The crack starts to propagate at the matrix along the fibre axis, and delamination occurs between different fibre layers (Fig. ii-iii). However, in GNP-coated glass-carbon/epoxy hybrid composites, the GNP on the fabric surface acts as a bridge, increasing the mechanical interaction between fibres and matrix. This formed a stronger graphene-epoxy matrix interface. Due to this strong interface among the GNP-fibre and epoxy chain, the tensile strength of the GNP-coated glass-carbon/epoxy hybrid composite was enhanced. The strong interface of the graphene nanoplatelets can act as a bridging element that reduces stress concentration and delays crack propagation in the interface region, promoting a smooth transfer of load from the carbon to the glass fibres after initial failure. . The fracture surface morphology of the composites was analysed after the tensile test using SEM. Fig. shows the fracture surface image of the glass-carbon/epoxy hybrid composite without coating, while Fig. shows the GNP-coated glass-carbon/epoxy hybrid composites of 1 wt.% and 5 wt.% GNP, respectively. The without-coating glass-carbon/epoxy shows a smooth fracture surface, indicating relatively brittle failure. However, the GNP-coated glass-carbon/epoxy composite shows a relatively rougher surface compared to the uncoated composite. These results indicate that the GNP is mechanically interlocking with the fibre, which suppresses the crack propagation after the initial failure of the carbon fibre and transfers the load to the glass fibre.