基于脉冲涡流磁场梯度检测的多层金属结构层间腐蚀缺陷成像  

Defect imaging technique for interlayer corrosion in stratified conductors based on gradient-magnetic-field-measurement-based PECT

作　　者：刘相彪[1] 李勇[1] 闫贝[1] 陈振茂[1] 齐勇[1] 

机构地区：[1]西安交通大学航天航空学院、机械结构强度与振动国家重点实验室、核能结构安全检测与完整性评价研究中心,陕西西安710049

出　　处：《西安理工大学学报》2014年第4期460-464,共5页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51007069/E070104);中央高校基本科研业务费专项资金资助项目(2011JDHZ20)

摘　　要：多层金属结构常见于大型、复杂装备中,由于其恶劣的服役环境结构层间易出现腐蚀缺陷,严重影响在役装备结构的质量与安全。本研究通过仿真和试验研究,探究了脉冲涡流磁场梯度检测方法在多层金属结构层间腐蚀缺陷成像中的实现手段及优势性。建立了脉冲涡流磁场梯度检测的三维有限元模型,仿真分析了脉冲涡流磁场梯度检测方法在多层金属结构层间腐蚀缺陷成像中的有效性和优势性。搭建了脉冲涡流磁场梯度检测试验系统,对仿真结果进行了验证。研究结果表明脉冲涡流磁场梯度检测方法可对多层金属结构层间腐蚀缺陷进行高精度成像。Stratified conductive structures （SCS） are widely used in large and complex apparatus, which are subject to the interlayer corrosion due to rigorous environment. This paper intensively investigates the implementation and advantages of the proposed defect whereby seriously affecting quality and safety of using equipment structure, imaging technique for interlayer corrosion in SCS based on gradient-magnetic-field-measurement-based pulsed eddy current testing （GPECT） via simulations and experiments. A 3D Finite Element Model （FEM） of GPECT has been built, and the effectiveness and advantages of GPECT for defect imaging of interlayer corrosion are investi- gated through simulations. In parallel, an experimental system of GPECT has been set up, and a series of experiments have been conducted. The simulation results are tested. The research results indicate that the pulsed eddy gradient magnetic detecting method can carry out the imaging with high accuracy for the stratified conductive structure interlayer corrosion defect.

关 键 词：无损检测 脉冲涡流检测 磁场梯度测量 缺陷成像 层间腐蚀缺陷 

分 类 号：TG115.28[金属学及工艺—物理冶金]