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Magnetorheological response of highly filled magnetoactive elastomers from perspective of mechanical energy density: Fractal aggregates above the nanometer scale?

  • The dynamic shear modulus of magnetoactive elastomers containing 70 and 80 mass % of carbonyl iron microparticles is measured as a function of strain amplitude via dynamic torsion oscillations in various magnetic fields. The results are presented in terms of the mechanical energy density and considered in the framework of the conventional Kraus model. The form exponent of the Kraus model is further related to a physical model of Huber et al. [Huber et al., J. Phys.: Condens. Matter 8, 409 (1996)] that uses a realistic representation for the cluster network possessing fractal structure. Two mechanical loading regimes are identified. At small strain amplitudes the exponent beta of the Kraus model changes in an externally applied magnetic field due to rearrangement of ferromagnetic-filler particles, while at large strain amplitudes, the exponent beta seems to be independent of the magnetic field. The critical mechanical energy characterizing the transition between these two regimes grows with the increasing magnetic field. Similarities between agglomeration and deagglomeration of magnetic filler under simultaneously applied magnetic field and mechanical shear and the concept of jamming transition are discussed. It is proposed that the magnetic field should be considered as an additional parameter to the jamming phase diagram of rubbers filled with magnetic particles.

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Metadaten
Author:Vladislav V. Sorokin, Inna A. Belyaeva, Mikhail Shamonin (Chamonine)ORCiDGND, Elena Yu Kramarenko
DOI:https://doi.org/10.1103/PhysRevE.95.062501
Parent Title (English):Physical Review E
Publisher:Amer Physical Soc
Document Type:Article
Language:English
Year of first Publication:2017
Release Date:2022/04/05
Tag:BEHAVIOR; MAGNETIC-FIELD; MODEL; RHEOLOGY; RUBBER; SENSITIVE ELASTOMERS; VISCOELASTIC PROPERTIES; composites; hysteresis
Volume:95
Issue:6
Article Number:062501
Institutes:Fakultät Elektro- und Informationstechnik
Fakultät Elektro- und Informationstechnik / Labor Intelligente Materialien und Strukturen
Begutachtungsstatus:peer-reviewed
research focus:Energie und Mobilität
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG