How can hierarchical composites with carbon nanotube-grafted carbon fibres enhance compression performance?
File(s)
Published version
Author(s)
Type
Conference Paper
Abstract
Compressive strength of carbon fibre reinforced polymer (CFRP) composites underperforms relative to tensile strength by up to 50%. This research explores the effects of grafting carbon nanotubes (CNTs) uniformly onto carbon fibres (CF), which increases the apparent interphase volume and interfacial shear strength. CNT-grafted-CF were synthesised via a continuous chemical vapour deposition process, achieving uniform CNT coverage with controlled CNT network corona lengths ranging between 363 to
831 nm. This process increased the specific surface area by more than an order of magnitude to 5.35 m 2.g-1 with CNT loadings up to 2.9 wt.% (relative to the CF). Semi-empirical calculations indicated potential improvements with CNT-grafted-CF compared to unsized CF in composite longitudinal stiffness and tensile strength, primarily due to a projected 10% increase in effective fibre volume fraction at a primary fibre content of 0.4 Vf. Compression strength of CFRP could be even greater, with an estimated 27% increase in interphase shear modulus, as predicted by the modified Halpin-Tsai equation.
831 nm. This process increased the specific surface area by more than an order of magnitude to 5.35 m 2.g-1 with CNT loadings up to 2.9 wt.% (relative to the CF). Semi-empirical calculations indicated potential improvements with CNT-grafted-CF compared to unsized CF in composite longitudinal stiffness and tensile strength, primarily due to a projected 10% increase in effective fibre volume fraction at a primary fibre content of 0.4 Vf. Compression strength of CFRP could be even greater, with an estimated 27% increase in interphase shear modulus, as predicted by the modified Halpin-Tsai equation.
Date Issued
2024-07-02
Date Acceptance
2024-05-01
Citation
Proceedings of the 21st European Conference on Composite Materials, 2024, 8, pp.734-740
ISBN
978-2-912985-01-9
Publisher
The European Society for Composite Materials (ESCM) and the Ecole Centrale de Nantes
Start Page
734
End Page
740
Journal / Book Title
Proceedings of the 21st European Conference on Composite Materials
Volume
8
Copyright Statement
©2024 ECCM21/The publishers The Proceedings are published under the CC BY-NC 4.0 license in electronic format only, by the Publisher. The CC BY-NC 4.0 license permits non-commercial reuse, transformation, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial reuse, please contact the authors. For further details please read the full legal code at: https://creativecommons.org/licenses/by-nc/4.0/legalcode
License URL
Source
European Conference on Composite Materials
Publication Status
Published
Start Date
2024-07-02
Finish Date
2024-07-05
Coverage Spatial
Nantes, France