矢量渐近边界条件在涡流检测微扰模型中的应用  

APPLICATION OF VECTOR ASYMPTOTIC BOUNDARY CONDITIONS TO THE DISTURBANCE MODEL OF EDDY CURRENT TESTING

作　　者：段耀勇[1] 盛剑霓[1] 陈荣华[1] 陈雨生[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《无损检测》1999年第5期193-195,202,共4页Nondestructive Testing

基　　金：中日无损评估中心资助项目

摘　　要：根据低频电磁场在导体中的集肤效应及基准模型中激励线圈相对较小的特点,将轴对称场与三维场相结合,建立了以裂纹形成的微扰场作为求解对象的微扰模型.为了进一步将微扰模型的有限元离散区域缩小,将矢量渐近边界条件引入到微扰模型中,且计算结果与实验结果符合得很好.According to the conductor skin effect in low-frequency electromagnetic field and the characteristic of comparatively small excitement coil in the benchmark model for eddy current testing, a disturbance model was set up by combining the axisymmetric field and 3-dimensional field, in which disturbed field due to the crack in a conductor is solved. In order to reduce the discrete region in finite element, a vector asymptotic boundary condition was introduced into the disturbance model. Computational results were consistent with experimental ones.

关 键 词：有限元 微扰模型 涡流检测 边界条件 

分 类 号：TG115.28[金属学及工艺—物理冶金]