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Hierarchical Mode I AND Mode II Interlaminar Toughening OF Z-Pinned Composites Using 1D AND 2D Carbon Nanofillers
- Ravindran, Anil R., Ladani, Raj B., Wang, Chun H., Mouritz, Adrian P.
- Composites 2019
- carbon, carbon nanofibers, carbon nanotubes, delamination, nanocomposites, synergism
- Through-thickness reinforcements using z-pins is a highly effective method for increasing the delamination resistance of fibre-polymer laminates. Here we report a hierachical approach of incoporating carbon nanofillers and z-pins to further improve delamination toughness. The nanofillers include one-dimensional (1D) carbon nanofillers (e.g. carbon nanotubes, carbon nanofibres) or two-dimensional (2D) nanofillers (i.e. graphene nanoplatelets). Results of the interlaminar fracture toughness reveal that 1D nanofillers induce synergistic (greater-than-additive) improvements to both modes I and II delamination resistance of z-pinned laminates, whereas the 2D nanofiller show virtually no effect. Observations of the z-pin pull-out surfaces and the fracture surfaces reveal the main mechanisms why 1D nanofillers create a synergistic effect, but not the 2D nanofillers.