In this paper, the Elastic moduli of defected and twisted carbon nanotubes (TCNTs) are described. A three-dimensional finite element (FE) model for this carbon nanotube is proposed. Owing to covalent bonds, the inter-atomic interactions are simulated by beam elements in the FE model. The elastic moduli of beam elements are ascertained from linkage between molecular and continuum mechanics. It is found that the torsional angle of TCNTs significantly affects Young’s and shear modulus. Based on the FE model, for TCNTs the values of the Young’s modulus have varied from 0.36 to 1.04 TPa and the values of the shear modulus have changed from 0.23 to 0.45 TPa. Also results show that defection in carbon nanotube (CNT) decreased the elastic moduli.
کلید واژگان :
elastic moduli, twisted carbon nanotubes, defected carbon nanotubes, finite element model
