30 March 2009 Nano-enhanced aerospace composites for increased damage tolerance and service life damage monitoring
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Abstract
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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A. Paipetis, A. Paipetis, T. E. Matikas, T. E. Matikas, N. M. Barkoula, N. M. Barkoula, P. Karapappas, P. Karapappas, A. Vavouliotis, A. Vavouliotis, V. Kostopoulos, V. Kostopoulos, } "Nano-enhanced aerospace composites for increased damage tolerance and service life damage monitoring", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72921O (30 March 2009); doi: 10.1117/12.815210; https://doi.org/10.1117/12.815210
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