In 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.

中文翻译：

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利用封闭磁通路径样本进行磁机械测量的实验装置

在本文中，提出了一种实验程序来处理在达到塑性域的单轴拉伸应力下的磁性测量。所提出的程序的主要优点是它不需要额外的磁芯来封闭通过研究样品的磁通路径。通量仅在样品中流动，并且不会引入寄生气隙，因此避免了使用H线圈来评估磁场，该磁场通常非常敏感并且不易于校准。非取向FeSi（1.3％）薄板（M330-35A）的样品在单轴拉伸应力下表征。为了验证提出的程序，与单张纸测试仪程序进行了比较。两种方法得到的结果吻合良好。此外，为了说明提议的程序提供的可能性，我们证实了文献中获得的一些结果。我们表明，正塑性应变导致磁性能的显着降低。在原始（未拉伸）样品上施加张应力会导致磁性能下降。然而，在预应变的样品上，施加的拉伸应力导致减小了由塑性应变引起的劣化，直到获得称为最佳的应力值为止。高于此阈值，磁行为会逐渐恶化。施加的拉应力可减少由塑性应变引起的劣化，直到获得称为最佳的应力值为止。高于此阈值，磁行为会逐渐恶化。施加的拉应力可减少由塑性应变引起的劣化，直到获得称为最佳的应力值为止。高于此阈值，磁行为会逐渐恶化。