A novel methodology for accurate estimation of magnetic permeability of magnetorheological elastomers

Vatandoost, Hossein; Rakheja, Subhash

doi:10.1016/j.jmmm.2022.169669

Cited by 10 publications

(6 citation statements)

References 45 publications

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“…Indeed, several previous studies have shown strong viscoelastic behaviors with relevant relaxation mechanisms that play important roles in the transient magneto-mechanical response. [44][45][46][47] Instead of using magnetoactive bistable beam elements, we incorporated a hMRE sample within the upper rigid component of the bistable structure used in the previous sections (see Figure 3D; Figures S12 and S13, Supporting Information). This responsive element can interact with external magnetic fields transmitting an actuating force to the structure.…”

Section: The Design Of Fast-actuating Magneto-responsive Bistable Str...mentioning

confidence: 99%

Magneto‐Responsive Bistable Structures with Rate‐Dependent Actuation Modes

Perez‐Garcia,

Aranda‐Ruiz,

Lopez‐Donaire

et al. 2024

Adv Funct Materials

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Structural instabilities can be used to provide rapid responses activated by mechanical force or displacement thresholds. The emergence of responsive materials has opened the door for adapting such structural instabilities to actuators that will abruptly deform guided by external stimuli. However, fast configurational transitions between equilibrium states imply important viscoelastic roles at the material level that inevitably scale up to the structural level. A comprehensive understanding of viscoelastic effects is provided on bistable structural transitions combining a new experimental perspective and a thorough modeling analysis. The insights from these results are here translated to magneto‐responsive bistable structures offering a route‐map to design effective actuation conditions. The bistable transition functionally depends on the combination of magnetic field amplitude and application rate. The understanding of the viscoelastic and magneto‐mechanical coupling provides efficient actuation via temporal magnetic pulses, removing the need of generating continued magnetic fields. Finally, these insights are combined to develop a responsive structure whose transient and steady bistable transitions can be modulated by the application rate of external magnetic stimuli.

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Section: The Design Of Fast-actuating Magneto-responsive Bistable Str...mentioning

confidence: 99%

Magneto‐Responsive Bistable Structures with Rate‐Dependent Actuation Modes

Perez‐Garcia,

Aranda‐Ruiz,

Lopez‐Donaire

et al. 2024

Adv Funct Materials

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“…where µ 0 is the vacuum permeability (4 π × 10 −7 H/m . µ r MRE and µ r core are, respectively, the relative magnetic permeability of the MRE and steel core materials, the values of which are assumed to be around 3 and 1000, respectively [28]. Using Figure 7b, the length of the steel core, l core , and MRE, l MRE , can be evaluated as follows:…”

Section: Design Optimization Of Mre-based Vibration Isolatormentioning

confidence: 99%

Development of a Novel Magneto-Rheological Elastomer-Based Semi-Active Seat Suspension System

Wang,

Vatandoost,

Sedaghati

2023

Vibration

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Human operators in the transportation sector are exposed to whole-body vibration (WBV) while driving. Occupational exposure to WBV, predominant at low frequencies (<20 Hz), has been linked to spinal injuries and reduced functioning. This study aims at the design development of a novel semi-active seat suspension system featuring magneto-rheological elastomers (MREs) to mitigate the WBV. The proposed suspension system allows a greater range of strokes, while ensuring the MRE remains within an acceptable level of deformation. Several MRE samples were fabricated and characterized under shear mode. Afterward, a field- and frequency-dependent phenomenological model was developed to predict the viscoelastic properties of MREs as functions of both the excitation frequency and applied magnetic field. The MRE material model was subsequently used to design and optimize an adaptive seat suspension system incorporating a C-shaped MRE-based isolator in parallel and series with passive springs. The proposed adaptive seat suspension system demonstrated a frequency shift of 29% by increasing the applied current from 0 to 2 A. Finally, a 6-DOF lumped parameter model of a seated human subject combined with the proposed semi-active suspension system featuring the MRE isolator has been formulated to investigate the vibration transmissibility from the floor to the subject’s head.

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“…[19][20][21] At a certain level of magnetic field intensity, the relative permeability remains unchanged; however, with increasing the magnetic field intensity, the relative permeability decreases. [22] A phenomenological model has been recently developed by Vatandoost et al [23,24] to predict the permeability of anisotropic and isotropic MREs under a wide range of applied prestrain, magnetic field intensity, and particle volume fractions. It has been concluded that the relative magnetic permeability of both types of MREs increases with an increase in prestrain and particle volume fraction, while decreasing with an increase in magnetic field intensity, and typically becomes saturated at high magnetic field intensities.…”

Section: Introductionmentioning

confidence: 99%

The Modeling of Magnetorheological Elastomers: A State‐of‐the‐Art Review

Saber

2023

Adv Eng Mater

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The magnetorheological elastomers (MREs) are novel multifunctional materials wherein their viscoelastic properties can be varied instantly under an application of applied magnetic field. Due to their field‐dependent stiffness and damping properties, MREs are widely used in the development and design of MRE‐based adaptive vibration isolators and absorbers and also biomedical engineering. Moreover, MREs due to their inherent magnetostriction effect have enormous potential for the development of soft actuators. The dynamic behavior of MREs is affected by various material parameters (e.g., matrix and particle types, particle concentration, additives) as well as mechanical and magnetic loading parameters (e.g., frequency, amplitude, temperature, magnetic flux density). Understanding and predicting the effect of materials and loading parameters on the response behavior of MREs are of paramount importance for the design of MRE‐based adaptive structures and systems. This review paper mainly aims to provide a comprehensive study of material constitutive models to predict the nonlinear magnetomechanical behavior of MREs. Particular emphasis is paid to physics‐based models including continuum‐ and microstructure‐based models. Moreover, phenomenological models describing the dynamic magnetoviscoelastic behavior of MREs as well as the effect of temperature on the magnetomechanical behavior of such materials are properly addressed.

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A novel methodology for accurate estimation of magnetic permeability of magnetorheological elastomers

Cited by 10 publications

References 45 publications

Magneto‐Responsive Bistable Structures with Rate‐Dependent Actuation Modes

Magneto‐Responsive Bistable Structures with Rate‐Dependent Actuation Modes

Development of a Novel Magneto-Rheological Elastomer-Based Semi-Active Seat Suspension System

The Modeling of Magnetorheological Elastomers: A State‐of‐the‐Art Review

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