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Electronics 2018, 7(8), 143; https://doi.org/10.3390/electronics7080143

MWCNT–Epoxy Nanocomposite Sensors for Structural Health Monitoring

1
School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 1417466191, Iran
2
Institute of Smart Systems Technologies, Alpen-Adria-Universität Klagenfurt, 9020 Klagenfurt, Austria
3
CTR Carinthian Tech Research AG, 9524 Villach, Austria
4
Mechanical Engineering Department, Carinthian University of Applied Sciences, 9524 Villach, Austria
*
Author to whom correspondence should be addressed.
Received: 22 July 2018 / Revised: 5 August 2018 / Accepted: 7 August 2018 / Published: 9 August 2018
(This article belongs to the Special Issue Innovative Technologies and Services for Smart Cities)
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Abstract

We address multi-walled carbon nanotubes (MWCNTs) for structural health monitoring in adhesive bonds, such as in building structures. MWCNT-loaded composites are employed to sense strain changes under tension load using an AC impedance measurement setup. Different weight percentages of 1, 1.5, 2 and 3 wt % MWCNTs are added to the base epoxy resin using different dispersion times, i.e., 5, 10, and 15 min. The equivalent parallel resistance of the specimens is first measured by applying an alternating voltage at different frequencies. To determine the mechanical as well as sensory properties, the specimens are then subjected to a tensile test with concurrent impedance measurement at a fixed pre-chosen frequency. Using alternating voltage, a higher sensitivity of the impedance reading can be achieved. Employing these sensors in buildings and combining the readings of a network of such devices can significantly improve the buildings’ safety. Additionally, networks of such sensors can be used to identify necessary maintenance actions and locations. View Full-Text
Keywords: carbon nanotubes; nanocomposite sensor; tensile testing; impedance measurement carbon nanotubes; nanocomposite sensor; tensile testing; impedance measurement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sam-Daliri, O.; Faller, L.-M.; Farahani, M.; Roshanghias, A.; Oberlercher, H.; Mitterer, T.; Araee, A.; Zangl, H. MWCNT–Epoxy Nanocomposite Sensors for Structural Health Monitoring. Electronics 2018, 7, 143.

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