Selected magnetomechanical properties of magnetorheological elastomers with thermoplastic matrices
Jerzy Kaleta, Michał Królewicz, Daniel Lewandowski, Michał Przybylski, Piotr Zając
Quarterly No. 3, 2012 pages 210-215
DOI:
keywords: smart magnetic materials, magnetomechanical cross-effects, viscoelastic model, magnetorheological composites
abstract The goal of the paper is to present the process of preparing magnetorheological composite materials with thermoplastic matrices called magnetorheological elastomers (MRE) and the possibilities of modelling them using Kevin-Voight relations. At the beginning, the MRE components are presented: a specific thermoplastic elastomer matrix material and ferromagnetic fillers. Both polymer and iron particles are mixed together in specific proportions on the basis of of calculations of the Critical Particle Volume Concentration. Moreover, the method of mixing and the process parameters are described in this paper as they are crucial to achieve the desired structure of the composite. The next important step in testing the MR elastomer is preparation of the sample. At the beginning, the material samples are cut and mounted in such away as to be able to test the influence of magnetic and mechanical fields. Such material is cut into pieces and glued between claddings that support it during testing. The material is put simultaneously under the influence of a high temperature and pressure in a magnetic field in order to achieve an anisotropic structure. Tests performed on a hydraulic pulsator MTS allowed us to expose the MRE to various conditions, which gives better understanding of the behaviour of the material. On the basis of the results, it is possible to observe the viscous and elastic properties of the material and thanks to that, model it and simulate its behaviour, which is presented at the end of this paper.