Influence of stacking sequence on flax/kevlar hybrid epoxy composites: Mechanical and morphological studies

In this research work, the natural fiber reinforced hybrid epoxy composites were fabricated using the hand lay-up method. The flax and kevlar are used as a reinforcement and epoxy as a binding material. This study aims to analyze the influence of stacking sequence and hybridization on the mechanical, water absorption, and morphological properties of polymer composites. The results reveal that the neat kevlar reinforced composite achieved a maximum tensile strength, modulus, and impact strength of 189.94 MPa, 2345.35 MPa and 37.16 kJ/m(2) respectively with less water absorption behavior. Whereas, the hybrid composite with kevlar as an outer layers and flax as core layers was exhibited a maximum flexural strength, modulus, and inter laminar shear strength of 360.76, 37124.2, and 213.51 MPa, respectively. The water absorption percentage was more in neat natural flax reinforced epoxy composite due to its more hydrophilic nature. The scanning electron microscope analysis reveals the proper bonding and adhesion of both kevlar and flax fabrics with the epoxy matrix.

Automated summary

In this research, natural fiber reinforced hybrid epoxy composites were fabricated using the hand lay-up method to analyze the influence of stacking sequence and hybridization on the mechanical and water absorption properties. The results showed that the hybrid composite exhibited higher flexural strength and inter laminar shear strength, while the neat kevlar reinforced composite had lower water absorption. Scanning electron microscope analysis confirmed the proper bonding between fibers and the epoxy matrix.