Effect of magnetic-field-induced restructuring on the elastic properties of magnetoactive elastomers

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:517

Article

Snarskii, Andrei A.^1,2  Shamonin, Mikhail³  Yuskevich, Pavel¹ 

[1] Natl Tech Univ Ukraine, Igor Sikorsky Kyiv Polytech Inst, Prospekt Peremohy 37, UA-03056 Kiev, Ukraine

[2] NAS Ukraine, Inst Informat Recording, Mykoly Shpaka St 2, UA-03113 Kiev, Ukraine

[3] Ostbayer Tech Hsch OTH Regensburg, East Bavarian Ctr Intelligent Mat EBACIM, Seybothstr 2, D-93053 Regensburg, Germany

关键词: Magnetorheological effect;    Magnetoactive elastomer;    Effective medium theory;    Shear modulus;    Poisson's ratio;    Random heterogeneous medium;   

DOI  :  10.1016/j.jmmm.2020.167392

来源: Elsevier

【 摘 要 】

Composite materials where magnetic micrometer-sized particles are embedded into a compliant polymer matrix are known as magnetorheological (or magnetoactive) elastomers (MAEs). They are distinguished by huge variations in their physical properties, when in a magnetic field, which is commonly attributed to the restructuring of the filler. The process of the magnetic-field-induced restructuring in a magnetorheological elastomer is interpreted as progression towards percolation. Such a physical model was previously used to explain the dependence of the magnetic permeability and dielectric permittivity of MAEs on the magnetic field strength. Based on this hypothesis, the magnetorheological effect in MAEs is considered theoretically. The theoretical approach is built upon a self-consistent effective-medium theory for the elastic properties, extended to the variable (field dependent) percolation threshold. The proposed model allows one to describe the large variations (over several orders of magnitude) of the effective elastic moduli of these composite materials, known as the giant magnetorheological (MR) and field-stiffening effects. The existence of a giant magnetic Poisson effect is predicted. The relation of the proposed model to the existing theories of the MR effect in MAEs is discussed. The results can be useful for applications of MAEs in magnetic-field-controlled vibration dampers and isolators.

【 授权许可】

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