Today, natural fiber composites are widely used instead of synthetic fibers due to their advantages such as: biodegradability, low density, low cost and special mechanical properties comparable to glass fibers. Despite the mentioned advantages, natural fiber composites have disadvantages such as hydrophilic nature, relatively poor thermal stability, incompatibility with polymer matrices which leads to loss of mechanical properties as well as brittle fracture behavior of the final sample and no bearing after failure. According to the studies, the aim of this study is to increase the energy absorption of jute fiber reinforced composites. To achieve this goal, hybridization of jute fibers with rice wires was used. In addition to having good mechanical properties, brass wire has a much higher plastic strain than other metals, which can play an effective role in increasing the energy absorption of natural fiber composites. In this study, the effect of relative volume fraction of rice wire on jute / epoxy composite was studied. One jute-epoxy sample and four jute-brass hybrid composite samples were made with different volume fractions. Tensile, Charpie impact and three-point bending tests were used to eva‎luate the performance of composite specimens. In addition, the effect of the presence of rice wire on the rate of loss of mechanical properties of jute / epoxy composite due to impact by low energy impact was studied. In this study, the effect of relative volume fraction of rice wire on jute / epoxy composite was studied. One jute-epoxy sample and four jute-brass hybrid composite samples were made with different volume fractions. Tensile, Charpie impact and three-point bending tests were used to eva‎luate the performance of composite specimens. In addition, the effect of the presence of rice wire on the rate of loss of mechanical properties of jute / epoxy composite due to impact by low energy impact was studied. The results of Charpi impact test showed an increase in energy absorption of jute / epoxy composite with the addition of brass metal wire and also an increase in its relative volume fraction. Brass metal by 88.94%, and by adding 5% brass metal wire by 231.25%, compared to the jute-epoxy sample, the impact energy has increased. The results of tensile and flexural tests after low-energy impact damage showed that the presence of brass metal wire reduces the amount of bending and tensile properties of jute / epoxy composite after impact.

محمد شيخ زاده

حسين حسني، مهدي حجازي