Abstract
Fiber-reinforced composites are favored in aerospace and automotive applications due to their enhanced strength-to-weight and stiffness-to-weight ratios. However, impact-induced internal damage following low velocity impact is a major concern preventing the more aggressive use of fiberreinforced composites in high performance structural applications. Here we show that by infiltrating a multiwalled carbon nanotube network into the composite, it is possible to detect impact-induced internal damage by monitoring localized disruptions in the electrical conductivity of the nanotube network. Such a built-in array of non-intrusive nano-sensors could enable the early detection of impending failures in real time before they become catastrophic.
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