涡流检测焊缝裂纹缺陷的有限元仿真

Finite Element Simulation of Welding Crack Defect Based on Eddy Current Testing

缺陷的定性/定量分析一直是涡流检测中的难点问题。为了研究裂纹缺陷的尺寸、埋深深度和截面形状对检测结果的影响,基于Maxwell 3D涡流场分析的方法,建立了双线圈传感器的涡流检测模型,重点对工件周围受缺陷扰动的感应磁场分布变化进行了有限元仿真研究。结果表明:通过分析感应磁场分量的变化可以实现裂纹缺陷定性/定量评估,为下一步船舶焊缝裂纹缺陷的在线检测提供了有价值的参考。

Qualitative/quantitative analysis of defect was a difficult point in eddy current testing.In order to analyze influences of the crack defect＇s dimension,buried depth and cross-section shape on the testing result,the eddy current testing model of double-coil sensor was established based on Maxwell 3D eddy current field analysis method,and the distributing variation of induction magnetic field around workpiece disturbed by defect was simulated by finite element method.The results show that it can realize the qualitative/quantitative evaluation of defect by analyzing the variation of induction magnetic field density in y-and z-axes,which provides valuable reference for further on-line detection to welding crack defect in shipping industry.