Proceedings of the 9th World Conference in 3D Fabrics and Their Applications, Zhengzhou, China, 8 - 09 April 2021, pp.1-12
Mechanical properties such as tensile, shear and interlaminar shear of multi-nanostitched three
dimensional (3D) carbon/epoxy composites were studied. Introducing the polyacrylonitrile (PAN)
nanostitched yarn into carbon preform composite marginally decreased the tensile properties, whereas
it improved the shear and interlaminar shear properties. Multi-nanostitched 3D carbon/epoxy
composite under the tensile loading suppressed the layer to layer opening and failure mode included
multiple brittle fiber and matrix tensile breakages at local region. On the other hand, delamination
propagation under shear loading was inhibited via angular deformation of the multi-nanostitching
fibers. Additionally, all of the structures under the short beam loading experienced angularly sheared
fatal layer breakage in the z-direction and interlaminar delamination was arrested in the
multi-nanostitched composite due to the nanostitching insertion in the composite during preform
formation.