Kandemir Ali, Pozegic Thomas R, Hamerton Ian, Eichhorn Stephen J, Longana Marco L
Bristol Composites Institute (ACCIS), Department of Aerospace Engineering, School of Civil, Aerospace, and Mechanical Engineering, Queen's Building, University of Bristol, University Walk, Bristol BS8 1TR, UK.
Materials (Basel). 2020 May 4;13(9):2129. doi: 10.3390/ma13092129.
Growing environmental concerns and stringent waste-flow regulations make the development of sustainable composites a current industrial necessity. Natural fibre reinforcements are derived from renewable resources and are both cheap and biodegradable. When they are produced using eco-friendly, low hazard processes, then they can be considered as a sustainable source of fibrous reinforcement. Furthermore, their specific mechanical properties are comparable to commonly used, non-environmentally friendly glass-fibres. In this study, four types of abundant natural fibres (jute, kenaf, curaua, and flax) are investigated as naturally-derived constituents for high performance composites. Physical, thermal, and mechanical properties of the natural fibres are examined to evaluate their suitability as discontinuous reinforcements whilst also generating a database for material selection. Single fibre tensile and microbond tests were performed to obtain stiffness, strength, elongation, and interfacial shear strength of the fibres with an epoxy resin. Moreover, the critical fibre lengths of the natural fibres, which are important for defining the mechanical performances of discontinuous and short fibre composites, were calculated for the purpose of possible processing of highly aligned discontinuous fibres. This study is informative regarding the selection of the type and length of natural fibres for the subsequent production of discontinuous fibre composites.
日益增长的环境问题和严格的废物流法规使得可持续复合材料的开发成为当前工业的必要需求。天然纤维增强材料源自可再生资源，既便宜又可生物降解。当它们采用环保、低危害的工艺生产时，就可以被视为一种可持续的纤维增强材料来源。此外，它们的特定机械性能与常用的、不环保的玻璃纤维相当。在本研究中，对四种丰富的天然纤维（黄麻、红麻、库阿索纤维和亚麻）作为高性能复合材料的天然衍生成分进行了研究。对天然纤维的物理、热学和力学性能进行了检测，以评估它们作为不连续增强材料的适用性，同时还生成了一个材料选择数据库。进行了单纤维拉伸和微粘结试验，以获得纤维与环氧树脂的刚度、强度、伸长率和界面剪切强度。此外，计算了天然纤维的临界纤维长度，这对于定义不连续和短纤维复合材料的力学性能很重要，目的是为了可能加工高度排列的不连续纤维。这项研究对于为后续生产不连续纤维复合材料选择天然纤维的类型和长度具有参考价值。
