【摘要】 碳纳米管（carbon nanotube, CNT）薄膜具有优异的比强度和比韧性，同时具有优良的导电性和储能特性，在人工肌肉、电子屏蔽及冲击防护等领域都具有广泛的应用前景。然而，目前相关研究主要集中在CNT薄膜的准静态力学性能，其抗冲击力学性能方面的研究尚欠缺。通过实验研究CNT薄膜在中、低速压入穿透下的力学行为，结合数值模拟分析发现：直径为1 mm的钢珠穿透单层CNT薄膜的临界穿透速度约为25m/s，最大吸能对应的速度约为30m/s；双层CNT薄膜的临界穿透速度约为40 m/s，最大吸能对应的速度约为60 m/s。与冲击破坏孔洞相比，准静态下CNT薄膜的破坏孔洞边缘更薄，拉伸变形更明显。通过水、润滑油、高真空润滑脂等中间界面改性，可以提升双层CNT薄膜的抗冲击力学性能和吸能效果。研究结果有助于更好地理解CNT薄膜的吸能机理，为防护结构设计提供参考。更多还原

【Abstract】 Carbon nanotube(CNT) films have broad application prospects in the fields of artificial muscles,electronic shielding, and impact protection, owing to their excellent mechanical and electrical conductivity properties. However, the latest studies mainly focus on the quasi-static mechanical properties of the CNT films, while the transverse impact mechanical properties and microscopic mechanisms are still under investigated. Herein, the mechanical behavior of CNT films under medium/low-speed penetration is experimentally and numerically investigated. The results show that the critical penetration speed of the single-layer CNT film is about 25 m/s, while the speed of the maximum energy absorption is about 30 m/s,for a 1 mm diameter steel ball impacting the CNT film. In contrast, the critical penetration speed of the double-layer CNT film is about 40 m/s, and the speed of the maximum energy absorption is about 60 m/s.Under the quasi-static condition, the damaged edge of the cavity in the CNT film is thinner and the stretching deformation is more prominent than those in the impact case; the intermediate interface modification by water, oil, and high vacuum grease can improve the impact mechanical properties and energy absorption effect of the double-layer CNT film. Overall, this work can provide a better understanding on the penetration mechanism of CNT films and guide the design of anti-impact structures.更多还原