摘要
基于漏磁检测原理,针对铁磁性换热管的特点,利用有限元数值模拟方法,建立换热管漏磁检测三维有限元模型;针对提高漏磁场径向分量检测灵敏度,设计了2种聚磁结构(环形聚磁结构和锥形导向聚磁结构)。在此结构条件下,分析了漏磁场磁感应强度径向分量随缺陷深度的变化规律,得到漏磁场相关对比分析曲线。仿真结果表明,采用聚磁结构后,缺陷处测点的磁感应强度增强,其中锥形导向聚磁结构的聚磁效果更好。
In view of the characteristics of ferromagnetic heat - exchange tube, based on the principle of magnetic flux leakage （MFL） testing, use the finite element analysis software, also 3D finite element method （FEM） model for MFL testing of heat -exchange tube was established. Also design two magnetic concentracting structure for sensitivity of increasing magnetic flux leakage testing（ ringshaped magnetic concentracting and taper guiding magnetic concentracting）. Also the laws are obtained representing distribution of the radial component of the magnetic induction density to the change of the depth of crack under the two above structure. After that, the curves are obtained representing distribution of the MFL field. The outcome indicates that magnetic concentracting can build up the density of the crack. MFL on the measure point, and the effect of taper guiding magnetic concentracting is better.
出处
《压力容器》
北大核心
2010年第4期22-26,31,共6页
Pressure Vessel Technology
关键词
聚磁
铁磁性换热管
漏磁检测
有限元
magnetic concentracting
ferromagnetic heat- exchange tube
magnetic flux leakage testing
finite element method
