Influence of cryogenic temperature on mechanical behavior of graphene carboxyl grafted carbon fiber reinforced polymer composites: An emphasis on concentration of nanofillers. (August 2020)

• Record Type: Journal Article
• Authors: Patnaik, Satyaroop; Gangineni, Pavan Kumar; Prusty, Rajesh Kumar
• Is Part Of: Composites communications. Volume 20(2020)
• Publication Date: 2020-08
• Subjects: Carbon fibers -- Graphene carboxyl -- Electrophoretic deposition -- Cryogenic temperature -- Mechanical testing
• DOI: 10.1016/j.coco.2020.100369
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: 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. Highlights: Fiber modification improves the mechanical performance of CFRP at both RT and CT. The decrease in mechanical properties at CT is due to thermal shock. At cryogenic temperatures, matrix failure is more dominant than interface failure.