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15 November 2011The simulation and experimental analysis of the MFL for cracks inspection in pipelines under mechanics-magnetic coupling
Since the magnetic flux leakage (MFL) for cracks inspection in pipelines can be influenced by stress concentration, it is
very difficult to characterize and size the crack or crack-like defects. Thus, the theory model of magnetization and
permeability under mechanics-magnetic coupling was derived by thermodynamic equation firstly, and the effects of the
applied stress on magnetization and permeability were analyzed theoretically. The finite element method (FEM) under
mechanics-magnetic coupling was studied, and the relationship of the crack’s MFL and loaded stresses were simulated
and studied using the 3D FEM. And the simulation results were verified by experiments with the help of material testing
system (MTS). The simulation and experimental results demonstrate that the experimental results are basically consistent
with simulation results, and the MFL density caused by cracks decreases with the applied stress increasing gradually.
Therefore, the higher sensitivity sensors should be employed in the MFL measurement for pipeline cracks and the testing
data should be compensated while quantitative interpretation.
Xiaochun Song,Li Xue, andZhengwang Xu
"The simulation and experimental analysis of the MFL for cracks inspection in pipelines under mechanics-magnetic coupling", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83211R (15 November 2011); https://doi.org/10.1117/12.904784
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Xiaochun Song, Li Xue, Zhengwang Xu, "The simulation and experimental analysis of the MFL for cracks inspection in pipelines under mechanics-magnetic coupling," Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83211R (15 November 2011); https://doi.org/10.1117/12.904784