涡流检测中平板导体的理想裂缝模型  

THE IDEAL CRACK MODEL IN EDDY CURRENT NONDESTRUCTIVE TESTING

作　　者：幸玲玲[1] 盛剑霓[2] 

机构地区：[1]南京师范大学,江苏南京210042 [2]西安交通大学,陕西西安710049

出　　处：《中国电机工程学报》2002年第2期41-46,共6页Proceedings of the CSEE

基　　金：国家教委博士点基金 ( 980 6 982 1);中日无损评估中心资助项目

摘　　要：将理想裂缝模型从半无限大导体推广到有限厚平板导体情况 ,使体积积分方程法推进至实用化阶段。将传统的阻抗分析法改进为场量分析法 ,推导出了场点和源点位于同一区域和位于不同区域时的并矢格林函数 ,解决了求解等效电流偶极子分布时的积分奇点问题 ,并且将积分方程法的计算结果与FEM BEM组合法的计算结果进行了对比 ,表明有限厚平板导体中理想裂缝模型的准确性和高效性 。The ideal crack model of fatigue cracks is extended from a homogeneous half space conductor to a limited thickness conducting plate,and the traditional analysis method based on the probe's impedance change are transformed to field analysis based on the perturbed magnetic field due to the crack.The dyadic Green's functions are derived,in which source points and field points are located in the same region as well as in different regions.The singularity of the Green's function is evaluated by numerical method.Using a moment method scheme,numerical predictions have been made for the ideal crack model.These predictions have been compared with the results computed by FEM BEM.Good agreement has been found between both solutions.It is shown that the ideal crack model of a limited thickness conducting plate is correct and efficient,and computation is rapid.

关 键 词：涡流检测 平板导体 理想裂缝模型 电力强度 磁场强度 

分 类 号：TM154[电气工程—电工理论与新技术]