双层碳纳米管薄膜的侵彻力学性能  

Penetration Mechanical Properties of Double-Layer Carbon Nanotube Films

作　　者：王文帅 王鹏飞[1] 田杰[2] 徐松林[1] WANG Wenshuai;WANG Pengfei;TIAN Jie;XU Songlin(CAS Key Laboratory of Mechanical Behavior and Design of Materials(LMBD),University of Science&Technology of China,Hefei 230026,Anhui,China;Engineering and Materials Science Experiment Center,University of Science&Technology of China,Hefei 230027,Anhui,China)

机构地区：[1]中国科学技术大学中国科学院材料力学行为和设计重点实验室,安徽合肥230026 [2]中国科学技术大学工程与材料科学实验中心,安徽合肥230027

出　　处：《高压物理学报》2022年第4期99-111,共13页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11872361);中央高校基本科研业务费专项资金(WK2480000008)。

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25 m/s,最大吸能对应的速度约为30 m/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。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.

关 键 词：碳纳米管薄膜 冲击 侵彻 界面 有限元模拟 

分 类 号：O385[理学—流体力学] O521.2[理学—力学]