Progress of Magnetic Barkhausen Noise Technique in Stress Evaluation
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摘要: 磁巴克豪森噪声（MBN）技术可以探测铁磁性材料由于应力作用而发生的微观结构变化，进而评估材料受力和失效情况。基于金属磁畴理论和磁化理论，从微观上对MBN现象进行解释，并结合Jiles-Atherton磁化模型定量分析应力对MBN信号的影响，介绍应力作用下金属材料在弹性变形阶段和塑性变形阶段的MBN信号变化特点，分析材料所受载荷压力和残余应力在本质上对材料磁畴结构、晶粒易磁化轴、晶粒各向异性等微观结构的影响，指出应力既会促使材料内部产生缺陷从而阻碍巴克豪森跳跃，也会促进相邻磁畴壁的融合，进而增加巴克豪森跳跃，最终的MBN信号是应力对巴克豪森跳跃阻碍作用和促进作用相互博弈的结果。最后，还总结了MBN技术在应力评估方面的优势、不足及未来可开展的研究方向。Abstract: Microstructure transformation of ferromagnetic material caused by stress can be detected by magnetic Barkhausen noise (MBN) technique,which was a reliable method to estimate the stress condition and failure condition of magnetic material. This paper illustrated the MBN phenomenon based on magnetic domain theory and magnetization theory, and also evaluated the influence of MBN signal caused by stress using the Jiles-Atherton magnetization model. The change characteristic of MBN signal was illustrated when the magnetic material was under the situation of elastic deformation stage and plastic deformation respectively. Moreover, the influence of loading stress and residual stress to microstructure, such as domain structure, easy magnetization axis and anisotropy, was discussed essentially. It was pointed out that the stress would not only cause defects in the magnetic material to decrease Barkhausen jump, but also cause the domain wall merger to increase the Barkhausen jump. Eventually, the final Barkhausen signal was the interaction of the decreased and increased jumps. Furthermore, the superiorities, deficiencies and new research area of MBN stress evaluation technique were summarized.
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Keywords:
- MBN /
- stress evaluation /
- residual stress /
- domain wall structure
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