Investigation on the Synergistic Effect of Hybrid Reinforcements on Mechanical and Tribological Performance of Polymer Matrix Composites

Abstract

Hybrid polymer matrix composites have gained significant attention due to their ability to achieve a balanced combination of mechanical
strength and tribological performance. In this study, the synergistic effect of hybrid reinforcements on the mechanical and wear behavior of
polymer composites is systematically investigated. Composites were fabricated using a combination of natural fiber (jute), synthetic fiber
(glass), and nano-fillers (Al₂O₃) within an epoxy matrix through the hand lay-up technique followed by compression molding. Mechanical
properties such as tensile strength, flexural strength, and impact resistance were evaluated using standard ASTM methods, while tribological
performance was assessed using a pin-on-disc apparatus under varying loads and sliding speeds. The results revealed that hybrid composites
exhibited significantly enhanced tensile and flexural strength compared to single fiber composites due to improved stress transfer and interfacial
bonding. Impact strength was also improved, indicating better energy absorption capability. Tribological analysis showed a reduction in wear
rate and coefficient of friction for hybrid composites, attributed to the formation of a stable tribo-layer and the presence of hard nano-fillers
that resist surface degradation. Scanning electron microscopy confirmed reduced fiber pull-out, minimal surface damage, and improved matrix–
reinforcement adhesion in hybrid systems. The development of polymer matrix composites (PMCs) has attracted extensive research interest
due to their potential to replace conventional materials in high-performance applications. Early studies primarily focused on single fiberreinforced composites, where synthetic fibers such as glass and carbon were widely used for their superior strength and stiffness. However,
these materials often exhibited limitations in terms of cost, environmental impact, and tribological performance under severe operating
conditions.