Axial reinforcement of unidirectional composites by self-aligned graphene

Chu, J., Young, R. J., Slater, T. J. A. ORCID: https://orcid.org/0000-0003-0372-1551, Burnett, T. L., Coburn, B. and Li, Z. 2018. Axial reinforcement of unidirectional composites by self-aligned graphene. Presented at: 18th European Conference on Composite Materials (ECCM 2018), Athens, Greece, 24-28 June 2018. Proceedings of 18th European Conference on Composite Materials. Applied Mechanics Laboratory,

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Abstract

It is shown that the addition of approximately 2% by weight of graphene to the matrix of a unidirectionally-reinforced carbon fiber epoxy composite can lead to a significant enhancement in mechanical properties. In particular, it is found that the axial stiffness of the composites can be increased by the order of 10 GPa accompanied by an increase in axial strength of 200 MPa. X-ray computed tomographic imaging and polarized Raman spectroscopy have demonstrated that the graphene is predominately aligned parallel to the axes of the carbon fibers. Moreover stress-induced Raman band shifts showed that the self-aligned graphene is subjected to high levels of stress during axial deformation of the composite. The graphene is found to have an effective Young’s modulus in the composite of around 825 GPa, approaching its theoretical value of 1050 GPa. This behavior has been modelled using the rule of mixtures and shear-lag analysis and it is demonstrated that highlyaligned graphene in a constrained environment between high-modulus fibers can give significantly better mechanical reinforcement than graphene in conventional polymer-based nanocomposites.

Item Type:	Conference or Workshop Item (Paper)
Status:	Published
Schools:	Chemistry
Publisher:	Applied Mechanics Laboratory
ISBN:	9781510896932
Last Modified:	10 Nov 2022 10:32
URI:	https://orca.cardiff.ac.uk/id/eprint/147167

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