碳纤维/环氧树脂复合材料高速冲击性能

采用树脂传递模塑(RTM)工艺制备碳纤维/环氧树脂复合材料,通过空气炮冲击实验研究树脂韧性和碳纤维类型对复合材料抗高速冲击性能的影响,并对高速冲击后的试样进行压缩性能测试,研究高速冲击损伤对复合材料剩余压缩性能的影响。结果表明:树脂的韧性可以降低复合材料遭受高速冲击时的内部损伤程度,大幅提高复合材料的抗高速冲击性能和冲击后剩余压缩性能;T700S碳纤维增强复合材料抗高速冲击性能优于T800H碳纤维增强复合材料;复合材料的破坏模式与冲击速率有关,冲击速率较低时,复合材料弹击面出现圆形凹坑,背弹面出现鼓包;冲击速率较高时,复合材料弹击面出现圆形通孔,背弹面出现沿纤维方向撕裂断口。

High speed impact properties of carbon fiber/epoxy resin composites

The carbon fiber/epoxy resin composites were prepared by the resin transfer molding (RTM) process. Effect of resin toughness and carbon fiber type on the high speed impact properties was investigated using the air cannon impact test. The effect of high speed impact damage on the residual compressive property of the composites was studied by the compression performance test of the samples which were impacted at high speed. The results demonstrate that the resin toughness can greatly reduce the internal damage degree of composite materials subjected to high speed impact, and can improve the anti-high speed impact property and residual compressive property of the composites. Also, the anti-high speed impact property of T700S carbon fiber reinforced composites is superior to that of the T800H carbon fiber reinforced composites. The results also indicate that failure modes are highly dependent on the impact velocity. Specifically, when the impact velocity is low, the composites appear a circular pit on the impact surface while the back surface appears a convex protrusion. Also, when the impact velocity is high, a circular hole is formed on the impact surface of composites, and the tearing fracture along the fiber direction is observed on the back surface.