Comparative Study of Graphene and CNT Reinforcement on Composite Crack Resistance

Abstract

The integration of nanoscale reinforcements such as carbon nanotubes (CNTs) and graphene into polymer composites has revolutionized the field of high-performance materials. Both graphene and CNTs provide exceptional mechanical properties, including high tensile strength and modulus, but their influence on crack initiation, propagation, and overall fracture resistance differs due to distinct geometrical and interfacial characteristics. This study presents a comprehensive comparative investigation of CNT- and graphene-reinforced composites, focusing on their crack resistance under Mode I, Mode II, and mixed-mode loading conditions. Polymer matrices were reinforced with varying concentrations of CNTs and graphene nanoplatelets (GNPs), and specimens were fabricated using controlled casting and curing techniques to ensure uniform dispersion. Experimental methods included fracture toughness testing, interlaminar shear testing, and impact testing.