Electric potential distributions in carbon fiber/epoxy plain-woven laminates with different current directions. (15th August 2021)

• Record Type: Journal Article
• Authors: Han, Chaofeng; Sun, Baozhong; Gu, Bohong
• Is Part Of: Composite structures. Volume 270(2021)
• Publication Date: 2021-08-15
• Subjects: Carbon fibers -- Plain-woven laminates -- Electric potential distribution -- Electric conductivity; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2021.114059
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: Revealing electric potential distributions in carbon fiber reinforced polymer composites (CFRPs) is important in structural health monitoring (SHM). Here we report effects of current injection modes, probing depth and preform structure on the electric potential distributions in carbon fiber/epoxy plain-woven (PW) laminates. We have conducted a series of electric distribution measurements and established a linear anisotropic conductivity model to show the electric potential distribution. It was found that fiber tow waviness and bridging region in the PW laminates lead to the decrease of electric conductivities along in-plane direction, and the increase along thickness direction. Two pairs of electrodes with vertical current flow paths lead to a positive superposition effect, while a negative superposition effect from opposite current flow paths. The electric current along thickness direction decreases because of high inter-laminar contact resistance.