Improvement of mechanical performance via interfacial strengthening of carbon fiber?epoxy reinforced hybrid laminate by incorporation of functionalized graphene nanoplatelet interphase

Increasing the mechanical performance of hybrid laminated composites by strengthening interface.This study is an attempt to develop high?quality hybrid composites via functionalization (for homogeneous distribution) of the graphene nanoplatelets (FGNP) and then doping to carbon fiber reinforced especial aviation epoxy matrix (Araldite LY5052) via vacuum bagging molding (VBM). The utilized materials were characterized by UV–Vis spectroscopy, tensile, impact, hardness tests, and fracture mode analysis using a scanning electron microscope (SEM). The results revealed a 92% (502.5?MPa) and 85% (490?MPa) improvement in tensile strength values by doping the 1 and 1.5?wt% FGNPs, respectively. There was an improvement in impact strength with the addition of FGNP; a 28% (3.23?J/mm2) increase was achieved in the nanocomposite with 1?wt% FGNP added, and there was a decrease again in the nanocomposite with 1.5?wt% FGNP added. However, it was still 12% (2.83?J/mm2) better than the neat composite. In addition, the results of examining the fractured surface structures of the impact and tensile test specimens were compatible with these results. It reveals a significant separation of fiber?matrix bonds with 1.5?wt% FGNP contribution. While tensile and impact strengths peak at 1?wt% FGNP value and decrease afterward, hardness values increase in parallel with the increase in FGNPs.HighlightsComposites were developed by functionalized graphene nanoplatelets (FGNP).The fiber?matrix interface was strengthened with FGNP interphase.A 92% tensile strength increase was achieved with 1?wt% FGNP additives.28% in impact strength and 55% in hardness increase by 1?wt% FGNP.The morphology confirmed that the FGNP interphase filled the interface.

» Publication Date: 12/11/2024

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