▎ 摘　　要

This research paper explores and highlights the effect of aspect ratio (AR) and specific surface area (SSA) of Graphene Nano-Platelets (GNPs) on the interlaminar fracture behavior of carbon fiber-reinforced polymer (CFRP) composites. Various types of GNPs having different aspect ratios were dispersed in an epoxy system by using the three roll milling technique at a fixed content of 0.5 wt.%. The blends resulting from this procedure were used for the impregnation of carbon fabrics aiming in obtaining nano-modified epoxy pre-impregnated fabrics (Prepregs). The prepreg material was used for the fabrication of CFRPs by using the autoclave technique. The resistance of composites to interlaminar crack propagation was measured by performing Mode I and II fracture tests utilizing the DCB and ENF configurations. The fracture surfaces of the tested samples were investigated post-mortem using Scanning Electron Microscopy (SEM). We show that the graphene Nano-Platelets with higher AR and SSA combined lead to enhanced interlaminar fracture toughness under mode I and mode II loading as compared to the unmodified composite system.