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Coupled Anisotropic Magneto-Mechanical Material Model for Structured Magnetoactive Materials
Article

Large-Scale Shape Transformations of a Sphere Made of a Magnetoactive Elastomer

by *,† and
Laboratory of Physics and Mechanics of Soft Matter, Institute of Continuous Media Mechanics, Ural Branch, Russian Academy of Sciences, 614068 Perm, Russia
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Polymers 2020, 12(12), 2933; https://doi.org/10.3390/polym12122933
Received: 16 November 2020 / Revised: 3 December 2020 / Accepted: 6 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Magnetic Polymer Composites: Design and Application)
Magnetostriction effect, i.e., deformation under the action of a uniform applied field, is analyzed to detail for a spherical sample of a magnetoactive elastomer (MAE). A close analogy with the field-induced elongation of spherical ferrofluid droplets implies that similar characteristic effects viz. hysteresis stretching and transfiguration into a distinctively nonellipsoidal bodies, should be inherent to MAE objects as well. The absence until now of such studies seems to be due to very unfavorable conclusions which follow from the theoretical estimates, all of which are based on the assumption that a deformed sphere always retains the geometry of ellipsoid of revolution just changing its aspect ratio under field. Building up an adequate numerical modelling tool, we show that the ‘ellipsoidal’ approximation is misleading beginning right from the case of infinitesimal field strengths and strain increments. The results obtained show that the above-mentioned magnetodeformational effect should distinctively manifest itself in the objects made of quite ordinary MAEs, e.g., composites on the base of silicone cautchouc filled with micron-size carbonyl iron powder. View Full-Text
Keywords: magnetic polymers; magnetoactive composites; magnetomechanical hysteresis; computer simulation magnetic polymers; magnetoactive composites; magnetomechanical hysteresis; computer simulation
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MDPI and ACS Style

Stolbov, O.; Raikher, Y. Large-Scale Shape Transformations of a Sphere Made of a Magnetoactive Elastomer. Polymers 2020, 12, 2933. https://doi.org/10.3390/polym12122933

AMA Style

Stolbov O, Raikher Y. Large-Scale Shape Transformations of a Sphere Made of a Magnetoactive Elastomer. Polymers. 2020; 12(12):2933. https://doi.org/10.3390/polym12122933

Chicago/Turabian Style

Stolbov, Oleg, and Yuriy Raikher. 2020. "Large-Scale Shape Transformations of a Sphere Made of a Magnetoactive Elastomer" Polymers 12, no. 12: 2933. https://doi.org/10.3390/polym12122933

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