Figure 3. Mechanical properties of fibres.

(a) Typical stress-strain curves for neat GGO (1), GGO-HPG (2), and GGO-HPG-GA (3) fibres. The strain rate is 10% per minute. (b) Comparison of our bio-mimetic composites with nacre, bone, and reported layer-structured nanocomposites in terms of σ and volumetric toughness. (c) Comparison of our bio-mimetic composites with typical metallic alloys and engineering plastics in terms of specific strength. (d) Schematic illustration of the adaptive hydrogen bonding networks in GGO-HPG composites. The hydrogen bondings (marked in green) are destructed under tension and reformed subsequently as graphene sheets slip (shown in the below scheme).