Abstract
AbstractIn this article, an experimental procedure is presented to handle magnetic measurements under uniaxial tensile stress reaching the plastic domain. The main advantage of the proposed procedure is that it does not require an additional magnetic core to close the magnetic flux path through the studied sample. The flux flows only in the sample, and no parasitic air gaps are introduced, thus avoiding the use of the H-coil to evaluate the magnetic field, which is often very sensitive and not easy to calibrate. A specimen of nonoriented FeSi (1.3%) sheet (M330-35A) is characterized under uniaxial tensile stress. To validate the proposed procedure, a comparison with the single sheet tester procedure is carried out. The results obtained by the two procedures are in good agreement. Moreover, to illustrate the possibilities offered by the proposed procedure, we confirm some results obtained in the literature. We show that the positive plastic strain leads to a significant degradation of magnetic behavior. An applied tensile stress on a virgin (unstrained) sample leads to a degradation of the magnetic behavior. However, on a pre-strained sample, an applied tensile stress results in reducing the deterioration caused by the plastic strain until a stress value called optimum is attained. Above this threshold, the magnetic behavior re-deteriorates progressively.
Highlights
The behavior of ferromagnetic materials depends on their composition and highly on the mechanical and microstructural properties
We propose an experimental device to characterize the magneto mechanical behavior of ferromagnetic material under uniaxial tensile stress reaching the plastic domain, without requiring an external magnetic yoke to close the magnetic flux path
Once we have the reluctance per unit length of the virgin material (Rv) in function of the magnetic flux and frequency, it is possible to estimate the reluctance per unit length in the middle parts (MP) (Rdi) corresponding to the sample for a mechanical state di, which corresponds to a given stress and plastic strain levels
Summary
The behavior of ferromagnetic materials depends on their composition and highly on the mechanical and microstructural properties. Performances of the electrical machines, e.g. Slinky Stator which is obtained by rolling the lamination continuously, determined during the design stage, are always overestimated These ones are predicted based on the raw material characteristics without considering the degradation due to the manufacturing processes. In order to predict more accurately the performances of electrical machines during the design stage, it is necessary to account for the effect of the manufacturing processes To reach this goal, the relationship between the stress and plastic strain, on the one hand, and magnetic flux density and magnetic field, on the other hand, should be determined. We propose an experimental device to characterize the magneto mechanical behavior of ferromagnetic material under uniaxial tensile stress reaching the plastic domain, without requiring an external magnetic yoke to close the magnetic flux path. We present the results of magnetic measurements performed for different tensile stresses and plastic strains
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