Effect of moisture absorption on the mechanical performance of natural fiber reinforced woven hybrid bio-composites

In the present study, moisture uptake behavior and their effect on mechanical properties of plant fibers were investigated while these fibers were reinforced with epoxy matrix. The developed composites were dipped in tap water for a span of 12 months at room temperature. Hardness (shore-D), tensile, and flexural properties were evaluated after 1 year immersion of samples in water and compared with that of the dry specimens. Water saturated jute/hemp/epoxy composite specimen showed the highest reduction in tensile strength and young's modulus by 46.9% and 51.8%, respectively. Water saturated hemp/epoxy composite specimen showed the highest reduction in flexural strength by 45.1%. Highest reduction of 39.7% in the flexural modulus was achieved by the jute/hemp/epoxy composite specimen. Hardness had observed no significant decrease in the values due to moisture absorption. scanning electron microscopy images of fractured surfaces of these bio-composites showed quite relevant information regarding weakening of fiber/matrix interface.