High-strength and high-modulus polyimide fiber is a kind of high-performance organic fiber rapidly developing in recent years. Taking advantage of its high strength and toughness and being combined with carbon fiber, it is expected to make a balance between stiffness and toughness, so as to afford a kind of structural composite with high strength and toughness. In this study, a series of hybrid fiber reinforced composites were prepared with high-strength and high-modulus PI fiber and carbon fiber as reinforcements. The effects of stacking sequence and hybrid ratio on the tensile, compressive and flexural properties and failure modes of the composites were systematically investigated. Experimental results showed that tensile, compressive and flexural properties of the hybrid composites were markedly improved compared with polyimide fiber composite, while failure strain and failure energy were superior to those of the carbon fiber composites. The flexural properties were largely affected by the stacking sequence. Hybrid composites with carbon fiber as the compressive side showed higher flexural strength, while the ones with carbon fiber as both compressive side and tensile side had higher flexural modulus.

高强度高模量的聚酰亚胺纤维是近年来发展迅速的一种高性能有机纤维。期望利用其高强度和韧性并与碳纤维结合，在刚性和韧性之间取得平衡，从而提供一种具有高强度和韧性的结构复合材料。本研究以高强度高模量PI纤维和碳纤维为增强材料制备了一系列混杂纤维增强复合材料。系统研究了堆垛顺序和混合比对复合材料拉伸，压缩和弯曲性能及破坏模式的影响。实验结果表明，与聚酰亚胺纤维复合材料相比，杂化复合材料的拉伸，压缩和弯曲性能明显改善，而破坏应变和破坏能量优于碳纤维复合材料。弯曲性能在很大程度上受堆积顺序的影响。以碳纤维为压缩面的杂化复合材料具有较高的抗弯强度，而以碳纤维为压缩面和拉伸面的杂化复合材料均具有较高的弯曲模量。