中国铁道科学2017，Vol.38Issue(2)：28-33,6.DOI:10.3969/j.issn.1001-4632.2017.02.05
钢轨表面裂纹涡流检测定量评估方法
Quantitative Evaluation Method for Eddy Current Testing of Rail Surface Crack
摘要
Abstract
Based on ANSYS software,eddy current testing model was established for a steel plate with the cracks of 9.0 mm long,0.2 mm wide and 0.1,0.2,0.5,1.0,1.5,2.0,5.0 mm deep respectively.The fitting curve of approximate exponential relation between surface crack depth and magnetic induction intensity was obtained by simulation.The test specimens of crack on rail surface were made in laboratory.The crack depth of vertical crack test specimen on rail surface was 0.5,1.0,2.0 and 5.0 mm respectively.The equivalent vertical depth of inclined crack test specimen on rail surface was 1.0 and 2.0 mm respectively,and the inclination angle was 15 °,30 °,45 ° and 60 ° respectively.The relationship between the depth of crack surface and the voltage amplitude of the eddy current detection signal was fitted by exponential relationship,and the exponential function formula with high reliability was obtained.The eddy current testing of a section of rail with natural crack was carried through.The crack depth of rail surface was calculated by using the fitting exponential function formula,and the results were compared with actual measurement results.Results show that,when the crack on rail surface with a depth of about 2 mm is evaluated by the fitting exponential function formula,the calculation error the surface crack depth is no more than 10％.However,the error is getting bigger,so eddy current testing method can be used to effectively detect and quantitatively evaluate the rail surface crack within 2 mm in depth.关键词
钢轨探伤/表面裂纹/涡流检测/指数函数/非接触无损检测Key words
Rail flaw inspection/Surface crack/Eddy current testing/Exponential function/Non-contact nondestructive testing分类
交通工程引用本文复制引用
黄凤英..钢轨表面裂纹涡流检测定量评估方法[J].中国铁道科学,2017,38(2):28-33,6.基金项目
中国铁道科学研究院行业服务技术创新项目(2015YJ077) （2015YJ077）
