正磁致伸缩铁磁材料磁记忆现象的理论探讨

The Theoretical Discussion on Magnetic Memory Phenomenon about Positive Magnetostriction Ferromagnetism Materials

针对金属磁记忆无损检测原理,基于铁磁性的唯像理论,利用一个近似的分子场,得到了地磁场中受应力作用的铁磁杆件的有效场表达式;利用能量最小原理,得到了分子场参数表达式;根据所得的有效场表达式,解释了磁致伸缩为正的铁磁材料在应力集中处漏磁场切向分量出现最大值、同时法向分量为零值的现象,并进行了仿真计算.

In this paper, the problem of metal magnetic memory non-destructive testing principle is addressed. A mean field that is based on the phenomenological theory of ferromagnetism is used, and an effective magnetic field expression for ferromagnetic rod with applied stress in the geomagnetic field is derived. Using the principle of the least-energy, the expression of the mean field parameter is derived. According to the effective field expression, the phenomenon that the tangential component of magnetic leakage field has maximum value and the normal component of magnetic leakage field acquires zero value at the stress concentration zone of positive magnetostriction ferromagnetic materials is explained theoretically. Furthermore, a simulation computation is accomplished.