Effect of aramid pulp on low temperature flexural properties of carbon fibre reinforced plastics
Effect of aramid pulp on low temperature flexural properties of carbon fibre reinforced plastics
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DOI：
10.1016/j.compscitech.2020.108095
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发表时间：
2020-05-26
影响因子：
9.1
通讯作者：
Hu, Xiaozhi
中科院分区：
文献类型：
--
作者：
Hu, Yunsen;Cheng, Fei;Hu, Xiaozhi
对层状结构芳纶浆(AP)纤维多层界面增强碳纤维增强塑料(CFRPs)在-40℃和-100℃三点弯曲(3PB)下的弯曲性能进行了测试，并与未增强CFRPs进行了对比。烘烤后，在0.8、1.6和3.2g/m(2)三种不同的AP面密度下，叶间厚度分别为3.3、5.6和12.2亩。3在20℃下进行了对照和AP增强CFRPS的PB试验，比较了AP的增强效果及其从室温到-100℃的变化。在-100℃下，添加1.6g/m(2)AP的试件的弯曲强度比室温下的24.5%提高了30.6%。这一发现证明，合理的复合材料设计，即在脆性纤维和脆性基质系统中添加韧性和柔性的短纤维，确实可以提高CFRPS的结构性能。本研究中采用的小规模内部预浸料制造表明，AP纤维的超薄层可以潜在地并入大规模预浸料生产中，从而可以从复合材料成型过程中省去插入交错层的额外步骤。换句话说，终端用户可以使用AP增韧预浸料，就像目前使用的任何碳纤维预浸料一样，而不需要交错。
Flexural properties of carbon fibre reinforced plastics (CFRPs) with multi-layer interfacial reinforcement of hierarchically structured aramid pulp (AP) fibres were measured at -40 and -100 degrees C under three-point bending (3 PB) together with unreinforced CFRPs. After curing, the 'interleaf' thicknesses were 3.3, 5.6 and 12.2 mu m for three different AP areal densities of 0.8, 1.6 and 3.2 g/m(2), respectively. 3 PB tests of control and AP reinforced CFRPs were also performed at 20 degrees C to compare the AP strengthening effects and their variations from ambient temperature to -100 degrees C. The flexural strength increased up to 30.6% at -100 degrees C for specimens with 1.6 g/m(2) AP in comparison to 24.5% enhancement at room temperature. This finding proves that a proper composite design, i.e. adding tough and flexible short fibres into the brittle-fibre and brittle-matrix system, can indeed enhance the structural performance of CFRPs. The small-scale in-house 'pre-preg' fabrication adopted in this study shows that the ultra-thin layers of AP fibres can be potentially incorporated into a large-scale pre-preg production so that the extra step of inserting the interleaving layers can be removed from the composite forming process. In other words, end users can use the AP toughened pre-pregs just like any carbon fibre pre-pregs currently in use without the trouble of interleaving.