Stress effects on the multidirectional magnetic behaviour of grain-oriented silicon iron sheets

Stress evaluation in non-oriented electrical steel samples by observation of vector magnetic flux under static and rotating field conditions

“…Considering the results presented in this paper the usability of the proposed in situ method allowing evaluation of local material changes was confirmed. Reported in [1,3,4] high impact of loading forces having values even significantly below an elastic limit researched using stationary systems was also observed by the authors in case of both proposed NDT methods. Further analysis of the parameters' distribution utilizing statistical algorithms allowed to carry out the quantitative evaluation of stress subjected samples.…”

“…The multiaxis inspection results allowed to evaluate the areas of the greatest material changes such as high stress concentration or plastic deformation. The examination of influence of the stress on magnetic properties using stationary laboratory system were carried out by various authors [1][2][3][4][5]. Considering the results presented in this paper the usability of the proposed in situ method allowing evaluation of local material changes was confirmed.…”

“…In this manner local stress concentration can not only cause beginning of the degradation process but significant change of magnetic properties [1][2][3][4][5]. As a consequence, it is important to evaluate the local stress distribution of steel which is to be used during the production.…”

Magnetic annealing under combined field and magnetostriction of grain-oriented electrical steels

“…2a that LDMA did not result in a noticeable modification of the dependence of λ on applied stress. This outcome was predictable (on the basis of analysis of the literature data 3–5) and it can be explained taking into account the effect of insulation and tension coating, forming on the surface of commercial GO Si steels during industrial processing 1, 2, 5. However, TDMA has resulted in a serious modification of the stress‐dependence of magnetostriction.…”

“…The quality of grain‐oriented (GO) electrical steels is very important for modern industry. It is known that magnetostriction of GO Si steels strongly influences the audible noise, emitted by large power transformers or electric machines 1, 2. In this research a special magnetic annealing procedure has been used to modify the magnetostriction of 3%Si steels possessing different degrees of (110)1 crystalline texture.…”