摘要
针对核电站结构的塑性变形损伤,为研究低碳钢材料塑性变形对增量磁导率信号的影响机理,将B-H曲线的特征量导入数值计算中,间接分析塑性变形对增量磁导率信号曲线的影响规律,开发了基于退化磁矢位法的增量磁导率数值计算程序,并采用数值模拟方法研究了材料剩磁和矫顽力两个因素分别对增量磁导率信号曲线的影响。结果表明,材料剩磁和矫顽力会影响增量磁导率信号曲线的峰峰距、峰值和过零点等特征参数。研究结果对塑性变形的定量无损评价具有参考意义。
Concerning the plastic deformation of carbon steel used in nuclear power plants,in order to investigate the influence mechanism of plastic deformation on the signals of magnetic incremental permeability,the characteristic quantities of B-H curve was adopted into the simulation to indirectly analyze the influence mechanism of plastic deformation on signal curves of magnetic incremental permeability.Simulation program was developed based on the reduced magnetic vector potential method,and the influences of residual magnetism and coercivity on magnetic incremental permeability signal curves were investigated by numerical simulation. The results indicate that the residual magnetism and coercivity may affect the peak separation,peak value and zero crossing of magnetic incremental permeability signal curve,which has reference value for the quantitative nondestructive evaluation of plastic deformation.
作者
李丽娟
解社娟
陈洪恩
陈玲莉
何曼如
陈振茂
LI Lijuan;XIE Shejuan;CHEN Hong＇en;CHEN Lingli;HE Manru;CHEN Zhenmao(State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi＇an Jiaotong University,Xi＇an,710049;Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation,Xi＇ an Jiaotong University,Xi＇ an,710049;Science and Technology on Reactor System Design Technology State Key Laboratory,Nuclear Power Institute of China,Chengdu,610041)
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2018年第14期1653-1660,共8页
China Mechanical Engineering
基金
国家重点研发计划资助项目(2017YFF0209703)
国家自然科学基金资助项目(51407132
51577139)
中央高校基本科研业务费专项资金资助项目
关键词
增量磁导率
无损评价
塑性变形
剩磁
矫顽力
magnetic incremental permeability
nondestructive evaluation
plastic deformation
residual magnetism
coercivity
