研究多层导电结构材料腐蚀检测优化问题,多层结构存在隐蔽性易漏检的难点.针对内部腐蚀缺陷难以有效检测问题,提出利用含隐藏腐蚀缺陷的多层导电结构线圈阻抗变化级数模型求解,获得影响线圈阻抗变化的相关参数.在有限元软件上,对含腐蚀多层导电结构上方线圈的阻抗变化,与一种Maxwell方程组、矢量磁位和空间解域截取的级数展开快速解析方法,进行了仿真计算,并分别对探头线圈激励频率、探头提离高度、多层导电结构表层厚度、探头尺寸等因素进行对比,所得结果吻合,并验证了结果的正确性和有效性,提高检测多层导电结构隐藏腐蚀缺陷的灵敏度,可为多层导电结构复杂缺陷的检测提供理论指导.%This paper presented a method to improve the ability of corrosion inspection in multilayer conductive material. The hidden corrosion in multilayer conductive plates is difficult to examine, based on the series expression of the coil impedance changes of the multilayer conductive plates with hidden corrosion, the relation among the pa-rameters affecting the coil impedance change was obtained. Using finite element method, the coil impedance changes were calculated and compared with an analytical calculation method based on the system of Maxwell equations, the magnetic vector potential and truncated region eigenfunction expansion method. The relations between the impedance change of the coil and the excitation frequency of coil, the lift-off of probe, the thickness of surface conductive layer, the dimension 6f probe were investigated respectively. The simulated results agree very well with the analytical results and confirms the correctness of the method, and the method can improve the sensitivity of hidden defect inspection, and provide guidance for nondestructive testing of multilayer conductive plates with complex defects.
展开▼
