A multiscale approach is used here to investigate the impact properties of carbon fibre/carbon nanotube-reinforced polymer. For this purpose, the mechanical properties of the carbon nanotubes (CNTs) are obtained by molecular dynamics simulations. Then, they are included in the polyethene matrix, and the mechanical properties of CNT-reinforced polyethene are computed using a stochastic approach. Considering the CNT-reinforced polyethene as the matrix, the effect of adding the carbon fibres on its mechanical properties is investigated in the next step. Finally, utilizing a stochastic method, the macro-scale mechanical properties of carbon fibre/carbon nanotube-reinforced polymer are computed. Thereafter, the impact test is applied on the models. The finite element method is used to investigate the mechanical and impact properties of representative volume elements. The effects of waviness, volume percentage and aspect ratio of the carbon fibre and CNT on the mechanical properties of the multiscale composite are evaluated. It is shown that reinforcing the polyethene matrix by carbon fibres and CNTs significantly increases its impact resistance. Adding 3% and 5% volume percentages of CNT into 3%-carbon fibre/polyethene and 5%-carbon fibre/polyethene respectively, resulted in 26% and 47% improvement in the impact resistance of the composite.

这里使用多尺度方法来研究碳纤维/碳纳米管增强聚合物的冲击性能。为此，通过分子动力学模拟获得碳纳米管 (CNT) 的机械性能。然后，将它们包含在聚乙烯基体中，并使用随机方法计算碳纳米管增强聚乙烯的机械性能。以碳纳米管增强聚乙烯为基体，下一步研究添加碳纤维对其力学性能的影响。最后，利用随机方法，计算了碳纤维/碳纳米管增强聚合物的宏观力学性能。此后，对模型进行冲击测试。有限元方法用于研究代表性体积元素的机械和冲击特性。评估了碳纤维和碳纳米管的波纹度、体积百分比和纵横比对多尺度复合材料力学性能的影响。结果表明，通过碳纤维和碳纳米管增强聚乙烯基体可显着提高其抗冲击性。在 3%-碳纤维/聚乙烯和 5%-碳纤维/聚乙烯中分别加入 3% 和 5% 体积百分比的 CNT，使复合材料的抗冲击性提高 26% 和 47%。结果表明，通过碳纤维和碳纳米管增强聚乙烯基体可显着提高其抗冲击性。在3%-碳纤维/聚乙烯和5%-碳纤维/聚乙烯中分别加入3%和5%体积百分比的CNT，使复合材料的抗冲击性提高26%和47%。结果表明，通过碳纤维和碳纳米管增强聚乙烯基体可显着提高其抗冲击性。在 3%-碳纤维/聚乙烯和 5%-碳纤维/聚乙烯中分别加入 3% 和 5% 体积百分比的 CNT，使复合材料的抗冲击性提高 26% 和 47%。