Effect of stacking sequence on dynamic mechanical properties of Indian almond – Kenaf fiber reinforced hybrid composites

ABSTRACT

In this investigation, the dynamic mechanical properties of Indian almond – Kenaf fiber composite were investigated and the effect of stacking sequence was analyzed. Four types of composites viz. kenaf, Kenaf/Indian almond/Kenaf, Indian almond/Kenaf/Indian almond, and Indian almond were fabricated by hand layup technique. The experimental results revealed that the kenaf fiber composite showed the superior storage modulus and loss modulus values compared to all other composites due to the high stiffness of kenaf fiber and better bonding between the matrix and fiber. Among hybrid composites, Kenaf/Indian almond/Kenaf composite displayed a greater storage modulus and loss modulus than Indian almond/Kenaf/Indian almond composite due to the presence of two layers of high stiffness kenaf fiber. Further, the order of thermal stability of the composites was observed as: Kenaf > Kenaf/Indian almond/Kenaf > Indian almond/Kenaf/Indian almond > Indian almond. In addition, the Indian almond fiber composite and Indian almond/Kenaf/Indian almond composite exhibited good damping properties than other composites owing to the more mobility of polymer chain. Cole – cole plot showed that the structure of all the fabricated composites was heterogeneous in nature and kenaf fiber composite displayed the higher heterogeneity among all other materials. Moreover, the modeling of storage modulus and damping factor was performed and compared with the experimental results. The results showed good agreement with the theoretical and experimental values.

摘要

研究了印度杏仁-红麻纤维复合材料的动态力学性能, 分析了堆积顺序对复合材料力学性能的影响. 采用手工叠层技术制备了红麻, 红麻/印度杏仁/红麻, 印度杏仁/红麻/印度杏仁和印度杏仁四种复合材料. 实验结果表明, 红麻纤维复合材料具有较高的刚度和较好的基体与纤维之间的结合力, 因而具有比其他复合材料更高的储能模量和损耗模量值. 在混杂复合材料中, 由于两层高刚度红麻纤维的存在, 红麻/印度杏仁/红麻复合材料的储能模量和损耗模量均高于印度杏仁/红麻/印度杏仁复合材料. 复合材料的热稳定性顺序为:红麻>红麻/印度杏仁/红麻>印度杏仁/红麻杏仁>印度杏仁. 此外, 印度杏仁纤维复合材料和印度杏仁/红麻/印度杏仁复合材料由于其高分子链的流动性较大而表现出良好的阻尼性能. Cole-Cole图表明, 所制备的复合材料的结构在性质上是不均匀的, 红麻纤维复合材料在其他材料中表现出较高的非均匀性. 此外, 还对储能模量和阻尼因子进行了建模, 并与实验结果进行了比较. 实验结果与理论值和实验值吻合良好.

关键词:

• 印度杏仁纤维
• 红麻纤维
• 混杂复合材料
• 动态力学分析
• 叠加顺序

KEYWORDS:

• Indian almond fiber
• Kenaf fiber
• Hybrid composites
• Dynamic mechanical analysis
• Stacking sequence