Meliande Natalin Michele, Silveira Pedro Henrique Poubel Mendonça da, Monteiro Sergio Neves, Nascimento Lucio Fabio Cassiano
Department of Materials Science, Military Institute of Engineering-IME, Praça General Tibúrcio, 80, Urca, Rio de Janeiro 22290-270, Brazil.
Polymers (Basel). 2022 Jun 26;14(13):2588. doi: 10.3390/polym14132588.
A typical ballistic protection helmet for ground military troops has an inside laminate polymer composite reinforced with 19 layers of the aramid, which are neither recyclable or biodegradable and are relatively expensive. The hybridization of synthetic aramid with a natural lignocellulosic fiber (NLF) can provide a lower cost and desirable sustainability to the helmet. In the present work, the curaua fiber, one of the strongest NLFs, is, for the first time, considered in non-woven mat layers to partially replace the aramid woven fabric layers. To investigate the possible advantage of this replacement, the tensile and impact properties of aramid/curaua hybrid laminated composites intended for ballistic helmets, in which up to four layers of curaua were substituted for the aramid, were evaluated. Tensile strength, toughness, and elastic modulus decreased with the replacement of the aramid while the deformation of rupture was improved for the replacement of nine aramid layers by two layers of curaua. Preliminary impact tests corroborate the decreasing tendency found in the tensile properties with the replacement of the aramid by curaua. Novel proposed Reduction Maps showed that, except for the replacement of four aramid layers by one layer of curaua, the decrease percentage of any tensile property value was lower than the corresponding volume percentage of replaced aramid, which revealed advantageous hybridization for the replacement of nine or more aramid layers.
一种典型的地面部队用防弹头盔内部有一层由19层芳纶增强的层压聚合物复合材料，这种材料既不可回收也不可生物降解，而且相对昂贵。将合成芳纶与天然木质纤维素纤维（NLF）进行混合，可以降低头盔成本并实现理想的可持续性。在本研究中，首次考虑在非织造垫层中使用最强的NLF之一——库拉索纤维，以部分替代芳纶机织物层。为了研究这种替代的潜在优势，对用于防弹头盔的芳纶/库拉索混杂层压复合材料的拉伸和冲击性能进行了评估，其中用多达四层库拉索纤维替代芳纶。随着芳纶被替代，拉伸强度、韧性和弹性模量降低，而用两层库拉索纤维替代九层芳纶时，断裂变形得到改善。初步冲击试验证实了随着库拉索纤维替代芳纶，拉伸性能呈下降趋势。新提出的减量图表明，除了用一层库拉索纤维替代四层芳纶外，任何拉伸性能值的下降百分比都低于被替代芳纶的相应体积百分比，这表明用库拉索纤维替代九层或更多层芳纶具有有利的混杂效果。
