基于脉冲涡流的多层金属铆接结构孔周裂纹缺陷检测仿真

Simulation of Crack Defects Testing Around Holes in Multi-layer Metal Riveting Structures Based on Pulsed Eddy Current

脉冲涡流(PEC)检测技术由于其深层缺陷检测能力和高灵敏度等优点,被应用于多层铆接结构内部缺陷的检测中。为了研究PEC矩形传感器的尺寸参数对多层铆接结构孔周裂纹缺陷检测性能的影响,采用有限元仿真软件COMSOL构建PEC矩形传感器的三维仿真模型,根据PEC在多层铆接结构中的分布规律,通过数值仿真研究探头结构参数以及中心轴偏移量对检测效果的影响。仿真测试结果表明:矩形探头长宽高尺寸比例在1:1.25:1.25时检测灵敏度最高,适宜多层铆接结构的孔周裂纹检测。同时发现,为了保证足够的检测灵敏度,在垂直裂纹缺陷的方向上,偏移量应小于1 mm,在与缺陷平行且重合的方向上,偏移量应小于0.2 mm。该研究结果为多层金属铆接结构孔周裂纹检测传感器尺寸参数设计提供依据。

Pulsed eddy current(PEC)testing technology,renowned for its deep defect detection capability and high sensitivity,has been applied in the detection of internal defects in multi-layer riveted structures.To reveal the influence of the size parameters of PEC rectangular sensors on the detection performance of crack defects around holes in these structures,a three-dimensional simulation model of PEC rectangular sensor was constructed using the finite element simulation software COMSOL.Based on the distribution law of PEC in multi-layer riveted structures,the impact of probe structure parameters and central axis offset on the detection effect was studied through numerical simulation.The simulation test results show that the detection sensitivity of the rectangular probe peaks when the ratio of length to width to height is 1:1.25:1.25,which is suitable for detecting cracks around holes in multi-layer riveting structures.Furthermore,it was found that to ensure adequate detection sensitivity,the offset should lower than 1 mm in the direction perpendicular to the crack defect,and less than 0.2 mm in the direction parallel and overlapping with the defect.The findings provide a foundational basis for the design of sensor size parameter aimed at detecting cracks around holes in multi-layer metal riveting structures.