基于OLCAO算法金属塑性变形磁记忆信号特征研究

doi:10.3901/JME.2017.22.022

机械工程学报 ›› 2017, Vol. 53 ›› Issue (22): 22-29.doi: 10.3901/JME.2017.22.022

基于OLCAO算法金属塑性变形磁记忆信号特征研究

王国庆^1,2, 杨理践², 闫萍¹, 韦丽娃¹, 刘斌²

1. 辽宁石油化工大学机械工程学院抚顺 113001;
2. 沈阳工业大学信息科学与工程学院沈阳 110870

收稿日期:2017-01-18 修回日期:2017-05-16 出版日期:2017-11-20 发布日期:2017-11-20
通讯作者: 王国庆(通信作者),男,1980年出生,博士。主要研究方向为应力检测技术及相关理论、无损检测技术。E-mail:wangguoqing100110@163.com
作者简介:杨理践,男,1957年出生,教授,博士研究生导师。主要研究方向为长输油气管道内检测技术及相关理论、无损检测技术。E-mail:yanglijian888@163.com
基金资助:
科技部国家重大仪表专项（2012YQ090175）、国家自然科学基金（61571308）和辽宁省教育厅科学研究（L2016009）资助项目。

Study on Magnetic Memory Signal Character of Metal Plastic Deformation Based on OLCAO Algorithm

WANG Guoqing^1,2, YANG Lijian², YAN Ping¹, WEI Liwa¹, LIU Bin²

1. School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001;
2. School of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870

Received:2017-01-18 Revised:2017-05-16 Online:2017-11-20 Published:2017-11-20

摘要/Abstract

摘要： 塑性变形是金属材料在应力作用下产生损伤的早期阶段，对其的有效检测可预判危害的发生，实现设备破坏前的预警。针对金属磁记忆检测技术，利用量子力学密度泛函理论建立铁磁材料力磁耦合计算模型，采用原子轨道正交化线性组合法（Orthogonalized linear combination atomic orbitals，OLCAO）计算铁磁晶体在应力作用下的磁特性变化及磁记忆信号特征。结果表明：应力作用引起晶体内部电子运动状态及其分布特征改变，导致体系能带结构和电子态密度分布发生变化，材料的磁特性发生改变，定量表现为原子磁矩随应力的增加而变化。拉应力导致原子磁矩线性减小，压应力导致原子磁矩线性增大。当金属发生塑性变形时，体系的磁矩均发生突变，应力磁矩关系曲线出现拐点，变化速度变慢，表现为磁记忆信号的特殊变化特征。通过铁磁材料的拉伸及压缩试验，验证了理论计算结果的正确性。

关键词: 磁记忆, 电子运动, 力磁耦合, 塑性变形

Abstract: The plastic deformation is the early damage stage of metal under the stress. It can pre-judge the danger and achieve to early warning for equipment damage through effectively testing plastic deformation. Aimed at metal magnetic memory, force magnetic coupling calculation model of ferromagnetic material is build based on quantum mechanics density functional theory. The orthogonalized linear combination atomic orbitals (OLCAO) algorithm is used to calculate the magnetic characteristic change and magnetic memory signal character of ferromagnetic crystal under different stress. The results show that the stress induces electron motion state and distribution character change inside crystal, and then results in the change of band structure and the density of electron states. Material magnetic characteristic changes. Atomic magnetic moment quantitative changes with stress increase. Tensile stress induces atomic magnetic moment decrease. Compressive stress induces atomic magnetic moment increase. When the plastic deformation of metal emerges, system atomic magnetic moment changes suddenly and the curve appears knee point, as well as change velocity decreases. The special change characters of metal magnetic memory appear. The correctness of theory calculation results is validated by tensile test and compression test of ferromagnetic material.

Key words: electron motion, force magnetic coupling, magnetic memory, plastic deformation

中图分类号:

TH701

王国庆, 杨理践, 闫萍, 韦丽娃, 刘斌. 基于OLCAO算法金属塑性变形磁记忆信号特征研究[J]. 机械工程学报, 2017, 53(22): 22-29.

WANG Guoqing, YANG Lijian, YAN Ping, WEI Liwa, LIU Bin. Study on Magnetic Memory Signal Character of Metal Plastic Deformation Based on OLCAO Algorithm[J]. Journal of Mechanical Engineering, 2017, 53(22): 22-29.

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基于OLCAO算法金属塑性变形磁记忆信号特征研究

Study on Magnetic Memory Signal Character of Metal Plastic Deformation Based on OLCAO Algorithm

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