ABSTRACT

This paper has presented the enhancement of tensile and impact strength of continuously aligned sisal fiber reinforced polyester composites through chemical treatment and hybridization. Sodium hydroxide (NaOH) and baking soda (NaHCO₃) were used for sisal fiber treatment. Comparisons on the effect of sodium hydroxide and baking soda treatments on tensile and impact strength of the composites were performed. Unidirectional glass and carbon fibers were selected as hybrid fibers. Nineteen laminates were prepared as per the standards. The laminates were made of pure sisal fiber and hybridized with glass or carbon fibers at different stacking sequence, orientation, and volume fraction. The effects of glass and carbon fibers hybridization on tensile and impact strength of the composites were studied and compared. Further enhancements on the tensile and impact strength of the composites were investigated through alterations on the stacking sequence, orientation, and volume fraction of the hybrid fibers. Symmetric hybrid composites which avoided sisal/sisal plies interface have shown more than 95% and 130% rise in their tensile strength by adding about 8% volume of glass and carbon fibers respectively. Moreover, with only about 8% carbon fiber inclusion in the laminates, almost 60% improvements in the impact strength were discovered.

摘要

本文介绍了通过化学处理和杂化提高连续排列剑麻纤维增强聚酯复合材料的拉伸和冲击强度。氢氧化钠 (NaOH) 和小苏打 (NaHCO ₃) 用于剑麻纤维处理。比较了氢氧化钠和小苏打处理对复合材料拉伸和冲击强度的影响。选择单向玻璃和碳纤维作为混合纤维。按照标准制备了十九个层压板。层压板由纯剑麻纤维制成，并以不同的堆叠顺序、方向和体积分数与玻璃或碳纤维混合。研究并比较了玻璃和碳纤维杂化对复合材料拉伸和冲击强度的影响。通过改变混合纤维的堆叠顺序、取向和体积分数，进一步提高了复合材料的拉伸和冲击强度。通过分别添加约 8% 体积的玻璃和碳纤维，避免剑麻/剑麻层界面的对称混合复合材料的拉伸强度提高了 95% 和 130% 以上。此外，层压板中仅包含约 8% 的碳纤维，发现冲击强度提高了近 60%。