Abstract
Composite materials are widely used in various manufacturing fields from aeronautic and aerospace industries to the automotive industry. This is due to their outstanding mechanical properties with respect to their light weight. However, some studies showed that the major flaws of these materials are located at the fiber/matrix interface. Therefore, enhancing matrix adhesion properties could significantly improve the overall material characteristics. This study aims to analyze the effect of graphene particles on the adhesion properties of carbon fiber-reinforced polymer (CFRP) through interlaminar shear strength (ILSS) and flexural testing. Seven modified epoxy resins were prepared with different graphene contents. The CFRP laminates were next manufactured using a method that guarantees a repeatable and consistent fiber volume fraction with a low porosity level. Short beam shear and flexural tests were performed to compare the effect of graphene on the mechanical properties of the different laminates. It was found that 0.25 wt.% of graphene filler enhanced the flexural strength by 5%, whilst the higher concentrations (2 and 3 wt.%) decreased the flexural strength by about 7%. Regarding the ILSS, samples with low concentrations (0.25 and 0.5 wt.%) demonstrated a decent increase. Meanwhile, 3 wt.% slightly decreases the ILSS.
Highlights
Carbon fiber-reinforced polymer composites (CFRP) are increasingly being used in a wide range of domestic and industrial applications, such as aerospace, automobile, wind energy, sport, and goods industries, to name a few [1,2]
The results found of this study are the starting point to find the best filler percentage that improves the machinability of carbon fiber-reinforced polymer (CFRP)
Consistent fiber volume fraction is a must to distinguish between the effect of thickness variations and the effect of graphene particles
Summary
Carbon fiber-reinforced polymer composites (CFRP) are increasingly being used in a wide range of domestic and industrial applications, such as aerospace, automobile, wind energy, sport, and goods industries, to name a few [1,2]. Owing to their advantageous properties like corrosion resistance, temperature resistance, light weight, and high mechanical properties, more than 50% of new aircrafts (Airbus A350 and Boeing 787) are composed of CFRP [3,4]. As a solution for interfacial weaknesses, researchers have sought to incorporate fillers in the matrix These fillers have great potential to ameliorate the mechanical, chemical, and physical properties of the polymer.
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