玻璃纤维/大麻纤维增强聚丙烯混杂复合材料的力学性能和断裂特征(英文)

Mechanical Property and Fracture Characteristics of Glass and Jute Fiber Reinforced Polypropylene Hybrid Composites

目前在土木工程,建筑,汽车等领域里使用的复合材料中,玻璃纤维是用量最大的增强材料。由于保护地球环境的呼声日趋高涨,天然纤维被期待着代替源于石油而且再利用困难的玻璃纤维,成为绿色复合材料的必要材料之一。本文通过注射成型工艺制作了玻璃短纤维,大麻短纤维以及混杂型纤维增强复合材料,并在拉伸实验中应用两种不同频率的声发射技术检测了拉伸断裂特性。实验发现,随着大麻纤维的加入和混杂复合材料绿色度的增加,复合材料的拉伸弹性模量随之线性增大,而拉伸强度基本保持不变。当大麻纤维的含量超过20wt%的时候,拉伸强度开始降低。在不同频率的声发射实验中,混杂型复合材料的声发射事件的产生都比单一纤维增强型复合材料要来的晚,也就是说,纤维的混杂有助于推迟微裂纹的产生。

Due to the increasing high concerns on the sustainability issues represented by the environment and resource protection,petro-based products are facing to be replaced by natural or recyclable materials.In this study,glass fiber(GF),jute fiber(JF)or hybrid([GF/JF])reinforced polypropylene(PP)composites were made by injection molding process and the fracture behavior in tensile test was characterized by using acoustic emission at two different frequencies.It is found that in [GF/JF]/PP hybrid composite,the optimum hybrid ratio exists for both high tensile modulus and tensile strength.At the same time,it is interesting to found that hybrid composites have AE generated stresses at a relatively big strain.That is to say,hybrid system is helpful to delay the fracture generation.