Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: (Hydro)gels and Elastomers
CPP 48.7: Vortrag
Freitag, 15. März 2013, 11:15–11:30, H39
Mechanical properties of magneto-sensitive elastomers: microscopic theory versus continuum-mechanics approach — •Dmytro Ivaneyko1,2, Vladimir Toshchevikov2, Marina Saphiannikova2, and Gert Heinrich1,2 — 1Technische Universität Dresden — 2Leibniz-Institut für Polymerforschung Dresden e.V.
We compare predictions of continuum-mechanics approach and our microscopic theory [1,2] for the mechanical behaviour of magneto-sensitive elastomers (MSEs) under a uniform external magnetic field. The continuum-mechanics approach is based on the calculation of deformation-dependent demagnetization factor and predicts the elongation of MSEs. The microscopic theory explicitly considers the point-like dipole interactions between magnetic particles and gives a different sign of the magnetostriction depending on the spatial distribution of particles [1,2]. Also, the sample shape plays an essential role in the mechanical properties of MSEs. We show that the microscopic theory predicts the same results as continuum-mechanics approach in the case of ellipsoidal MSE samples with isotropic particle distributions. Moreover, the values of demagnetization factor are found to be the same for stochastic and isotropic lattice distributions. They change however considerably for chain-like particle distributions. Generalization of the continuum-mechanics approach for the case of anisotropic particle distributions is currently in progress.
[1] D. Ivaneyko et al., Macromolecular Theory and Simulations 20, 411 (2011).
[2] D. Ivaneyko et al., Condensed Matter Physics 15, 33601(2012).