Influence of Walnut (Juglans L.) Shell Particles Addition on the Mechanical Properties of Epoxy Composites

Abstract

The primary objective of this research work is to explore the potential of walnut shell particles as a reinforcing agent in the thermoset matrix composite. Therefore, the number of composite samples was developed by varying the filler weight percentage (15%, 25%, 35%, and 45%) in an epoxy polymer. The composite samples were characterized in terms of mechanical properties by using tensile test, flexural or three-point bending test, Izod impact test, compression test, and Rockwell hardness test. Moreover, the effect of cellulosic filler content on the density and water absorptivity of epoxy-based composites was also investigated as per the ASTM standard. Agricultural waste in the form of walnut shell was characterized by the determination of grain size. The experimental results showed that the stiffness and hardness of epoxy thermoset were increased with the decrease in tensile and flexural strength after the addition of walnut shell fine particles. The composite of 35 wt% walnut filler exhibits a balanced combination of strength, stiffness, and toughness. It was found that the mechanical strength and modulus of filled composites were increased with the increase of filler content up to 35 wt%.