NUMERICAL CHARACTERIZATION MODEL OF VECTOR HYSTERESIS FOR MAGNETIC MATERIALS
The paper presents a numerical method based on Preisach model for the characterization and modelling of hysteretic magnetic materials exhibiting vector hysteresis, with acceptable accuracy, based on minimal material measurement data. The identification approach based on the Everett distribution function is a way to obtain accurate numerical solutions when the experimental data of the magnetic material are scarce, for instance: there are known only the initial magnetization curve and the upward major branch for two directions (rolling and transverse ones). The comparison between the measured and simulated major loop curves for another magnetization direction shows good agreements.
Accurate analysis of magnetic devices with anisotropic vector hysteresis
Abstract This paper deals with the implementation of an anisotropic vector Preisach model, as proposed by Mayergoyz, and its insertion into a numerical magnetic field solver. A detailed description of the identification procedure of the model is presented. Results obtained on some materials where rotational measurements were available are reported. A good agreement is found between simulated and experimental results. Afterwards, the field formulation and the nonlinearity handling scheme of the finite element magnetic solver are outlined and an example on a test case is discussed.
SR topography of plastically deformed Fe-Si bicrystals - observation in situ and post mortem
SR reflection topography was applied to study the interaction of slip dislocations with the grain boundaries in Fe-4at%Si bicrystals deformed by compression. Three experimental settings with either a white or monochromatic beam were used and the corresponding orientation contrast analysed. Dislocation transmission through the grain boundary was observed in bicrystals with favourable geometry of the slip systems.