Magnetostriction in elastomers with mixtures of magnetically hard and soft microparticles: effects of nonlinear magnetization and matrix rigidity
- Author(s)
- Oleg V. Stolbov, Pedro A. Sánchez, Sofia S. Kantorovich, Yuriy L. Raikher
- Abstract
In this contribution, a magnetoactive elastomer (MAE) of mixed content, i.e., a polymer matrix filled with a mixture of magnetically soft and magnetically hard spherical particles, is considered. The object we focus on is an elementary unit of this composite, for which we take a set consisting of a permanent spherical micromagnet surrounded by an elastomer layer filled with magnetically soft microparticles. We present a comparative treatment of this unit from two essentially different viewpoints. The first one is a coarse-grained molecular dynamics simulation model, which presents the composite as a bead-spring assembly and is able to deliver information of all the microstructural changes of the assembly. The second approach is entirely based on the continuum magnetomechanical description of the system, whose direct yield is the macroscopic field-induced response of the MAE to external field, as this model ignores all the microstructural details of the magnetization process. We find that, differing in certain details, both frameworks are coherent in predicting that a unit comprising magnetically soft and hard particles may display a nontrivial reentrant (prolate/oblate/prolate) axial deformation under variation of the applied field strength. The flexibility of the proposed combination of the two complementary frameworks enables us to look deeper into the manifestation of the magnetic response: with respect to the magnetically soft particles, we compare the linear regime of magnetization to that with saturation, which we describe by the Fröhlich-Kennelly approximation; with respect to the polymer matrix, we analyze the dependence of the reentrant deformation on its rigidity.
- Organisation(s)
- Research Platform MMM Mathematics-Magnetism-Materials, Computational and Soft Matter Physics
- External organisation(s)
- Russian Academy of Sciences, Ural Federal University, Wolfgang Pauli Institute (WPI) Vienna
- Journal
- Physical Sciences Reviews
- Volume
- 7
- Pages
- 1187-1208
- No. of pages
- 22
- ISSN
- 2365-659X
- DOI
- https://doi.org/10.1515/psr-2020-0009
- Publication date
- 2020
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103023 Polymer physics, 103017 Magnetism
- Keywords
- ASJC Scopus subject areas
- General Physics and Astronomy, General Chemistry, General Materials Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/f4b8fc98-8ae7-4953-a4ff-ad0e0ae7ccf2