Charpy Impact Tests in Epoxy Matrix Composites Reinforced with Malva Fibers

Abstract

Environmentally friendly materials are currently being investigated to replace synthetic materials, usually more expensive, more polluting and less sustainable. Indeed polymer matrix composites reinforced with natural fibers is supposed to be applied in components such as helmets and shielding for which toughness is a major requirement. Therefore the present work evaluates the Charpy impact resistance of epoxy matrix composites, reinforced with 10, 20 and 30% in volume of continuous and aligned malva fibers (Urena Lobata, L). The impact tests were performed on standard specimens obtained by pressing mold and then cured for 24 hours. The results showed a significant increase in impact energy with the malva fibers incorporated fraction. The fracture surface was analyzed by scanning electron microscopy, SEM. The performance of the samples incorporated with 30% of malva fibers, suffered only partial rupture due to the difficulty imposed by breaking the malva fibers. The brittle matrix/fiber relation makes the cracks switch way to the interface between the malva fiber and epoxy matrix, which helps to absorb more impact energy.