The interaction of magnetorheological elastomers with the permanent magnets

Alekhina, Y.A.; Makarova, L.A.; Kramarenko, E.Y.; Nadzharyan, T.A.; Perov, N.S.

Авторы: Alekhina Yu A., Makarova L.A., Kramarenko E.Yu, Nadzharyan T.A., Perov N.S.
Сборник: Books of abstract 7th Baikal International Conference BICMM 2016 “Magnetic Materials. New technologies"
Тезисы
Год издания: 2016
Место издания: Irkutsk, Russia Irkutsk, Russia
Первая страница: 205
Последняя страница: 206
Аннотация: Magnetorheological elastomers belong to a class of so-called “Smart” or “Intelligent” materials. Under the influence of the environment, namely, the external magnetic field, they are capable of changing their properties, which provides broad application prospects in various fields. There are various projects of devices which operating principles are based on the attraction between the elastomer and a system, which generates the magnetic field. Types of magnetic clips can be constructed using such mechanisms. The exact calculation of the interaction forces at small distances is impossible because of the necessity of taking a huge amount of factors into account. For the determination of the main regularities of the interaction of the elastomer with the magnetic field, a complex experimental investigation is necessary. Simulation was made using COMSOL Multiphysics software. For this investigation, experimental unit based on electronic weigher was developed and gathered. The interaction force of the elastomer with iron particles at the mass concentration 73% and a permanent magnets system was measured.The dependence of the interaction force of the elastomer and cylindrical magnet 3mm and 5mm height on the distance between them (fig. 1) has a hyperbolic shape. The dependence of the force on the distance to the power of -3 is nearly linear which confirms the possibility of description of the permanent magnet field by the dipole moment. The experimental results indicate the viability of the measurement methods, which allow to carry out further experiments with different systems of magnets. The results of the modeling are in agreement with experimental data. The interaction force of the elastomer with two magnets placed on different distances from each other was also measured (Fig. 2). In case of the opposite orientations of magnetic poles,the dependence of the force on the distance between magnets at small distances from the elastomer is more pronounced and nonmonotonic.The force of interaction of the elastomer and the system of three and four magnets in different configurations was also measured (Fig. 3). In case of the parallel orientations of all magnets the interaction force at large distances is more, and at small distances – less, than that in case of alternating poles orientations. The system of parallel magnets can be described by the dipole moment, and the system of alternating magnets can be described by the quadrupole moment, which field decreases rapidly.The results obtained can be used for determination of the parameters of the system, namely, elastomer properties and the magnetic system parameters that are necessary for the certain device, such as magnetic clips for eye surgery.
Добавил в систему: Макарова Людмила Александровна

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