基于Kp微扰算法的磁场中MMM信号特征的研究

发布时间：2019-01-08 08:58

【摘要】：金属磁记忆(MMM)法可以对铁磁性金属构件微观损伤区域进行早期预判和评估,但是磁记忆信号很容易受到外界强磁场的干扰,给检测结果带来偏差。为研究磁场强度对磁记忆信号的影响规律,采用Kp微扰算法,在K空间,通过有效玻尔磁子数p建立多元超原胞磁力学模型,计算在外界磁场作用下,磁力学定量变化关系。研究结果表明,在外界磁场作用下,电子轨道运动增强,晶格结构发生畸变,原子磁矩增大。当磁场较小时,磁记忆信号随外界磁场强度增大而线性增大;当磁场强度达到临界值时,原子磁矩近似等于独立原子的磁矩,磁记忆信号趋于定值;当磁场强度大于临界值以后,应力集中区的磁记忆信号将被磁场覆盖。磁记忆检测实验结果与理论分析结果具有很好的一致性。
[Abstract]:The metal magnetic memory (MMM) method can be used to predict and evaluate the microcosmic damage area of ferromagnetic metal components in early stage, but the magnetic memory signal is easily disturbed by the strong magnetic field, which leads to the deviation of the detection results. In order to study the effect of magnetic field intensity on magnetic memory signal, a multivariate supercell magnetomagnetic model was established in K space by using Kp perturbation algorithm and effective Bohr magneton number p, and the quantitative change of magnetic force was calculated under the action of external magnetic field. The results show that under the action of external magnetic field, the electron orbit motion is enhanced, the lattice structure is distorted, and the atomic magnetic moment is increased. When the magnetic field is small, the magnetic memory signal increases linearly with the increase of the external magnetic field intensity, and when the magnetic field intensity reaches the critical value, the atomic magnetic moment is approximately equal to the magnetic moment of the independent atom, and the magnetic memory signal tends to be fixed. When the magnetic field intensity is greater than the critical value, the magnetic memory signal in the stress concentration region will be covered by the magnetic field. The experimental results of magnetic memory testing are in good agreement with the theoretical analysis results.
【作者单位】：沈阳工业大学信息科学与工程学院;中石油西气东输甘陕管理处;
【基金】：国家重大科学专项(2012YQ090175) 国家自然科学基金(61372019,61571308) 辽宁省教育厅项目(L2015388)资助
【分类号】：TG115.284

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