da Silva Thuane Teixeira, Silveira Pedro Henrique Poubel Mendonça da, Figueiredo André Ben-Hur da Silva, Monteiro Sérgio Neves, Ribeiro Matheus Pereira, Neuba Lucas de Mendonça, Simonassi Noan Tonini, Garcia Filho Fabio da Costa, Nascimento Lucio Fabio Cassiano
Department of Materials Science, Military Institute of Engineering-IME, Praça General Tibúrcio 80, Urca, Rio de Janeiro 22290-270, Brazil.
Advanced Materials Laboratory (LAMAV), Department of Materials Engineering, State University of the Northern Rio de Janeiro-UENF, Avenida Alberto Lamego, 2000, Campos dos Goytacazes 28013-602, Brazil.
Polymers (Basel). 2022 Sep 2;14(17):3629. doi: 10.3390/polym14173629.
Several industry sectors have sought to develop materials that combine lightness, strength and cost-effectiveness. Natural lignocellulosic natural fibers have demonstrated to be efficient in replacing synthetic fibers, owing to several advantages such as costs 50% lower than that of synthetic fibers and promising mechanical specific properties. Polymeric matrix composites that use kenaf fibers as reinforcement have shown strength increases of over 600%. This work aims to evaluate the performance of epoxy matrix composites reinforced with kenaf fibers, by means of dynamic-mechanical analysis (DMA) and ballistic test. Through DMA, it was possible to obtain the curves of storage modulus (E'), loss modulus (E″) and damping factor, Tan δ, of the composites. The variation of E' displayed an increase from 1540 MPa for the plain epoxy to 6550 MPa for the 30 vol.% kenaf fiber composites, which evidences the increase in viscoelastic stiffness of the composite. The increase in kenaf fiber content induced greater internal friction, resulting in superior E″. The Tan δ was considerably reduced with increasing reinforcement fraction, indicating better interfacial adhesion between the fiber and the matrix. Ballistic tests against 0.22 caliber ammunition revealed similar performance in terms of both residual and limit velocities for plain epoxy and 30 vol.% kenaf fiber composites. These results confirm the use of kenaf fiber as a promising reinforcement of polymer composites for automotive parts and encourage its possible application as a ballistic armor component.
几个行业都在寻求开发兼具轻质、高强度和成本效益的材料。天然木质纤维素纤维已证明在替代合成纤维方面具有成效，这得益于其诸多优势，比如成本比合成纤维低50%，且具有良好的机械特性。以红麻纤维作为增强材料的聚合物基复合材料的强度提高了600%以上。本研究旨在通过动态力学分析（DMA）和弹道测试来评估红麻纤维增强环氧基复合材料的性能。通过DMA，可以得到复合材料的储能模量（E'）、损耗模量（E″）和阻尼因子Tan δ的曲线。E'的变化显示，从纯环氧树脂的1540 MPa增加到30 vol.%红麻纤维复合材料的6550 MPa，这证明了复合材料粘弹性刚度的增加。红麻纤维含量的增加导致更大的内摩擦，从而使E″更高。随着增强材料比例的增加，Tan δ显著降低，表明纤维与基体之间的界面粘结更好。针对0.22口径弹药的弹道测试显示，纯环氧树脂和30 vol.%红麻纤维复合材料在残余速度和极限速度方面表现相似。这些结果证实了红麻纤维作为汽车零部件聚合物复合材料的一种有前景的增强材料的用途，并鼓励其作为防弹装甲部件的潜在应用。
