Huang Kun, Yao Ji
Department of Engineering Mechanics, Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China.
Yunnan Key Laboratory of Disaster Reduction in Civil Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Nanomaterials (Basel). 2021 Apr 5;11(4):923. doi: 10.3390/nano11040923.
The potential application field of single-walled carbon nanotubes (SWCNTs) is immense, due to their remarkable mechanical and electrical properties. However, their mechanical properties under combined physical fields have not attracted researchers' attention. For the first time, the present paper proposes beam theory to model SWCNTs' mechanical properties under combined temperature and electrostatic fields. Unlike the classical Bernoulli-Euler beam model, this new model has independent extensional stiffness and bending stiffness. Static bending, buckling, and nonlinear vibrations are investigated through the classical beam model and the new model. The results show that the classical beam model significantly underestimates the influence of temperature and electrostatic fields on the mechanical properties of SWCNTs because the model overestimates the bending stiffness. The results also suggest that it may be necessary to re-examine the accuracy of the classical beam model of SWCNTs.
由于单壁碳纳米管（SWCNTs）具有卓越的机械和电学性能，其潜在应用领域极为广阔。然而，它们在复合物理场下的机械性能尚未引起研究人员的关注。本文首次提出梁理论，以模拟单壁碳纳米管在温度和静电场复合作用下的机械性能。与经典的伯努利 - 欧拉梁模型不同，这个新模型具有独立的拉伸刚度和弯曲刚度。通过经典梁模型和新模型对静态弯曲、屈曲和非线性振动进行了研究。结果表明，经典梁模型显著低估了温度和静电场对单壁碳纳米管机械性能的影响，因为该模型高估了弯曲刚度。结果还表明，可能有必要重新审视单壁碳纳米管经典梁模型的准确性。
