Strain-dependent dynamic compressive properties of magnetorheological elastomeric foams

Wereley, Norman M.; Pérez, C.; Choi, Young-Tai

doi:10.1063/1.5007266

Cited by 12 publications

(3 citation statements)

References 9 publications

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“…Thus, MREFs are inherently free of sedimentation and fluid leakage and show larger controllable stiffness and damping capabilities because of very soft and flexible in the absence of a magnetic field. These advantages have prompted researchers to investigate the application of adaptively controllable vibration and sound absorption devices [ 11 , 12 , 13 , 14 , 15 ] and a haptic tactile device [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Magnetorheological Impact Foams in Compression

Choi,

Wereley

2024

Micromachines

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This study focuses on the development and compressive characteristics of magnetorheological elastomeric foam (MREF) as an adaptive cushioning material designed to protect payloads from a broader spectrum of impact loads. The MREF exhibits softness and flexibility under light compressive loads and low strains, yet it becomes rigid in response to higher impact loads and elevated strains. The synthesis of MREF involved suspending micron-sized carbonyl Fe particles in an uncured silicone elastomeric foam. A catalyzed addition crosslinking reaction, facilitated by platinum compounds, was employed to create the rapidly setting silicone foam at room temperature, simplifying the synthesis process. Isotropic MREF samples with varying Fe particle volume fractions (0%, 2.5%, 5%, 7.5%, and 10%) were prepared to assess the effect of particle concentrations. Quasi-static and dynamic compressive stress tests on the MREF samples placed between two multipole flexible strip magnets were conducted using an Instron servo-hydraulic test machine. The tests provided measurements of magnetic field-sensitive compressive properties, including compression stress, energy absorption capability, complex modulus, and equivalent viscous damping. Furthermore, the experimental investigation also explored the influence of magnet placement directions (0° and 90°) on the compressive properties of the MREFs.

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Section: Introductionmentioning

confidence: 99%

Characterization of Magnetorheological Impact Foams in Compression

Choi,

Wereley

2024

Micromachines

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“…MREs are a new class of smart materials in which the mechanical properties can be controlled by applying the input current to the coils that generates the magnetic field [2][3][4][5][6][7]. The state-of-theart MRE has attracted in many applications, such as the base isolation of civil structures [8][9][10][11][12], engine mounts [13][14][15], seat suspensions [15][16][17] and vibration absorbers [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

A hybrid skyhook active force control for impact mitigation using magneto-rheological elastomer isolator

Rahmat

Hudha

Kadir

et al. 2021

Smart Mater. Struct.

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This paper presents control characteristic of an impact isolator featuring a magneto-rheological elastomer isolator device (MREID). The developed MREID is analysed in term of its magnetic intensity to produce a large of MR effect that controlled by the input current. In order to control the input current, the hybrid skyhook active force control (HySAFC) is proposed. The HySAFC is used to track the signal based on the force obtained from the feedback of the force sensor and accelerometer. However, the control output of the HySAFC is desired force of the current generator which is designed using the inverse adaptive neuro-fuzzy inference system (ANFIS). Then, the selection of the input current using the IF-THEN rules depend on desired force and impact energy for current generator. Next, for the development of control structure, the impact isolation system is formulated and the impact isolation test rig is used to perform the experimental validation process. The validation assessment of HySAFC is experimentally realized, and the control responses, namely such as jerk, accelerations and transmitted forces as well as the impact isolation system are presented in the time domain. Finding of this study, the HySAFC is able to improve the MREID performance for impact loading application in simulation and experiment and capable in providing fast response when impact occurred.

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“…MRFs have the advantages of rapid change, continuous, high efficiency, safety, and reliability. MRFs are also widely designed with a damper (Bica et al, 2013), arrester brake (Tomori et al, 2012), flexible fixture (Wereley et al, 2018), hydraulic valve (Abd Fatah et al, 2015), and sealing device (Topçu et al, 2018). In addition, MRF has an application prospect in military (Ha et al, 2013), healthcare (Alam et al, 2019), and virtual feedback technology (Choi et al, 2015; Winter and Bouzit, 2007).…”

Section: Introductionmentioning

confidence: 99%

Influence of magnetic field, magnetic particle percentages, and particle diameters on the stiffness of magnetorheological fluids

Sun

Cai

2020

Journal of Intelligent Material Systems and Structures

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Generally, variable stiffness joints of soft robots are generally fabricated using thermoplastics and elastomers due to their ability to change state from rigid to flexible and vice versa. However, these materials require a considerable amount of time to change states and are associated with other technical drawbacks. We demonstrate the instantaneous physical transformation of a Ga-based magnetorheological fluid called Gallistan from a liquid to a viscoelastic solid, and precisely controlled within milliseconds under an applied magnetic field. We studied the magnetic properties of a magnetorheological fluid by dispersing Fe particles in a Ga–In–Sn eutectic alloy. Theoretical analysis of the movement of two particles under magnetic field and typical defects in dipolar chains is studied. The experimental results showed a reversible change in Young’s modulus depending not only on the magnetic field intensity but also the percentage of magnetic particles. Thus, we confirm that the arrangement of magnetic particles transition from random distribution to stable chain structures in the magnetic field. Based on the bi-material nested cantilever beam, the variable stiffness joints can also be precisely adjusted under a magnetic field. In future, this property of the magnetorheological fluid will help develop a variable stiffness joint for soft robotics.

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Strain-dependent dynamic compressive properties of magnetorheological elastomeric foams

Cited by 12 publications

References 9 publications

Characterization of Magnetorheological Impact Foams in Compression

Characterization of Magnetorheological Impact Foams in Compression

A hybrid skyhook active force control for impact mitigation using magneto-rheological elastomer isolator

Influence of magnetic field, magnetic particle percentages, and particle diameters on the stiffness of magnetorheological fluids

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