A numerical study on magnetostrictive phenomena in magnetorheological elastomers
P. Metsch, K. A. Kalina, C. Spieler, M. Kaestner,
Volume: 124. Pages: 364--374
DOI: 10.1016/j.commatsci.2016.08.012
Published: 2016
Abstract
Abstract Herein, we present an investigation on magnetostrictive
phenomena in magnetorheological elastomers. By using a continuum
approach, constitutive as well as geometric properties on the microscale
are taken into account in order to predict the effective behavior
of these composites by means of a computational homogenization. Thus,
the magnetic and mechanical fields are resolved explicitly without
the simplifying assumption of dipoles. In the present work, a modeling
strategy which accounts for elastic constituents and a nonlinear
magnetization behavior of the particles is pursued. In order to provide
a better understanding of fundamental deformation mechanisms, idealized
lattices as well as compact and wavy chains are considered within
a first study. Our results confirm assumptions stated in the literature
according to which macroscopic magnetostriction can be ascribed to
microscopic particle movements that result in an improved microstructure.
The simulations that are performed for the subsequent investigations
on random microstructures with different particle-volume fractions
are evaluated statistically to ensure validity of our findings. They
reveal anisotropic as well as isotropic macroscopic behavior for
structured and unstructured particle distributions, respectively.
In view of the macroscopic magnetostriction, all the results presented
in this contribution are in good agreement with current experimental
and theoretical findings.