Mechanical properties investigation of defected, twisted, elliptic, bended and hetero-junction carbon nanotubes based on FEM

In this paper, the elastic moduli of defected, twisted, elliptic, bended and hetero-junction carbon nanotubes (CNTs) are described. A three-dimensional finite element (FE) modelof space-frame structure is proposed for these (CNTs). It is found that the torsional angle of twisted (CNTs), the cross sectional aspect ratio (a/b) of elliptic (CNTs), the bending angle of bended (CNTs) and the choice of the length and the chirality of hetero-junction carbon nanotubes (HJCNTs) significantly affect mechanical properties. The values of the Young’s modulus have varied from 0.99 to 0.999 TPa for defected, 0.36 to 1.04 TPa for twisted, 0.87 to 1.04 TPa for elliptic, 0.95 to 1.04 for bended nanotubes and 0.96 to 1.27 TPa for HJCNTs. The results demonstrate that the proposed FE model is a valuable tool to study the mechanical behavior of HJCNTs and the deformed CNT. Different kinds of defects and deformations decrease the mechanical properties of CNTs.

Elastic moduli, hetero-junction carbon nanotubes, bended carbon nanotubes, elliptic carbon nanotubes, twisted carbon nanotubes, FEM