MWNT-Doped Epoxy Matrix for Detecting Impact Damages in Fiber Reinforced Composites by Electrical Resistance Measurements

摘要

In this paper, we report the development of a glass fiber reinforced composite based on a MWNT-doped epoxy matrix. The intrinsic electrical conductivity of carbon nanotubes has allowed the production of a nanocomposite with enhanced electrical properties, respect the neat matrix. Due to the high aspect ratio of carbon nanotubes, very small amounts of these particles were enough for modifying the electrical properties of the obtained glass fiber composites. A low-velocity impact was created on the surface of the laminate, in order to produce a damage, which not involved the catastrophic failure of the sample. In order to evaluate the damage level, a mechanical characterization was performed on pristine samples, on one hand, and impacted The measurement of the electrical resistance, before and after the impact, was exploited as a way for detecting the presence of the damage produced. The results have shown that it is possible to associate the increase in electrical resistance of the composite with the formation of a damage due to an impact.