Finite Element Simulation in Magnetic Flux Leakage Testing Based on Software ANSYS
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摘要: 通过ANSYS二维电磁场仿真进行漏磁检测的原理验证.采用三维有限元方法分析漏磁场,建立了漏磁检测三维模型,基于ANSYS各种模型求解结果,得出试件无缺陷状态下磁感应分布规律和有缺陷状态下的漏磁场三维各分量的分布规律.同时研究了缺陷几何参数对漏磁场总磁感应强度和轴向分量的影响以及电流强度对漏磁场总磁感应强度的影响.根据ANSYS有限元分析结果,发现测试件端部存在检测盲区.提出了一种在端部添加试件引体的方法来解决端部的检测盲区问题,并用仿真方法验证了试件整体检测的效果.Abstract: The principle of magnetic flux leakage detection is stated.The principle is verified by 2D electromagnetic field simulation based on ANSYS system.Further more,the 3D finite element method is used to analyse leakage magnetic field and 3D model of magnetic flux leakage detection is also established.The distribution regularity of magnetic induction with no defect specimen and the distribution regularity of 3D leakage magnetic field with defective specimens are obtained based on the ANSYS solutions.Meanwhile,the influences of defect geometric parameters both on the total magnetic induction intensity and on the axial component are studied.And the influence of current intensity on the total magnetic induction intensity is also obtained.According to the results of ANSYS analysis,it is easy to find that there exists a non-detection zone by magnetic flux leakage detection.Finally,by adding a guide specimen to the original specimen,the problem of the non-detection zone in the end of specimen is solved and the feasibility of the total testing is verified by simulation.
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