Effect of Moisture Absorption on Mode II Fracture Behavior of Fumed Silica Reinforced Hybrid Fiber Composite

ABSTRACT

This work aims to investigate the influence of water ingression on Mode II interlaminar fracture behavior of a fumed silica-reinforced jute-kevlar hybrid nanocomposite. Shear mode of failure is characterized by using End Notched Flexure (ENF) specimens. Thirteen different composites are prepared based on four layering sequences (i.e., Jute-Jute-Jute-Jute [JJJJ], Jute-Kevlar-Kevlar-Jute [JKKJ], Kevlar-Jute-Jute-Kevlar [KJJK], and Kevlar-Kevlar-Kevlar-Kevlar [KKKK]) and four nanofiller weight proportions (0, 1.5, 3, and 4.5%), with the aim of studying the impact of the layering sequence and nanofiller proportion. Initiation fracture toughness (G_{IIC init.}) is reported for dry and wet conditions of the composites using the Simple Beam Theory (SBT) data reduction method. Among the reported stacking sequences, the stacking sequence JKKJ possesses the highest fracture-resistant material in both dry and wet conditions because of the active involvement of the fiber and matrices at the interlaminar layer resulting from interlaminar crack propagation. The water-aged composite JKKJ with a 3% nanofiller weight proportion shows the highest initiation fracture toughness (G_{IIC init.}) value, 1811.4 J/m². The composite with the stacking sequence JKKJ and 3% nanofiller weight proportion is recommended, which is proved to be the best Mode II fracture-resistant material under wet conditions among the reported composites.

摘要

本工作旨在研究进水对气相二氧化硅增强黄麻-凯夫拉混杂纳米复合材料II型层间断裂行为的影响. 剪切破坏模式的特点是使用端部缺口弯曲 (ENF) 试样. 基于四种分层顺序 (即黄麻-黄麻-黄麻[JJJJ], 黄麻-凯夫拉尔-凯夫拉尔-黄麻[JKJ], 凯夫拉尔-凯夫拉尔-凯夫拉尔[KKK]和凯夫拉尔-凯夫拉尔-凯夫拉尔-凯夫拉尔[KKK]) 和四种纳米填料重量比例 (0, 1.5, 3和4.5%), 制备了13种不同的复合材料, 旨在研究分层顺序和纳米填料比例的影响. 起始断裂韧性 (GIIC初始) 使用简单梁理论 (SBT) 数据简化方法, 对复合材料的干燥和潮湿条件进行了报告. 在已报道的堆叠顺序中, 由于层间裂纹扩展导致的层间层中纤维和基质的积极参与, 堆叠JKKJ在干燥和潮湿条件下具有最高的抗断裂材料. 纳米填料重量比为3%的水老化复合材料JKKJ具有最高的起始断裂韧性 (GIIC init.) 值, 1811.4 J/m2. 建议采用堆叠顺序为JKKJ, 纳米填料重量比为3%的复合材料, 这被证明是所报道的复合材料中在潮湿条件下抗II型断裂性能最好的材料.

KEYWORDS:

• Interlaminar fracture toughness
• Jute
• fumed silica
• Kevlar
• Mode II
• nanocomposite

关键词:

• 层间断裂韧性
• 黄麻
• 气相二氧化硅
• 凯夫拉尔
• 模式二
• 纳米复合材料

Disclosure statement

No potential conflict of interest was reported by the author(s).