Anomalous Size Effect of Impact Resistance in Carbon Nanotube Film

作     者：Zhang, Wei Xiao, Kailu Hu, Dongmei Huang, Chenguang Wu, Xianqian 

作者机构：Institute of Mechanics Chinese Academy of Sciences Beijing100190 China Department of Materials Science & Engineering Texas A&M University Central Texas College StationTX77840 United States Key Laboratory of Multifunctional and Smart Systems Division of Advanced Materials Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou215123 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Kinetic energy 

摘      要：Dynamic mechanical behavior and size-related impact resistance of CNT films are studied by employing laser-induced projectile impact test (LIPIT) and coarse-grained molecular dynamics (CGMD) simulation. The energy dissipation mechanisms of the CNT films are investigated via CGMD simulations. An evident anomalous thickness-dependent effect is directly observed in the experiment, consistent with simulation phenomena. The mechanisms underlying this anomalous thickness-dependent effect are investigated at the atomic scale. The disparities between experiments and simulations are discussed. Our analysis of energy dissipation modes, deformation behaviors during impact, and impact area reveals that kinetic energy change predominantly governs the deformation mode. Meanwhile, a plugging failure mode near the exit face of CNT film is identified at high impact velocity (~ 160 m/s), leading to a deterioration in impact resistance and a corresponding reduction in SEA with increasing CNT film thickness. These findings provide a feasible strategy for the protection design of CNT film in broaden protective application scenarios. © 2024, The Authors. All rights reserved.