Magnetic Particle Reinforced Elastomer Composites for Additive Manufacturing

Park, Jungjin; Becnel, Andrew C.; Flatau, Alison B.; Wereley, Norman M.

doi:10.1109/tmag.2021.3084506

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…Thus, further device development is seen in utilizing magnetorheological elastomer (MRE) instead of MR fluid. Being a solid material in a passive state, MRE will resist buckling of the hollow spring, prevent oil leakage, ease device handling, and potentially enable device additive manufacturing (Böse et al, 2021;Park et al, 2022). A higher range of controllable modulus and research interest to improve this material property will enhance the variable stiffness of the device.…”

Section: Design Optimizationmentioning

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: Design Optimizationmentioning

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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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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