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Open AccessArticle

Online Structural-Health Monitoring of Glass Fiber-Reinforced Thermoplastics Using Different Carbon Allotropes in the Interphase

1
Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, D-01069 Dresden, Germany
2
Institute of Textile Machinery and High Performance Material Technology, Technische Universität Dresden, D-01062 Dresden, Germany
*
Author to whom correspondence should be addressed.
Materials 2018, 11(7), 1075; https://doi.org/10.3390/ma11071075
Received: 15 May 2018 / Revised: 4 June 2018 / Accepted: 15 June 2018 / Published: 25 June 2018
(This article belongs to the Special Issue Polymer Composites and Interfaces)
An electromechanical response behavior is realized by nanostructuring the glass fiber interphase with different highly electrically conductive carbon allotropes like carbon nanotubes (CNT), graphene nanoplatelets (GNP), or conductive carbon black (CB). The operational capability of these multifunctional glass fibers for an online structural-health monitoring is demonstrated in endless glass fiber-reinforced polypropylene. The electromechanical response behavior, during a static or dynamic three-point bending test of various carbon modifications, shows qualitative differences in the signal quality and sensitivity due to the different aspect ratios of the nanoparticles and the associated electrically conductive network densities in the interphase. Depending on the embedding position within the glass fiber-reinforced composite compression, shear and tension loadings of the fibers can be distinguished by different characteristics of the corresponding electrical signal. The occurrence of irreversible signal changes during the dynamic loading can be attributed to filler reorientation processes caused by polymer creeping or by destruction of electrically conductive paths by cracks in the glass fiber interphase. View Full-Text
Keywords: glass fiber; interphase; in-situ sensor; glass fiber-reinforced thermoplastics; carbon filler glass fiber; interphase; in-situ sensor; glass fiber-reinforced thermoplastics; carbon filler
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MDPI and ACS Style

Müller, M.T.; Pötzsch, H.F.; Gohs, U.; Heinrich, G. Online Structural-Health Monitoring of Glass Fiber-Reinforced Thermoplastics Using Different Carbon Allotropes in the Interphase. Materials 2018, 11, 1075.

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