and the gap shows an important effect only at null or very low magnetic fields. This lead to a simple and useful model, especially in the design phase of a MR based product. During the off state, with no applied field, it is possible to use a standard viscous model. During the active state, with high magnetic field, a strong non-Newtonian nature becomes prevalent over the viscous one even at very high shear rate; the magnetic field dominates the apparent viscosity change, while the gap does not play any relevant role on the system behaviour. This simple assumption allows the designer to dimension the gap only considering the non-active state, as in standard viscous systems, and taking into account only the magnetic effect in the active state, where the gap does not change the proposed fluid model.

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Study of the Behavior of MR Fluids in Squeeze, Torsional and Valve Modes

Cited by 13 publications

References 0 publications

Apparent stress–strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Apparent stress–strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Optimal Design Methodology of Magnetorheological Fluid Based Mechanisms

Characterization of commercial magnetorheological fluids at high shear rate: influence of the gap

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