Influence of a multiaxial stress on the reversible and irreversible magnetic behavior of an iron-silicon alloy

2 pagesThis paper deals with the magnetic behavior of an iron-silicon thin sheet, submitted to biaxial stresses. It is well known that the magnetic behavior of a ferromagnetic material is sensitive to the microstructural state and / or application of a mechanical stress. Indeed, nonconventional experiments were performed on cruciform samples to approach the mechanical stress inside a rotating machines. The test presented in this paper has been carried out on the multiaxial testing machine ASTREE. Magnetic loading is ensured by single U-yoke. Measurements are carried out thanks to needle-B, H-coil sensors and Digital Image Correlation (DIC). Irreversible magnetic behavior is specially considered. Results show a major influence of stress level along the magnetization axis especially on shear case, when applied stresses along orthogonal axis are negative. The effects of biaxial stress on the magnetic dissipative properties of iron-silicon alloy are reported. Iso-stress changes in the coercive field Hc and power loses P are well described experimentally and they follow the same trends of the iso-values as the magnetic susceptibility X