The Magnetic Flux Leakage Analysis of Cracks Based on the 3D Finite Element Method
Because the crack on pipelines are tight, irregular and can have branching with iron oxides between the fracture surfaces, flux leakage from cracks is small and it is currently difficult to characterize the crack quantitatively from the measured MFL data. Using the finite element method, the effects of crack sizes on the MFL density were analyzed respectively, and the influence of the crack-to-crack spacing on the MFL density was also discussed. The simulation results indicate that the MFL density would increase with the increasing of the depth while the depth is over 1mm; the MFL density increases with the crack width increasing firstly and then reduces with the increase of the width when the width reaches to 4mm; the MFL density would reduce with the crack length increasing when the length reaches to 20mm; the MFL reduces gradually with the distance increasing when the distance between two parallel cracks is less than 5mm.
magnetic flux leakage (MFL) crack finite element model (FEM) nondestructive testing
SONG Xiaochun XUE Li HUANG Songling ZHAO Wei
School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China;State Key Lab School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China State Key Lab of Power Systems, Dept. of Electrical Engineering, Tsinghua University, Beijing 100084
国际会议
北京
英文
2007-08-05（万方平台首次上网日期，不代表论文的发表时间）