Smart Structures and Systems

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Structural health monitoring of CFRPs using electrical resistance by reduced peripheral electrodes

  • Park, Young-Bin (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) ;
  • Roh, Hyung Doh (Composites Research Division, Korea Institute of Materials Science) ;
  • Lee, In Yong (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2021.02.26
  • Accepted : 2021.08.06
  • Published : 2021.12.25
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Abstract

In this study, structural health monitoring (SHM) methods of carbon fiber reinforced plastics (CFRPs) were investigated using electrical resistance. The developed sensing technique monitored electrical resistance in accordance with the impact damage of a CFRP. The changes in electrical resistances with multiple electrode sets enabled SHM without extra sensors so that this technique can be called self-sensing. Moreover, this study proposed electrodes only at peripheral side of a structure to minimize the number of electrodes compared to those in an array which has square number of sensors as the sensing area increases. For the intensive investigation, electromechanical sensitivity in terms of electrode distance was analyzed and optimized under drop weight impact testing. Then, SHM methods with electrodes in an array and electrodes in peripheral edges were comparatively investigated. The developed methods successfully localized impact damages into 2D coordinates. Furthermore, damage severity can be shown with a damage map by calculating electrical resistance change ratio. Therefore, structural health self-sensing system using electrical resistance was successfully developed with the minimum number of electrodes.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT, Korea (NRF-2017R1A5A1015311).

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