Micro-geometry Effects on the Nonlinear Effective Yield Strength Response of Magnetorheological Fluids

Nika, Grigor; Vernescu, Bogdan

doi:10.1007/978-3-030-62030-1_1

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…The decrement of G′max could As shown in Figure 4, it was observed that the G of all PVA-based MRP samples increased with increasing shear frequency from 0.01 to 10 Hz under the magnetic field, which proved that the PVA-based MRP would become stiffer at a higher external shear frequency. In fact, the G was always greater than the G , which means that all samples exhibited solid-like behaviour when exposed to the magnetic field due to the strengthening of CIP interactions [34,35] Moreover, it was also proved that the PVA-based MRP exhibited a synergistic effect as the PVA-based MRP responded to two different external stimuli simultaneously, namely shear frequency and magnetic field. In the condition under the magnetic field, the CIPs played a big role in strengthening the PVA-based MRP by rearranging themselves into chain-like structures depending on the strength of the magnetic field.…”

Section: Shear Stiffening Effect Of Hydrogel Mrpmentioning

confidence: 93%

Dual Properties of Polyvinyl Alcohol-Based Magnetorheological Plastomer with Different Ratio of DMSO/Water

Hapipi

Mazlan

Ubaidillah

et al. 2021

Sensors

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Polyvinyl alcohol (PVA)-based magnetorheological plastomer (MRP) possesses excellent magnetically dependent mechanical properties such as the magnetorheological effect (MR effect) when exposed to an external magnetic field. PVA-based MRP also shows a shear stiffening (ST) effect, which is very beneficial in fabricating pressure sensor. Thus, it can automatically respond to external stimuli such as shear force without the magnetic field. The dual properties of PVA-based MRP mainly on the ST and MR effect are rarely reported. Therefore, this work empirically investigates the dual properties of this smart material under the influence of different solvent compositions (20:80, 40:60, 60:40, and 80:20) by varying the ratios of binary solvent mixture (dimethyl sulfoxide (DMSO) to water). Upon applying a shear stress with excitation frequencies from 0.01 to 10 Hz, the storage modulus (G′) for PVA-based MRP with DMSO to water ratio of 20:40 increases from 6.62 × 10−5 to 0.035 MPa. This result demonstrates an excellent ST effect with the relative shear stiffening effect (RSTE) up to 52,827%. In addition, both the ST and MR effect show a downward trend with increasing DMSO content to water. Notably, the physical state of hydrogel MRP could be changed with different solvent ratios either in the liquid-like or solid-like state. On the other hand, a transient stepwise experiment showed that the solvent’s composition had a positive effect on the arrangement of CIPs within the matrix as a function of the external magnetic field. Therefore, the solvent ratio (DMSO/water) can influence both ST and MR effects of hydrogel MRP, which need to be emphasized in the fabrication of hydrogel MRP for appropriate applications primarily with soft sensors and actuators for dynamic motion control.

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Section: Shear Stiffening Effect Of Hydrogel Mrpmentioning

confidence: 93%

Dual Properties of Polyvinyl Alcohol-Based Magnetorheological Plastomer with Different Ratio of DMSO/Water

Hapipi

Mazlan

Ubaidillah

et al. 2021

Sensors

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An existence result for a suspension of rigid magnetizable particles

Nika,

Vernescu

2024

Banach J. Math. Anal.

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We establish the existence of a weak solution for a strongly coupled, nonlinear Stokes–Maxwell system, originally proposed by Nika and Vernescu (Z Angew Math Phys 71(1):1–19, 2020) in the three-dimensional setting. The model effectively couples the Stokes equation with the quasi-static Maxwell’s equations through the Lorentz force and the Maxwell stress tensor. The proof of existence is premised on: (i) the augmented variational formulation of Maxwell’s equations, (ii) the definition of a new function space for the magnetic induction and the verification of a Poincar’e-type inequality, and (iii) the deployment of the Altman–Shinbrot fixed point theorem when the magnetic Reynolds number, $${\text {R}_{\text {m}}},$$ R m , is small.

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Micro-geometry Effects on the Nonlinear Effective Yield Strength Response of Magnetorheological Fluids

Cited by 2 publications

References 13 publications

Dual Properties of Polyvinyl Alcohol-Based Magnetorheological Plastomer with Different Ratio of DMSO/Water

Dual Properties of Polyvinyl Alcohol-Based Magnetorheological Plastomer with Different Ratio of DMSO/Water

An existence result for a suspension of rigid magnetizable particles

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