Preparation and mechanical characteristics of poly(methylaniline) based electrorheological fluid

Choi, Seung Bok; Choi, Hyoung Jin; Choi, Young-Tai; Wereley, Norman M.

doi:10.1002/app.21633

Cited by 15 publications

(9 citation statements)

References 22 publications

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“…The external magnetic field is 280 mT, the particle concentration of the MR fluid is 30%, the viscosity of oil is 500 cSt and the initial gap distance is 1.5 mm. 23]. The index of the power law relation between the normal force and the gap size is less than the theoretical analysis, which also arises from the squeeze strengthening effect and the sealing effect.…”

Section: Effect Of Squeeze Velocity On the Normal Forcementioning

confidence: 99%

Squeeze behavior of magnetorheological fluids under constant volume and uniform magnetic field

Guo¹,

Gong²,

Xuan³

et al. 2013

Smart Mater. Struct.

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In this work the experimental investigation of magnetorheological fluids in squeeze mode has been carried out under constant volume with a self-developed device. The magnetorheological fluids were forced to move in all directions in a horizontal plane as the two flat surfaces came together. A pair of Helmholtz coils was used to generate a uniform magnetic field in the compression gap. The normal forces within the gap were systematically studied for different magnetic field, squeeze velocity, particle concentration, viscosity of carrier fluid and initial gap distance. Two regions of behavior were obtained from the normal force versus gap distance curve: elastic deformation and plastic flow. A power law fitting was appropriate for the relation between the normal force and the gap in the plastic flow. The index of the power law was smaller than that predicted by the continuum theory, possibly due to the squeeze strengthening effect and the sealing effect.

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Section: Effect Of Squeeze Velocity On the Normal Forcementioning

confidence: 99%

Squeeze behavior of magnetorheological fluids under constant volume and uniform magnetic field

Guo¹,

Gong²,

Xuan³

et al. 2013

Smart Mater. Struct.

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“…Actually, the high power cost, expensive hardware, complicated control algorithm, and high instability potential are the main factors limiting the practical application of active systems (Nguyen and Choi, 2008;Sun et al, 2017;Yu et al, 2009). As a typical semi-active approach, the adaptive dampers using smart materials like electrorheological fluids and magnetorheological fluids were studied (Choi et al, 2005;Li et al, 2014;Li and Wang, 2012;Wang and Gordaninejad, 2006;Wen et al, 2003;Yokoyama et al, 2001;Zhang et al, 2008). Wang designed a sensor-free gun recoil system based on an MR damper to replace the conventional gun recoil absorber, which reduced vibrations and stroke displacements for the recoil body (Wang and Li, 2005).…”

Section: Introductionmentioning

confidence: 99%

A smart passive MR damper with a hybrid powering system for impact mitigation: An experimental study

Jin

Deng

Yang

et al. 2021

Journal of Intelligent Material Systems and Structures

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This paper presents a smart passive MR damper with fast-responsive characteristics for impact mitigation. The hybrid powering system of the MR damper, composed of batteries and self-powering component, enables the damping of the MR damper to be negatively proportional to the impact velocity, which is called rate-dependent softening effect. This effect can keep the damping force as the maximum allowable constant force under different impact speed and thus improve the efficiency of the shock energy mitigation. The structure, prototype and working principle of the new MR damper are presented firstly. Then a vibration platform was used to characterize the dynamic property and the self-powering capability of the new MR damper. The impact mitigation performance of the new MR damper was evaluated using a drop hammer and compared with a passive damper. The comparison results demonstrate that the damping force generated by the new MR damper can be constant over a large range of impact velocity while the passive damper cannot. The special characteristics of the new MR damper can improve its energy dissipation efficiency over a wide range of impact speed and keep occupants and mechanical structures safe.

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“…As an analogy of field-responsive smart materials, the squeeze flow behaviors of electrorheological (ER) fluids were first and thoroughly investigated [Choi et al (2005); Chu et al (2000); McIntyre and Filisko (2007); See et al (1999); ; Yang (1997)]. The characterization technologies and the squeeze mechanisms of ER fluids can be used for references to the investigation on the squeeze flow behaviors of MR fluids.…”

Section: Introductionmentioning

confidence: 99%

Squeeze flow behaviors of magnetorheological plastomers under constant volume

Gong²,

Liu³

et al. 2014

Journal of Rheology

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The squeeze flow behaviors (including compressive, tensile, and oscillatory squeeze behaviors) of magnetorheological plastomers (MRPs, a kind of solidlike magnetic gels) under different experimental conditions are systematically investigated. Both compression and tension processes can be classified as elastic deformation region, stress relaxation region, and plastic flow region. A squeeze flow equation is used to describe the compressive behaviors of MRP in plastic flow region from which the compressive yield stress can be obtained and compared. The results demonstrate that both compressive yield stress and tensile yield stress are sensitive to magnetic field, particle distribution, and particle concentration. The yield stress of MRP under squeeze flow is larger than that of MR fluids due to the existence of polymer matrix. Asymmetry of hysteresis loop is found under oscillatory squeeze mode. The oscillatory squeeze behaviors of MRP are also influenced by magnetic field and particle concentration, but the influence of particle distribution is not so obvious. The related results under three operational modes are compared and qualitatively analyzed, which are helpful for further understanding the MR mechanism in the solidlike magnetic gels. V

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Preparation and mechanical characteristics of poly(methylaniline) based electrorheological fluid

Cited by 15 publications

References 22 publications

Squeeze behavior of magnetorheological fluids under constant volume and uniform magnetic field

Squeeze behavior of magnetorheological fluids under constant volume and uniform magnetic field

A smart passive MR damper with a hybrid powering system for impact mitigation: An experimental study

Squeeze flow behaviors of magnetorheological plastomers under constant volume

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