西安建筑科技大学学报(自然科学版)

利用ANSYS有限元模拟软件,结合力 - 磁耦合关系,分别模拟三种放置方式下,试件沿轴转动时初始状态和屈服后的法向和切向磁信号.对比得出以下结论:首先,当地磁场与试件加载方向不平行或与检测面出现夹角时,法向磁信号相比切向磁信号更为准确.地磁场方向对屈服后试件的影响要比初始状态大,尤其在缺陷附近应力集中区域.其次,当试件不是正南正北放置,而是东西放置或者与地磁场存在一定夹角时,按原来方向的法向和切向信号判断试件应力集中将不再准确,因此找到此时磁场方向下试件表面的法向和切向磁信号是做出准确检测的前提条件.另外,当大地磁场完全垂直于试件表面时,无论切向还是法向磁信号都基本为一直线,只有在缺陷处有些许变化,原来过零点和极大值的现象都不再出现.所以在实际工程中,要尽可能避免试件检测面与大地磁场完全垂直,否则以法向信号过零点和切向信号极大值为依据的经验判断方法将不再适用.

The normal and tangential magnetic signals of the specimen at initial state and yield state have been simulated by using ANSYS finite element simulation software, combining with the relationship of magneto-mechanical coupling when placed at three ways as well as rotating along the axis. The conclusions are as follows by comparison. Firstly, when the geomagnetic field hasn't paralleled with the loading direction of specimen or has included angles with inspection face, normal magnetic signals are more accurate compared with tangential magnetic signals. The influence of geomagnetic field direction on specimen at yield state is bigger than that at initial state, especially at the stress concentration zone of defects. Secondly, when the specimen isn't placed in a south-north direction, whereas in a east-west direction it has included angles with the geomagnetic field, the normal and tangential magnetic signals of original direction cannot be used to judge the stress concentration of specimen accurately, so the precondition of accurate testing is finding the normal and tangential magnetic signals of the specimen at this direction of magnetic field.Finally, when the geomagnetic field is absolutely perpendicular to the surface of specimen, whether the normal or tangential magnetic signal is basically a line, or it only changes in defects, so the original phenomenon like zero crossing point(ZCP)and maximum value don't appear. Therefore, it should be avoided that the testing face of specimen is absolutely perpendicular to geomagnetic field in practical engineering, otherwise the experience judgment way based on ZCP of normal magnetic signal and maximum value of tangential magnetic signal cannot be used.

引言
1 基本理论
2 力 - 磁耦合效应模拟
3 模拟结果及分析
4 结论

表1 试件基本参数<br/>Tab.1 Basic parameters of the specimen

表1 试件基本参数
Tab.1 Basic parameters of the specimen

图1 试件尺寸详图<br/>Fig.1 The size of specimenANSYS

图1 试件尺寸详图
Fig.1 The size of specimenANSYS

图2 力 - 磁耦合流程图<br/>Fig.2 The follow charts of magneto-mechanical coupling

图2 力 - 磁耦合流程图
Fig.2 The follow charts of magneto-mechanical coupling

图3 ANSYS有限元模型<br/>Fig.3 ANSYS finite element model

图3 ANSYS有限元模型
Fig.3 ANSYS finite element model

图4 试件三种放置方式<br/>Fig.4 The three placing ways of specimen

图4 试件三种放置方式
Fig.4 The three placing ways of specimen

表2 第一种放置方式下不同转动角度所对应地磁场矫顽力<br/>Tab.2 The coercive force of earth magnetic in different rotation angles at first placing way

表2 第一种放置方式下不同转动角度所对应地磁场矫顽力
Tab.2 The coercive force of earth magnetic in different rotation angles at first placing way

表3 第二种放置方式下不同转动角度所对应地磁场矫顽力<br/>Tab.3 The coercive force of earth magnetic in different rotation angles at second placing way

表3 第二种放置方式下不同转动角度所对应地磁场矫顽力
Tab.3 The coercive force of earth magnetic in different rotation angles at second placing way

表4 第三种放置方式下不同转动角度所对应地磁场矫顽力<br/>Tab.4 The coercive force of earth magnetic in different rotation angles at third placing way

表4 第三种放置方式下不同转动角度所对应地磁场矫顽力
Tab.4 The coercive force of earth magnetic in different rotation angles at third placing way

图5 第一种放置方式下磁记忆信号分布<br/>Fig.5 The magnetic memory signal distribution in first placing way

图5 第一种放置方式下磁记忆信号分布
Fig.5 The magnetic memory signal distribution in first placing way

图6 第二种放置方式下磁记忆信号分布<br/>Fig.6 The magnetic memory signal distribution in second placing way

图6 第二种放置方式下磁记忆信号分布
Fig.6 The magnetic memory signal distribution in second placing way

图7 试件东西放置时沿z方向的磁信号<br/>Fig.7 The magnetic signals of specimen along z direction when placed at the east-west direction

图7 试件东西放置时沿z方向的磁信号
Fig.7 The magnetic signals of specimen along z direction when placed at the east-west direction

图8 第三种放置方式下磁记忆信号分布<br/>Fig.8 The magnetic memory signal distribution in third placing way

图8 第三种放置方式下磁记忆信号分布
Fig.8 The magnetic memory signal distribution in third placing way

[1] DOUBOV A A. A study of metal properties using the method of magnetic memory[J]. Metal Science and Heat Treatment, 1997, 39(9/10): 401-402.
[2] DOUBOV A A. Screening of weld quality using the magnetic metal memory effect[J]. Welding in The World, 1998, 41: 196-198.
[3] DOUBOV A A. Development of a metal magnetic memory method[J]. Chemical and Petroleum Engineering, 2002, 47(11/12): 837-839.
[4] IVANOV P A, ZHANG V, YEOH C H, et al. Magnetic flux leakage modeling for mechanical damage in transmission pipelines[J]. IEEE Transactions on Magnetics, 1998, 34(5): 3020-3023.
[5] 任吉林, 舒铭航, 伍家驹, 等. 18CrNi4A钢力 - 磁效应的ANSYS模拟[J]. 材料工程, 2001(11): 40-44.
[6] 姚凯, 王正道, 邓博, 等. 金属磁记忆技术的数值研究[J]. 工程力学, 2011, 28(9): 218-222.
[7] YAO Kai, DENG Bo, WANG Zhengdao. Numerical studies to signal characteristics with the metal magnetic memory-effect in plastically deformed samples[J]. NDT&E International, 2012, 47: 7-17.
[8] YAO Kai, SHEN Kai, WANG Zhengdao,et al. Three-dimensional finite element analysis of residual magnetic field for ferromagnets under early damage[J]. Journal of Magnetism and Magnetic Materials, 2014, 354: 112-118.
[9] REN Shangkun, FU Renzheng, LI Xinlei, et al. Influence of environmental magnetic field on stress-magnetism effect for 20 steel ferromagnetic specimen[J]. Insight-Non-Destructive Testing and Condition Monitoring, 2009, 51(12): 672-675.
[10]高庆敏, 丁红胜, 刘波. 金属磁记忆信号的有限元模拟与影响因素[J]. 无损检测, 2015, 37(6): 86-91.
[11]苏三庆, 高波, 王威, 等. 建筑钢板件力磁效应的ANSYS有限元模拟研究[J]. 西安建筑科技大学学报(自然科学版), 2016, 48(6): 771-775.
[12]徐滨士, 董丽红. 再制造质量控制中的金属磁记忆检测技术[M]. 北京: 国防工业出版社, 2015: 3-4.
[13]苏三庆, 马小平, 王威, 等. 基于ANSYS有限元模拟的钢丝绳单丝拉伸力 - 磁耦合研究[J]. 西安建筑科技大学学报(自然科学版), 2017, 49(3): 309-316, 331.
[14]任吉林, 林俊明. 电磁无损检测[M]. 北京: 科学出版社, 2008: 377-378.
[15]IORDACHE V E, HUG E, BUIRON N. Magneticbehavior versus tensile deformation mechanisms in a non-oriented Fe-(3wt.%)Si steel [J]. Materials Science and Engineering, 2003, A359: 62-74.

备注

引言

1 基本理论

2 力 - 磁耦合效应模拟

3 模拟结果及分析

4 结论

期刊信息