Evaluate the tensile, flexural and impact strength of hemp and flax based hybrid composites under cryogenic environment

Abstract In recent decades, natural fibers have emerged as a rising trend in materials research as a reinforcement for polymer matrix materials and as a replacement for non-biodegradable, non-renewable, and high-density synthetic fabrics. The main objective of this research is to examine the mechanical characteristics of hemp and flax-based hybrid composites reinforced with epoxy resin at cryogenic and room temperatures. The composites were made using a hand lay-up approach, with both fibers being prepared with a NaOH solution for 4 h to improve interfacial adhesion. It is apparent from this research that cryogenic temperature has a significant impact on the flexural, tensile and impact characteristics of polymer composites, and that these qualities vary depending on the amount of cryogenic treatment. After being submerged in liquid nitrogen for 15, 30, and 45 min, the specimens are tested for tensile, flexural, and impact characteristics. An untreated specimen has the highest tensile strength of 27.89 MPa, a flexural strength of 58.95 MPa, and impact strength of 10.94 kJ/m2, with the value decreasing as the curing period rises.