Magneto-elastic properties of isotropic MR elastomers with a tri-modal particle size distribution

Wei, Gao; Wang, Xingzhe

doi:10.1016/j.polymertesting.2019.106105

Cited by 5 publications

(1 citation statement)

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“…The unique properties of MAEs are of interest when the latter are applied as active dampers allowing a contactless control by means of a magnetic field [29][30][31][32], as stress or strain transducers also controllable by a magnetic field [33], as well as sensors or actuators [34][35][36][37][38]. For robotics [39][40][41][42][43], the shape memory phenomenon in MAEs and the deformations induced in them by magnetic field are of interest.…”

Section: Introductionmentioning

confidence: 99%

Critical bending and shape memory effect in magnetoactive elastomers

Каліта¹,

Dzhezherya²,

Cherepov³

et al. 2021

Smart Mater. Struct.

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The results of a study of magnetoactive elastomers (MAEs) consisting of an elastomer matrix with embedded ferromagnetic particles are presented. A continuous critical bending induced by the magnetic field, characterized by a critical exponent for the bending magnitude, and the derivative of which has a singularity in the critical region is reported for the first time. The mechanical stability loss and the symmetry reduction of the magnetic state, which are interrelated with each other, take place at the critical point. The magnetization in the high-symmetric state (below the critical point) is directed along the magnetic field and the torque is absent. Above the critical point, the magnetization and the magnetic field are noncollinear and there arises a torque, which is self-consistent with the bending. The magnetic field dependence of the MAE bending was found to have a hysteresis, which is associated with the magneto-rheological effect. The shape memory effect was also obtained for the MAE bending in a cycle consisting of magnetization, cooling (at H ≠ 0), and heating (at H = 0). The influence of the critical glass transition temperature of the matrix, as well as its melting/solidification temperature, on the magnetic shape memory effect was studied.

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Section: Introductionmentioning

confidence: 99%

Critical bending and shape memory effect in magnetoactive elastomers

Каліта¹,

Dzhezherya²,

Cherepov³

et al. 2021

Smart Mater. Struct.

View full text Add to dashboard Cite

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Experimental and theoretical investigations on Magnetostrictive stresses of PDMS based magnetorheological elastomer films

Zhang,

Chen,

et al. 2024

Polymer Composites

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This paper demonstrates experimental and theoretical research of the magnetostrictive stresses of the magnetorheological elastomer (MRE) films comprised of PDMS and Fe/Fe3O4 nanoparticles. The MRE films possessing three types of microstructures were formed via imposing an external magnetic field or under no magnetic field during the film preparation, whose nanoparticle weight fractions were in the range of 1–40 wt%. The measurement of the film magnetostrictive stresses was carried out by employing the FLX 2320‐S thin film stress measurement system with a special structure used for applying a homogeneous magnetic field to the samples in the process of testing. The experimental data show that the film magnetostrictive stresses are greatly dependent on the nanoparticle concentration and the film microstructure. The theoretical analysis and numerical simulation were performed to obtain a good understanding of the mechanism and the important influencing factors of the film magnetostrictive stresses. For the isotropic specimens, the calculated values of the film magnetostrictive stresses are in good agreement with the measured values. The research results reported in this work could facilitate the applications of MREs to the micro/nano technology field such as MEMS, small‐scale soft robotics, and so on.Highlights Magnetostrictive stresses of MRE films can be experimentally obtained. Magnetostrictive stress results from magneto‐mechanical coupling. Particle content has an effect on film magnetostrictive stress. Orientation of particle clusters influences film magnetostrictive stress. Size and number of particle clusters affect film magnetostrictive stress.

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