Influence of Plastic Deformation on Signals of Magnetic Incremental Permeability for Carbon Steel

Abstract

Abstract: 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.

Key words: magnetic incremental permeability, nondestructive evaluation, plastic deformation, residual magnetism, coercivity

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。

关键词: 增量磁导率, 无损评价, 塑性变形, 剩磁, 矫顽力

CLC Number:

TG115.28

LI Lijuan1，2，3;XIE Shejuan1，2;CHEN Hong'en1，2;CHEN Lingli1，2;HE Manru1，2;CHEN Zhenmao1，2. Influence of Plastic Deformation on Signals of Magnetic Incremental Permeability for Carbon Steel[J]. China Mechanical Engineering.

李丽娟1，2，3;解社娟1，2;陈洪恩1，2;陈玲莉1，2;何曼如1，2;陈振茂1，2. 碳钢塑性变形对增量磁导率信号的影响[J]. 中国机械工程.

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