Smart Structures and Systems

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Time dependent numerical simulation of MFL coil sensor for metal damage detection

  • Azad, Ali (Department of Civil and Environmental Engineering, Sejong University) ;
  • Lee, Jong-Jae (Department of Civil and Environmental Engineering, Sejong University) ;
  • Kim, Namgyu (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • Received : 2019.08.13
  • Accepted : 2021.09.24
  • Published : 2021.12.25
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Abstract

Recently, non-destructive health monitoring methods such as magnetic flux leakage (MFL) method, have become popular due to their advantages over destructive methods. Currently, numerical study on this field has been limited to simplified studies by only obtaining MFL instead of induced voltage inside coil sensor. In this study, it was proposed to perform a novel numerical simulation of MFL's coil sensor by considering vital parameters including specimen's motion with constant velocity and saturation status of specimen in time domain. A steel-rod specimen with two stepwise cross-sectional changes (i.e., 21% and 16%) was fabricated using low carbon steel. In order to evaluate the results of numerical simulation, an experimental test was also conducted using a magnetic probe, with same size specimen and test parameters, exclusively. According to comparative results of numerical simulation and experimental test, similar signal amplitude and signal pattern were observed. Thus, proposed numerical simulation method can be used as a reliable source to check efficiency of sensor probe when different size specimens with different defects should be inspected.

Keywords

Acknowledgement

This research was supported by a grant (19CTAP-C151927-01) from the Transportation Technology Promotion Research Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government.

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