This study deals with new generation composite systems which apart from the primary reinforcement at the typical fiber
scale (~10 μm) are also reinforced at the nanoscale. This is performed via incorporation of nano-scale additives in typical
aerospace matrix systems, such as epoxies. Carbon Nanotubes (CNTs) are ideal candidates as their extremely high aspect
ratio and mechanical properties render them advantageous to other nanoscale materials. The result is the significant
increase in the damage tolerance of the novel composite systems even at very low CNT loadings. By monitoring the
resistance change of the CNT network, information both on the real time deformation state of the composite is obtained
as a reversible change in the bulk resistance of the material, and the damage state of the material as an irreversible
change in the bulk resistance of the material. The irreversible monotonic increase of the electrical resistance can be
related to internal damage in the hybrid composite system and may be used as an index of the remaining lifetime of a
structural component.
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