Encapsulations of Magnetorheological Fluids Within 3-D Printed Elastomeric Cellular Structures

Park, Jungjin; Choi, Young-Tai; Flatau, Alison B.; Wereley, Norman M.

doi:10.1109/tmag.2021.3137838

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…However, the variable modulus, another viscoelastic parameter of MR fluid, has received less attention in literature (Wang and Meng 2001). Nevertheless, among recently reported studies on MR fluid application, some devices demonstrate variable stiffness by utilizing the variable modulus of MR fluid (Jackson, et al, 2018;Hong, et al, 2019;Park, et al, 2021). These examples include MR fluid filled metamaterials, cellular structures, and multi-channel structures and denote a promising future for a new class of adaptive MR fluid-based devices.…”

Section: Introductionmentioning

confidence: 99%

Magnetorheological Fluid Filled Spring for Variable Stiffness and Damping: Current and Potential Performance

Sikulskyi¹,

Malik

Kim

2022

Front. Mater.

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Magnetorheological (MR) fluid is a smart material utilized for semi-active damping devices thanks to its ability to become viscoelastic solid under a magnetic field and provide variable damping. While most of these devices primarily utilize the fluid’s drastic increase in viscosity, its variable stiffness is rarely utilized. A MR fluid filled spring is a novel device with variable stiffness and damping and is the subject of the present study. First, the derived analytical model and the device’s controllable stiffness capability were experimentally validated by performing tensile tests with a fabricated hollow polymer spring filled with MRF-132DG. The analytical model was proved to describe the MR fluid static effect of increased spring stiffness accurately. Secondly, dynamic testing demonstrated the device’s controllable damping and capability to shift natural frequencies. In addition, the testing unveiled an enhanced dynamic performance of the spring due to the cumulative effect of MR fluid activation and specifically aligned uniform magnetic field. Finally, the hollow spring design was optimized through analytical and non-linear finite element buckling analysis to maximize MR fluid stiffness effect. The resulting critical parameters of the optimized design were used to estimate the effects of hollow spring material and operating conditions on the variable stiffness of the device.

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Section: Introductionmentioning

confidence: 99%

Magnetorheological Fluid Filled Spring for Variable Stiffness and Damping: Current and Potential Performance

Sikulskyi¹,

Malik

Kim

2022

Front. Mater.

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Discrete fiber skeleton strengthened magnetorheological grease and a novel H–B model based on fiber parameters

Wang,

Gao

et al. 2024

AIP Advances

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Magnetorheological fluid (MRF) porous fabric composite has been demonstrated to improve the shear properties of MRF. Non-woven fabric is manufactured from a multitude of fibers through spinning or melt-blown processing methods. As the fundamental unit of non-woven fabric, fibers without spinning or melt-blown directly influence the shear properties of magnetorheological (MR) materials. However, the effect of unprocessed fiber on the shear properties of MR grease remains uncertain. This study introduces a novel MR grease with fiber threads (MRG-FT) by incorporating fiber threads into MRG. The effects of fiber thread length, mass fraction, and material type on MRG shear stress are investigated. Compared to conventional MRG, the maximum shear stress of MRG-FT is increased by 31.8% under the magnetic field of 0.64 T. A novel Herschel–Bulkley–Fiber (H-B-F) model that considers fiber parameters (tenacity, mass fraction, etc.) is proposed based on the H–B model. To validate the enhancement of MRG by fiber threads, a linear damper based on shear mode has been designed and tested. The results demonstrate a 23.8% increase in the maximum damping force of MRG-FT compared to conventional MRG under an excitation current of 1.6 A. This study reveals the influence of fiber threads, which directly influences the shear properties of MRG upon the application of the magnetic field. The maximum damping force of the MRG can be increased by 23.8% by only 1.5% mass fraction of fibers.

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Development of magnetorheological fluids within 3D printed elastomeric cellular structures with an accumulator

et al. 2023

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In this study, a magnetorheological fluid (MRF) was encapsulated in a 3D printed cellular elastomeric encapsulant. Mechanical properties, such as stiffness and damping, of the encapsulant containing MRFs can be controlled via applied magnetic field. Such tunability can be exploited for adaptive vibration control or energy absorption systems. Here, MRF prepared with silicon oil (40% volume fraction) was injected into the 3D printed thermoplastic polyurethane (TPU) cellular encapsulant. The wall adjacent to the sealing layer had a circular opening and a TPU membrane was bonded to its perimeter so that the pressurized MRF could flow through the opening and be accumulated in the resulting pocket. An external magnetic field (0–350 mT) was applied to the sample at the time of uniaxial dynamic testing with 5% pre-strain. The MRF-TPU composites were characterized via cyclic force-displacement tests (1 Hz) under displacement amplitudes. The area of the force-displacement curve of the system with an accumulator is about 26% greater than one without an accumulator. The effect of the accumulator on the mechanical properties of the MRF-TPU composites was studied with strain amplitude and magnetic fields.

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Encapsulations of Magnetorheological Fluids Within 3-D Printed Elastomeric Cellular Structures

Cited by 4 publications

References 22 publications

Magnetorheological Fluid Filled Spring for Variable Stiffness and Damping: Current and Potential Performance

Magnetorheological Fluid Filled Spring for Variable Stiffness and Damping: Current and Potential Performance

Discrete fiber skeleton strengthened magnetorheological grease and a novel H–B model based on fiber parameters

Development of magnetorheological fluids within 3D printed elastomeric cellular structures with an accumulator

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