Article ID Journal Published Year Pages File Type
7215162 Composites Science and Technology 2016 23 Pages PDF
Abstract
A high-performance piezoresistive strain sensor can be used to monitor the deformation and damage in the structural composites. We developed the sensors with high sensitivity by structuring a 3D graphene network into an epoxy matrix. One-pot synthesis of amino-functionalized graphene nanoplates (f-GnP) was realized from graphite oxide and polyether amine, so that the dispersion of graphene in epoxy was well improved. The f-GnP/epoxy composite with lower percolation threshold, i.e. ∼1.31 vol%, exhibited relatively high gauge factor of ∼45 and Young's modulus of ∼2.2 GPa. Importantly, the studied sensor with f-GnP network structure could help to detect the initiation and accumulation of damage in the structure materials under tensile loading. The normalized electrical resistance change (ΔR/Ro) of the composite sensor initially almost increased linearly, then shown nonlinear drift and irregular ladder-shaped growth with the appearance of irreversible damage and deformation. These results suggest that the graphene/epoxy piezoresistive sensors show promising applications for the damage monitoring of structural materials in the field of aerospace.
Related Topics
Physical Sciences and Engineering Engineering Engineering (General)
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