Effect of a homogeneous magnetic field on the viscoelastic behavior of magnetic elastomers

Степанов, Г. В.; Abramchuk, S. S.; Grishin, D. A.; Nikitin, L. V.; Kramarenko, Elena Yu.; Khokhlov, Alexei R.

doi:10.1016/j.polymer.2006.11.044

Cited by 310 publications

(276 citation statements)

References 9 publications

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“…They consist of superparamagnetic or ferromagnetic particles of nano-or micrometer size embedded in a crosslinked polymer matrix [6]. In this way, they combine the properties of ferrofluids and magnetorheological fluids [7][8][9][10][11][12][13][14][15][16] with those of conventional polymers and rubbers [17]: we obtain elastic solids, the shape and mechanical properties of which can be changed reversibly from outside by applying external magnetic fields [6,[18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Structural control of elastic moduli in ferrogels and the importance of non-affine deformations

Pessot

Cremer

Borin

et al. 2014

The Journal of Chemical Physics

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One of the central appealing properties of magnetic gels and elastomers is that their elastic moduli can reversibly be adjusted from outside by applying magnetic fields. The impact of the internal magnetic particle distribution on this effect has been outlined and analyzed theoretically. In most cases, however, affine sample deformations are studied and often regular particle arrangements are considered. Here we challenge these two major simplifications by a systematic approach using a minimal dipole-spring model. Starting from different regular lattices, we take into account increasingly randomized structures, until we finally investigate an irregular texture taken from a real experimental sample. On the one hand, we find that the elastic tunability qualitatively depends on the structural properties, here in two spatial dimensions. On the other hand, we demonstrate that the assumption of affine deformations leads to increasingly erroneous results the more realistic the particle distribution becomes. Understanding the consequences of the assumptions made in the modeling process is important on our way to support an improved design of these fascinating materials.

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Section: Introductionmentioning

confidence: 99%

Structural control of elastic moduli in ferrogels and the importance of non-affine deformations

Pessot

Cremer

Borin

et al. 2014

The Journal of Chemical Physics

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“…Also, results, in [2] have shown that an MRE with iron by volume, 35 %, has largest MR effect and frequency changes are 183%, 473% and 510% in shear, longitudinal and squeeze mode respectively. Stepanov et all [5] introduced the tangential Young's modulus for describing the no-linear behavior of a new MRE and show that the maximum increase in the modulus is up to 100 times. These results are a hint that besides increasing MR effect, the ATVAs' frequency bandwidth could be broadened if suitable operating modes such as squeeze or shear-squeeze mode are used instead of simple shear mode only.…”

Section: Introductionmentioning

confidence: 99%

A Novel Dynamic Absorber Using Enhanced Magnetorheological Elastomers for Powertrain Vibration Control

Zhang

Hoang

2008

AMR

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This paper presents a novel Adaptive Tuned Vibration Absorber (ATVA) using the enhanced magnetorheological elastomers (MREs) for powertrain vibration reduction. The MRE material used in this application includes micro-sized iron particles enhanced by adding nano-sized magnetic powders. With the enhancement, MRE's elastic modulus significantly increases due to the MR effect. In the new ATVA, the MRE plays a role as a torsional spring whose stiffness coefficient can be varied with an external magnetic field. Additionally, this ATVA could operate in shear-squeeze mode rather than shear mode. Thus, the frequency range is much wider than that of general MREs. Such property of the enhanced MRE is an advantage for constructing a smart ATVA for powertrain vibration control because the ATVA can work effectively in a wide frequency range instead of a narrow bandwidth as a conventional dynamic absorber does. Numerical simulations of a powertrain system for the second and third gear fitted with the ATVA are used to validate its effectiveness. The obtained results show that the powertrain vibration can be greatly suppressed. Particularly, the ATVA is effective in reducing the powertrain vibration not only in case of the single harmonic excitation but also for the case of the multi-harmonic excitation. Furthermore, the simulation results can be used to optimize the ATVA's design, which will be our next work. Abstract. This paper presents a novel Adaptive Tuned Vibration Absorber (ATVA) using the enhanced magnetorheological elastomers (MREs) for powertrain vibration reduction. The MRE material used in this application includes micro-sized iron particles enhanced by adding nano-sized magnetic powders. With the enhancement, MRE's elastic modulus significantly increases due to the MR effect. In the new ATVA, the MRE plays a role as a torsional spring whose stiffness coefficient can be varied with an external magnetic field. Additionally, this ATVA could operate in shearsqueeze mode rather than shear mode. Thus, the frequency range is much wider than that of general MREs. Such property of the enhanced MRE is an advantage for constructing a smart ATVA for powertrain vibration control because the ATVA can work effectively in a wide frequency range instead of a narrow bandwidth as a conventional dynamic absorber does. Numerical simulations of a powertrain system for the second and third gear fitted with the ATVA are used to validate its effectiveness. The obtained results show that the powertrain vibration can be greatly suppressed. Particularly, the ATVA is effective in reducing the powertrain vibration not only in case of the single harmonic excitation but also for the case of the multi-harmonic excitation. Furthermore, the simulation results can be used to optimize the ATVA's design, which will be our next work.

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“…c 1 and c 2 , determine the elastic properties of the polymer matrix and are directly connected with its shear modulus G. To pass to dimensionless units, we introduce parameterc 2 = c 2 /c 1 and elastic energyŨ el (q, q 0 ) = U el (l, l 0 )/(c 1 a 3 ). The MREs, which display the highest magnetically induced deformation and stiffening, have small Young moduli (E ≃ 10 − 30 kPa), see for example [11]. Taking that as a reference value, one finds that for a MRE with Young modulus E ∼ 25 kPa the elastic constant c 1 of our model equals to 1.1 kPa for a fixedc 2 = 0.2.…”

Section: Mesoscopic Elementmentioning

confidence: 70%

Elastic properties of magnetorheological elastomer: description with the two-particle mesoscopic model

Biller

Столбов

Raǐkher

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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View the article online for updates and enhancements. Abstract. A pair of magnetizable solid particles embedded in a cylinder made of highelasticity material is considered as a model of a mesoscopic structure element of a magnetorheological elastomer. An applied magnetic field induces ponderomotive interaction of the particles making them to move relative to one another so as to balance the counteracting magnetic and elastic forces. In a certain parameter range, the system exhibits bistability due to which under the increase / decrease of the field, the interparticle distance changes in a hysteretic manner. This behavior has a significant effect on the ability of the mesoscopic element to resist external load. Using the developed two-particle model prone to the magnetomechanical hysteresis, we extend it to the case of a virtually macroscopic sample presenting the latter as a superposition of such elements with distributed interparticle distances. In spite of its simplicity, this scheme in a generally correct way describes the field-induced changes of the internal structure and elastic modulus of the magnetorheological composites. IntroductionMagnetorheological elastomers (MREs) are a special type of smart composites distinguished by their ability for significant shape and elastic properties changes in response to applied magnetic field. Under magnetization, the microparticles of the ferromagnet filler are got coupled by ponderomotive forces that entails a number of interesting effects: magnetically induced deformation and stiffening of MREs, the magnetic shape memory, and others, all of which possessing a substantial practical potential. At the qualitative level, the picture is simple. The applied external field magnetizes the particles and imparts magnetic moments to them. The arising ponderomotive interaction strives to arrange the particles into a spatial structure that corresponds to the minimum of magnetostatic energy. For the particles embedded in a polymer, this tendency is opposed by the elastic restoring forces, which turn up in the MRE matrix as soon as any particle shifts from its initial position. Both experiment [1,2,3] and theory [4,5,6] show that such changes can strongly modify the properties of simulated MRE samples, thus entailing their qualitatively different behavior. The key issue underlying these peculiarities is the magneto-elastic interaction of the particles in a magnetorheological elastomer at the mesoscopic level, i.e., at the scale of the particle size and the interparticle distance.

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Effect of a homogeneous magnetic field on the viscoelastic behavior of magnetic elastomers

Cited by 310 publications

References 9 publications

Structural control of elastic moduli in ferrogels and the importance of non-affine deformations

Structural control of elastic moduli in ferrogels and the importance of non-affine deformations

A Novel Dynamic Absorber Using Enhanced Magnetorheological Elastomers for Powertrain Vibration Control

Elastic properties of magnetorheological elastomer: description with the two-particle mesoscopic model

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