Deformation of magnetic active elastomers in magnetic field

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Abstract

Magnetoactive (aka magnetorheological) elastomer is a composite material consisting of an elastic matrix and magnetic filling substance. A study has been given to the magnetic field-induced deformation of the material. Influenced by non-homogeneous fields, samples of the elastomer have been noticed to exhibit elongations by hundreds of percent. When magnetized, the material filled with magnetically hard particles may exhibit field-induced deformation occurring in a complicated way. In a magnetic field, it reversibly gains a degree of roughness resulting in improved hydrophobicity. In addition, the composite increases in rigidity by tens of percent. Such magnetoactive elastomer may be considered a prospective material to find application in robotics and field-controlled damping units.

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About the authors

G. V. Stepanov

State Research Institute for Chemistry and Technology of Organoelement Compounds

Author for correspondence.
Email: gstepanov@mail.ru
Russian Federation, Moscow

P. A. Storozhenko

State Research Institute for Chemistry and Technology of Organoelement Compounds

Email: gstepanov@mail.ru
Russian Federation, Moscow

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2. Fig. 1. Dependence of the elongation of the sample in a non-uniform magnetic field on the magnitude of the magnetic field on the surface of the electromagnet: 1 - deformation parallel to the direction of structuring (direction A-A, b), 2 - deformation perpendicular to the direction of structuring (direction B-B, b)

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3. Fig. 2. Multipolar magnetization of the MAE strip. Diagram of the magnetization of the MAE strip and photographs of the bending of the magnetized MAE in a magnetic field.

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4. Fig. 3. Changes in surface structure under the influence of a magnetic field. Conditional magnification ×10. The scale of the two images is the same. Initial (a) and in a magnetic field of 100 mT (b). Photograph of a 3D profile of the MAE sample surface without a magnetic field (c) and in a magnetic field of 200 mT (d). Magnification ×500.

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5. Fig. 4. Surface structure after polymerization of liquid MAE film in a magnetic field.

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6. Fig. 5. Dependence of voltage on the relative elongation of MAE without a field (1) and in a magnetic field of different strengths (curves 2–20 mT, 7–270 mT).

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