▎ 摘　　要

Recently, there have been rapid advances in the use of Carbon fiber reinforced polymer (CFRP) composites in cryogenic applications. Graphene-based nanofillers are under the limelight as an ideal material for being used as nanofillers in multi-scale fiber reinforced composites because of their various exotic properties. Electrophoretic deposition (EPD) of graphene-based nanofillers on carbon fiber is an attractive technique to improve the quality of the interface of CFRP composites. In the present study, the effect of nano-filler concentration in the EPD bath on the mechanical behavior of Graphene carboxyl (G-COOH) grafted CFRP composites was evaluated both at room temperature and cryogenic temperature. Experimental results showed that out of three different concentrations (0.5 g/L, 1.0 g/L, 1.5 g/L) used, 1.5 g/L has shown the best mechanical behavior at both room temperature (RT) and cryogenic temperature (CT). At RT testing maximum improvement of 25.383% and 7.287% was observed in interlaminar shear strength (ILSS) and flexural strength (FS) respectively. At CT, the highest improvement of 20.780% and 5.347% in ILSS and FS was observed respectively. Scanning electron microscope was used to carry out the fractography of failed samples to understand the dominant mode of failure.