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  2021, Vol. 42 Issue (6): 707-717    
  研究简报 本期目录 | 过刊浏览 | 高级检索 |
地磁场环境下烧结钕铁硼疲劳破坏在线监测方法研究
严毅琪1,孙鹏宇1,殷金泉2,程强强1,夏桂锁1,于润桥1
1. 南昌航空大学
2. 赣州市特种设备监督检验中心
Research on On-line Monitoring Method of Sintered Nd-Fe-B Fatigue Damage in Geomagnetic Field
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摘要 作为一种典型的硬磁材料,烧结钕铁硼在疲劳断裂时具有突发性、不确定性和紧迫性等特性,难以对其疲劳裂纹扩展过程进行在线监测。为了实现对烧结钕铁硼零构件在长期服役期间疲劳破坏全过程的在线监测,本文根据力磁耦合效应构建了地磁场环境下烧结钕铁硼的疲劳状态演变方程,将磁感应强度值作为描述疲劳破坏的状态参数。利用高精度测磁传感器采集微磁信号,通过获取的磁感应强度值对烧结钕铁硼疲劳破坏过程进行在线监测。疲劳试验结果表明:磁感应强度值与多项式拟合曲线残差值变化趋势能够准确地预测烧结钕铁硼疲劳裂纹扩展过程中脆性疲劳断裂的时刻。同时,磁感应信号曲线的变化可以无失真地反映钕铁硼材料在应力作用下产生疲劳破坏的全过程。
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严毅琪
孙鹏宇
殷金泉
程强强
夏桂锁
于润桥
关键词 烧结钕铁硼疲劳破坏应力集中力磁耦合sintered Nd-Fe-B fatigue damage stress concentration coupling of stress and magnetic    
Abstract:Sintered Nd-Fe-B which is a typical hard magnetic material, crises characterized by unexpectedness, uncertainty, and urgency during fatigue cracking. Therefore, it is difficult to monitor its fatigue damage propagation process online. In order to realize the online monitoring the whole process of fatigue damage expansion for sintered Nd-Fe-b during its long-time service, the fatigue state evolution equation of sintered Nd-Fe-B under the geomagnetic field environment is constructed by utilizing coupling effects of stress and magnetic. The magnetic induction value is used as the state parameter to describe the fatigue damage. The magnetic induction intensity of the weak magnetic which is collected by high precision magnetic sensor is used to monitor the fatigue damage prop-agation process online. The fatigue test results show that: it can accurately predict the point of fracture in time during fatigue damage propagation process for sintered Nd-Fe-B by the trends of the magnetic induction intensity value and the residual value of the polynomial fitting curve. Meanwhile, the variation of magnetic induction signal curve reflects the whole process of Nd-Fe-B fatigue damage propagation under stress without distortion.
收稿日期: 2020-12-17      出版日期: 2021-12-14
ZTFLH:  TG146.4+5  
基金资助:国家自然科学基金;国家自然科学基金;国家自然科学基金;江西省自然科学基金;航空智能制造专项;江西省市场监督管理局科技项目
通讯作者: 程强强     E-mail: chengqq@nchu.edu.cn
引用本文:   
严毅琪 孙鹏宇 殷金泉 程强强 夏桂锁 于润桥. 地磁场环境下烧结钕铁硼疲劳破坏在线监测方法研究[J]. , 2021, 42(6): 707-717.
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