Neves Pamela Pinto, Costa Ulisses Oliveira, Bezerra Wendell Bruno Almeida, Figueiredo André Ben-Hur da Silva, Monteiro Sergio Neves, Nascimento Lucio Fabio Cassiano
Department of Materials Science, Military Institute of Engineering, IME, Rio de Janeiro 22290-270, Brazil.
Polymers (Basel). 2022 Aug 10;14(16):3249. doi: 10.3390/polym14163249.
Replacing synthetic fibers with natural ones as reinforcement in polymeric composites is an alternative to contribute to sustainability. Pineapple leaf fibers (PALF) have specific mechanical properties that allow their use as reinforcement. Further, graphene oxide (GO) has aroused interest due to its distinctive properties that allow the improvement of fiber/matrix interfacial adhesion. Thus, this work aimed to evaluate the ballistic performance and energy absorption properties of PALF-reinforced composites, presenting different conditions (i.e., GO-functionalization, and variation of fibers volume fraction and arrangement) through residual velocity and Izod impact tests. ANOVA was used to verify the variability and reliability of the results. SEM was employed to visualize the failure mechanisms. The Izod impact results revealed a significant increase in the absorbed energy with the increment of fiber volume fraction for the unidirectional configuration. The ballistic results indicated that the bidirectional arrangement was responsible for better physical integrity after the projectile impact. Furthermore, bidirectional samples containing 30 vol.% of GO non-functionalized fibers in a GO-reinforced matrix showed the best results, indicating its possible application as a second layer in multilayered armor systems.
在聚合物复合材料中用天然纤维替代合成纤维作为增强材料是促进可持续发展的一种选择。菠萝叶纤维（PALF）具有特定的机械性能，使其能够用作增强材料。此外，氧化石墨烯（GO）因其独特的性能而引起关注，这些性能有助于改善纤维/基体界面粘附力。因此，本工作旨在通过剩余速度和悬臂梁冲击试验，评估PALF增强复合材料在不同条件下（即GO功能化、纤维体积分数和排列的变化）的弹道性能和能量吸收特性。采用方差分析来验证结果的可变性和可靠性。利用扫描电子显微镜（SEM）观察失效机制。悬臂梁冲击试验结果表明，对于单向配置，随着纤维体积分数的增加，吸收能量显著增加。弹道试验结果表明，双向排列有助于弹丸冲击后保持更好的物理完整性。此外，在GO增强基体中含有30 vol.%未功能化GO纤维的双向样品表现出最佳结果，表明其有可能作为多层装甲系统的第二层应用。
