Journal
APPLIED COMPOSITE MATERIALS
Volume 29, Issue 1, Pages 3-26Publisher
SPRINGER
DOI: 10.1007/s10443-021-09964-1
Keywords
Multiwall carbon nanotubes; Carbon fiber; Nanoprepreg; Nanostitching; In-plane tensile and shear; Interlaminar strength
Categories
Funding
- Roketsan Industries Incorporations [RS/ERCIYES DSM-76301-14-01 N/R]
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Introducing nanostitching technology into 3D carbon/epoxy composites can improve shear and interlaminar shear properties while potentially decreasing tensile properties. Under different loading conditions, multi-nanostitched structures have different effects on the failure modes and paths of the composites.
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.
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