A temperature related study on bifurcation strain and force of carbon nanotubes

作者：Zhao Huichuan; Bian Lichun; Pan Jing

来源：Computational Materials Science, 2015, 109: 129-136.

DOI：10.1016/j.commatsci.2015.07.015

• Continuum theory
• Interatomic potential
• Helmholtz free energy
• Local harmonic approximation
• Finite temperature

In this paper, a new continuum theory incorporating interatomic potentials and finite temperature is developed to study the bifurcation strain and force of single-walled carbon nanotube (SWNT) under the action of tension. The effect of a finite temperature is studied using the Helmholtz free energy and the local harmonic approximation. The bifurcation strain and force of SWNT subjected to tension versus finite temperatures are predicted. It is found that the bifurcation strain of SWNT under the tension decreases almost monotonically with increasing temperatures. The bifurcation force of SWNT decreases with increasing temperatures, however, it increases with the increase of bifurcation strain and radius of SWNT. The relation between Young's modulus and the temperature is also investigated.

• 出版日期2015-11
• 单位燕山大学