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Smart Structures and Systems
  Volume 28, Number 6, December 2021 , pages 737-744
DOI: https://doi.org/10.12989/sss.2021.28.6.737
 


Structural health monitoring of CFRPs using electrical resistance by reduced peripheral electrodes
Young-Bin Park, Hyung Doh Roh and In Yong Lee

 
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.
 
Key Words
    carbon fiber reinforced polymer; composites; nondestructive evaluation; smart materials; structural health monitoring (SHM)
 
Address
(1) Hyung Doh Roh:
Composites Research Division, Korea Institute of Materials Science, Changwon-daero 797, Changwon, Gyeongnam 51508, Republic of Korea;
(2) Young-Bin Park, In Yong Lee:
Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, UNIST-gil 50, Ulju-gun, Ulsan 44919, Republic of Korea.
 

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