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Ultrasensitive embedded sensor for composite joints based on a highly aligned carbon nanotube web
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Kumar, Sandeep, Falzon, Brian G. and Hawkins, Stephen C. (2019) Ultrasensitive embedded sensor for composite joints based on a highly aligned carbon nanotube web. Carbon, 149 . pp. 380-389. doi:10.1016/j.carbon.2019.04.044 ISSN 0008-6223.
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Official URL: http://dx.doi.org/10.1016/j.carbon.2019.04.044
Abstract
Herein, we present a novel approach for damage sensing in adhesively bonded joints using a carbon nanotube single layer web (CNT-SLW) which marks a significant departure from the approach of dispersing CNTs within epoxy resins. In this work, a very thin, highly aligned CNT-SLW (densified thickness ∼ 50 nm) with aerial density of 2.0 μg/cm2 was horizontally drawn from a vertically aligned CNT forest, positioned over an adhesive film, which was, in turn, placed between two non-conductive composite adherents. This was followed by the application of heat and pressure to cure the adhesive. These joints were subjected to quasi-static and cyclic loading to investigate the damage sensing performance of a CNT-SLW. The CNT-SLW sensor, placed parallel to the load direction, exhibits remarkably high cyclic stability as well as exceptionally high sensitivity to damage initiation and accumulation. The resistance increase (ΔR/Ro% ∼1633%) is significantly higher than that of adhesive sensors with dispersed CNTs/graphene reported in the literature. Morphological studies help to explain the sensing mechanism through interactions of the CNT-SLW with the evolution of micro-cracks. These results demonstrate the potential of macroscopic architectures of CNTs, with controlled orientation, for the development of high performance structural health monitoring (SHM) systems for damage detection.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Journal or Publication Title: | Carbon | ||||||||
Publisher: | Elsevier | ||||||||
ISSN: | 0008-6223 | ||||||||
Official Date: | August 2019 | ||||||||
Dates: |
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Volume: | 149 | ||||||||
Page Range: | pp. 380-389 | ||||||||
DOI: | 10.1016/j.carbon.2019.04.044 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
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