Modeling and properties of inclusions immersed in carrier fluid subjected to external field / Marek Barski // Procedia Engineering [Dokument elektroniczny]. – 2011, Vol. 10, [spec. iss.], s. 1585-1590 ... więcej

Modeling and properties of inclusions immersed in carrier fluid subjected to external field / Marek Barski // Procedia Engineering [Dokument elektroniczny]. – 2011, Vol. 10, [spec. iss.], s. 1585-1590 : rys., tab. – Tryb dostępu: http://www.sciencedirect.com/science/article/pii/S187770581100453X. – Bibliogr. 9 poz., Abstr. – Mat. konf.: ICM11 : 11th International Conference on the Mechanical Behavior of Materials, Como, Italy, 5-9.06.2011. – doi: 10.1016/j.proeng.2011.04.265. – ISSN 1877-7058

The subject of the present work is to determine the effective magnetic permeability of magnetorheological fluids (MR) subjected to the action of an external magnetic field. The anisotropy of the magnetic ... więcej

The subject of the present work is to determine the effective magnetic permeability of magnetorheological fluids (MR) subjected to the action of an external magnetic field. The anisotropy of the magnetic properties is assumed. Thus the effective coefficients of the permeability matrix instead of the single effective value are looked for. The method proposed here consists of two main stages. In the first stage the appropriate representative volume element (RVE) for MR fluid containing formed chains of particles is generated. To this end, the molecular dynamic method is applied. In order to describe the magnetic interactions between particles the modified fixed dipole model is used. For the prepared RVE the effective values of the permeability matrix elements are estimated. The direct numerical homogenization method based on the finite element is used. The calculations are performed for several different values of the volume fraction of particles. In the case of an ordered structure inside the RVE volume the evident anisotropy of magnetic properties is obtained. The value of effective permeability in the direction of the external magnetic field is approximately two times higher than in the perpendicular direction. Moreover, the calculations are repeated in the case when the particles in a MR liquid are “quasi” uniformly spread out inside the RVE volume (“quasi” isotropic state, the external field is switched off). In this case the MR fluid exhibits isotropic properties.