Impact Properties of Multi-Wall Carbon Nanotubes Modified Composites

Multi-wall carbon nanotubes (MWCNTs) modifications are introduced on the surface of prepreg to enhance the impact properties of epoxy/Kevlar fiber composites. First, six kinds of Kevlar fiber reinforced composite modified by different weight fractions of MWCNTs were prepared using the combination of spray and brush methods. Second, low-velocity impact experiments were carried out to study the dynamic behavior of neat and modified laminates in terms of the impact force, damage morphology, strain evolution, and impact energy. Finally, the results indicated that the MWCNTs modified laminates with weight fraction 1.67, 3.33 wt. % had superior dynamic responses than neat laminate, but much more MWCNTs content will decrease the impact properties of composite materials obviously. This work provided an important basis for designing and evaluating the nanometer modified laminates.

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