Quantitative analysis on triaxial weak magnetic stress detection signal under external magnetic field
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摘要: 从微观角度量化分析了外磁场作用对铁磁性材料磁力学特性的影响因素,计算了不同方向及强度的外磁场下,铁磁性材料三轴弱磁信号的检测特性,并进行了系统的试验研究。试验结果表明:磁畴自发磁化强度矢量趋于应力方向重新排列产生弱磁信号;弱磁信号在轴向具有峰值,径向具有峰-峰值,且过零点,周向呈不规律波动;随外磁场强度的增强,弱磁信号增大,但增大幅度逐渐减小,外磁场对弱磁信号的影响趋于饱和;外界磁场对其垂直方向的弱磁信号影响程度微弱。Abstract: This paper quantitatively analyzes the influence factors of the magnetic properties of the ferromagnetic material under the external magnetic field from a microscopic point of view, and calculates the three-axis weakening of the ferromagnetic material under the external magnetic field of different directions and strengths. The detection characteristics of the magnetic signal are studied and the system experiments are carried out. The research results show that: the spontaneous magnetization vector of the magnetic domain tends to rearrange in the direction of the stress to produce a weak magnetic signal; the weak magnetic signal has a peak in the axial direction and a peak-to-peak value in the radial direction, and at the zero crossing point, it fluctuates irregularly in the circumferential direction. The intensity of the magnetic field increases and the weak magnetic signal also increases, but the magnitude of the increment gradually decreases, and the influence of the external magnetic field on the weak magnetic signal tends to be saturated; the external magnetic field has a weak influence on the weak magnetic signal in the vertical direction.
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Keywords:
- weak magnetic /
- ferromagnetic /
- magnetic domain /
- finite element
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