摘要
应用脉冲涡流对裂纹缺陷进行定量检测是无损检测领域的研究热点。为进一步优化脉冲涡流无损检测技术的设计,深入理解其原理和找出其对裂缝缺陷检测的特点就变得尤为重要。在此采用脉冲涡流技术对金属平板中的裂纹缺陷进行检测,在分析脉冲涡流工作原理的基础上,应用ANSYS仿真软件建立检测线圈放置方向不同的三组仿真模型,分别研究裂纹缺陷对脉冲涡流空间三维磁场分布的影响规律,提出对裂纹缺陷长度和深度进行定量的新特征量,得出用垂直于平板表面方向磁场分量定深和用沿缺陷方向磁场分量定长的结论。采用试验的方法对仿真结果进行验证,试验结果与仿真结论相一致,证明所提取出的缺陷定量特征量的正确性。
To get the information on cracks in metallic components by method of pulsed eddy current （PEC） is a hotspot in the electromagnetic nondestructive testing （NDT） field.In order to optimize the design of PEC,deeply understanding the principle of PEC and finding out its characteristics of crack testing are especially important.PEC is used to detect the cracks in metallic components.On the basis of analysis of the working principle of PEC,ANSYS simulation software is adopted to build three sets of simulation models with their pick-up coils in different placement directions,so as to find the rules that reflect the distribution of three-dimensional magnetic field,which contain information on cracks.Then the new eigenvalues which reflect the information on defect depth and length are proposed,coming to a conclusion that the magnetic field whose direction is perpendicular to the metallic plane or in parallel with the longer border of the defect can be used to measure defect depth and length.At last,the simulation result is verified by the experiment method,the agreement between theory and experiment shows that the obtained eigenvalues of defect are correct.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第12期25-30,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(50807053)
关键词
脉冲涡流
裂纹缺陷
定量检测
仿真分析
试验研究
Pulsed eddy current Cracks Quantitative testing Simulation analysis Experimental research
