Experimental Investigation of Pseudo-Ductile Behavior in Hybrid Sisal–Carbon Fiber Reinforced Epoxy Composites
Abstract
Fiber-reinforced polymer (FRP) composites generally show brittle breakdown, which restricts their structural reliability. This study aims to develop hybrid sisal– carbon/epoxy composites with pseudo-ductile behavior using the concepts of fiber hybridization and orientation. Stacking sequences in hybrid laminates [±30°s/0c]₁, [±45°s/0c]₁, and [±60°s/0c]₁ were fabricated, where sisal fibres acted as higher elongation reinforcement and carbon fibres provide superior strength and strength. Tensile testing were carried out in accordance with ASTM D3039 to evaluate the mechanical performance and failure characteristics. The results showed positive hybridization effects for all laminate configurations, indicating improved load sharing between fibers. However, the [±45°s/0c]₁ laminate exhibited reduced failure strain due to shear failure of sisal plies. The study demonstrates that pseudoductile behavior in hybrid laminates depends on carbon ply thickness, laminate thickness ratio, and mode-II interlaminar energy release rate. Keywords: Pseudo-ductility, Fiber hybridization, Fiber orientation
References
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