Viscoelastic Properties of Magnetorheological Elastomers for Damping Applications

Молчанов, В.С.; Степанов, Г. В.; Vasiliev, Viktor G.; Kramarenko, Elena Yu.; Khokhlov, Alexei R.; Xu, Zhao‐Dong; Guo, Yingqing

doi:10.1002/mame.201300458

Cited by 51 publications

(53 citation statements)

References 38 publications

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“…Indeed, the loss factor displays a total decrease of 50% on application of a magnetic field of 1000 mT for high frequencies (100 rad s −1 ), and a twofold increase at the same field for low frequencies (1 rad s −1 ). This change in the loss factor with magnetic field is much more significant than that previously reported for composites with magnetic particles dispersed in polymer matrices, and is relevant for applications requiring adaptive vibration damping …”

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confidence: 63%

Magnetically Addressable Shape‐Memory and Stiffening in a Composite Elastomer

et al. 2019

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With a specific stimulus, shape‐memory materials can assume a temporary shape and subsequently recover their original shape, a functionality that renders them relevant for applications in fields such as biomedicine, aerospace, and wearable electronics. Shape‐memory in polymers and composites is usually achieved by exploiting a thermal transition to program a temporary shape and subsequently recover the original shape. This may be problematic for heat‐sensitive environments, and when rapid and uniform heating is required. In this work, a soft magnetic shape‐memory composite is produced by encasing liquid droplets of magneto‐rheological fluid into a poly(dimethylsiloxane) matrix. Under the influence of a magnetic field, this material undergoes an exceptional stiffening transition, with an almost 30‐fold increase in shear modulus. Exploiting this transition, fast and fully reversible magnetic shape‐memory is demonstrated in three ways, by embossing, by simple shear, and by unconstrained 3D deformation. Using advanced synchrotron X‐ray tomography techniques, the internal structure of the material is revealed, which can be correlated with the composite stiffening and shape‐memory mechanism. This material concept, based on a simple emulsion process, can be extended to different fluids and elastomers, and can be manufactured with a wide range of methods.

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confidence: 63%

Magnetically Addressable Shape‐Memory and Stiffening in a Composite Elastomer

et al. 2019

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“…The magnetic moment of each filler particle is represented by m = A I , so the dipole potential can be converted [16] to:…”

Section: Discussionmentioning

confidence: 99%

The Magneto-Mechanical Behavior of Active Components in Iron-Elastomer Composite

2018

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Abstract:The magneto-rheological effects in iron-elastomer composites (IEC) were investigated by simulation, surface topography, and 3D representation. The simulated behavior of magneto-rheological elastomeric composites in the presence of an external magnetic field was determined and the influence of magnetic intensity on the isotropic distribution of iron filler particles in IECs was investigated. The magnetic intensity distribution was analyzed from the edge of the surface towards the center of the IEC. The samples were characterized for microstructural images after experimental tests using both micro-computed tomography (µCT) and scanning electron microscopy (SEM). The adhesion of filler particles within the matrix of the magneto-rheological elastomer (MRE) composite and their distributions were also investigated. µCT showed the overall 3D representation of IEC and the inner distribution of filler particles revealed the presence of some porosity which may be due to bubbles and voids in the matrix of the composite. Finally, a mechanism was established governing particle-particle interactions on the basis of dipole-dipole interactions.

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“…). Due to their high magnetoactivity, these materials are often called magnetoactive elastomers (MAEs) although some other names, such as magnetic elastomers, magnetosensitive elastomers, or magnetorheological (MR) elastomers are also used for the same type of materials, the later particularly emphasizes the ability of the magnetopolymer composites to change their rheological properties under the influence of magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Development of magnetoactive elastomers for sealing eye retina detachments

Alekhina

Makarova

Kostrov

et al. 2018

J of Applied Polymer Sci

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Magnetoactive elastomers (MAEs) on the basis of a silicone matrix filled with carbonyl iron microparticles are developed for an envisaged application in eye surgery for treatment of complicated retinal detachments. The proposed magnetic fixator of an eye retina consists of an MAE seal placed inside an eye in the area of a retinal break, and an external silicone sponge with embedded permanent magnets which can be sutured to the sclera to provide magnetic field acting on the internal MAE seal. For MAE seal development, MAEs of various compositions (containing 52-76 mass% of ferromagnetic iron microparticles) are synthesized and their surface, magnetic, mechanical, and rheological properties are investigated in external magnetic fields. To demonstrate MAEs efficacy as an element of the retina magnetic fixator, magnetic forces acting between MAE samples and systems of permanent magnets were measured in the curved configuration corresponding to the human eye geometry. It has been demonstrated that the pressure produced within the fixator can be varied in a wide range by tuning the MAE composition and MAE seal dimensions as well as by optimizing the size and configuration of permanent magnets within the external silicone sponge.A high magnetic response of MAEs makes them very promising for numerous practical applications. Being a solid analogue to magnetic fluids 20 MAEs can be explored in the areas where magnetic fluids are usually used, in particular, as sealing elements, vibration absorbers, and so forth. Moreover, MAEs have some advantages in comparison with magnetic fluids, in particular, Additional Supporting Information may be found in the online version of this article.

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Viscoelastic Properties of Magnetorheological Elastomers for Damping Applications

Cited by 51 publications

References 38 publications

Magnetically Addressable Shape‐Memory and Stiffening in a Composite Elastomer

Magnetically Addressable Shape‐Memory and Stiffening in a Composite Elastomer

The Magneto-Mechanical Behavior of Active Components in Iron-Elastomer Composite

Development of magnetoactive elastomers for sealing eye retina detachments

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