Investigation of temperature effect on the mechanical properties of single-walled carbon nanotubes
Investigation of temperature effect on the mechanical properties of single-walled carbon nanotubes
复制标题
DOI：
10.1016/j.compstruct.2011.03.007
复制
发表时间：
2011-08
影响因子：
6.3
通讯作者：
K. Liew;J. Yan;Yuzhou Sun;Linghui He
中科院分区：
文献类型：
--
作者：
K. Liew;J. Yan;Yuzhou Sun;Linghui He
提出了一种与温度相关的高阶梯度连续介质理论，用于预测单壁碳纳米管（SWCNTs）在不同温度下的力学性能。结果表明，半径相近的之字形（21,0）、扶手形（12,12）和手性（15,9）SWCNTs的轴向弹性模量在ent = 0 K时接近0.7 TPa，但在不同坡度上略有下降。这些结果表明，温度效应对之字形SWCNTs轴向杨氏模量的影响小于其他类型SWCNTs。此外，还对不同温度下纵向和周向均匀拉伸对应的参数λ1和λ2进行了分析，结果表明，随着温度的升高，所有SWCNTs都在纵向上被拉伸，而在周向上，只有锯齿形SWCNTs被拉伸，其他SWCNTs都被压缩。
A temperature-related higher-order gradient continuum theory is proposed for predicting the mechanical properties of single-walled carbon nanotubes (SWCNTs) at various temperatures. It is found that the axial elastic moduli of zigzag (21, 0), armchair (12, 12) and chiral (15, 9) SWCNTs with similar radii approach 0.7 TPa whenT= 0 K, but decline slightly on different slopes. These results indicate that the temperature effect influences the axial Young moduli of zigzag SWCNTs less than those of the other types. Moreover, the parametersλ1andλ2corresponding to the uniform longitudinal and circumferential stretches at different temperatures are also examined, and the results show that with an increasing temperature, all SWCNTs are stretched in the longitudinal direction, while in the circumferential direction, only the zigzag SWCNTs are stretched, whereas the others are compressed.