Abstract
Numerical method based on the Cosserat continuum theory is proposed for simulation of a magnetic powder in an applied magnetic field. The Maxwell stress is induced in the magnetic powder. During powder forming process in the magnetic field, the magnetic particles are thus rotated and transferred by both mechanical and magnetic interaction. To simulate this powder behavior, new finite element method considering Maxwell is formulated on the basis of the Cosserat continuum theory of compressible plasticity. The powder behavior with magnetic alignment during compaction in magnetic field is simulated by the proposed method to discus the effect of couple-stress on the powder behaviour. The relationship between the direction of magnetic field and the compaction process can be also analyzed: difference of magnetization in cross compaction, transverse compaction and isostatic compaction. In the calculation, the directions of the easy axes are given by a set of random numbers. The rotation of the axes is thus calculated at various conditions of applied magnetic field. The results are discussed comparing with those by particle dynamics simulation.
