Journal of Mechanical Science and Technology

, Volume 32, Issue 2, pp 623–630 | Cite as

Measurement of residual stress using linearly integrated GMR sensor arrays

  • Jungmin Kim
  • Minhhuy Le
  • Juhyeon Park
  • Heejoon Seo
  • Gyejo Jung
  • Jinyi LeeEmail author


Tubular-type transmission towers have several advantages, but could be compromised if welding defects from the construction process are not found during deployment. This research derived an equation that illustrates how a change in stress accompanied with mechanical deformation triggered a change in distribution of magnetic flux density. Furthermore, it verified experimentally that a change in distribution of magnetic flux density occurred due to a change in stress at the welding zone. Using this principle, this research proposes a system to measure residual stress occurred in the welding zone of tubular-type transmission tower. The ultrasound examination results were compared and the result showed that ultrasound signals revealed defects in a place where sudden distribution of magnetic flux density was presented. However, when a number of welding defects occurred across the large area, the distribution of magnetic flux density may not change due to the alleviating effect of the stress concentration.


Residual stress Tubular-type transmission tower Stress concentration Weld zone GMR Sensor array Non-destructive testing 


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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Jungmin Kim
    • 1
  • Minhhuy Le
    • 1
  • Juhyeon Park
    • 1
  • Heejoon Seo
    • 1
  • Gyejo Jung
    • 2
  • Jinyi Lee
    • 1
    Email author
  1. 1.Research Center for IT-based Real Time NDTChosun UniversityPyongyangKorea
  2. 2.Korea Electric Power Research InstituteDaejeonKorea

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