Characterization of moisture absorption and flexural performance of functionalized graphene modified carbon fiber composites under low energy impact

Composite failure due to in-service low energy impact damage and moisture absorption is a major risk for these materials within aerospace, automotive other engineering sectors. Deterioration in post-impact flexural properties, the tendency of thermosets absorb are some few drawbacks carbon fiber reinforced polymers (CFRPs). Adding graphene into matrix theorized improve mechanical properties reduce uptake. This study evaluates diffusion characteristics fiber/epoxy composites modified with NH2 functionalized (CFRP/graphene nanoparticle [GNPs]) before after under various environmental conditions. GNPs CFRP decreased strength modulus by 24% 25% respectively impact. After impact, 7.4%–23.6% 37%–67%, respectively. For both undergoing residual stiffness were considerably reduced delamination transverse cracking. Samples inclusion experienced slower rate ethanol water diffusion, unimpacted impacted samples, 46.4% 44.8%, Moisture uptake also composites. Scanning electron microscopy revealed good dispersion but poor bonding matrix, which believed be reason property reduction.