Volume 09,Issue 02

Thermal Effect on The Post-buckling And Mechanical Response of Single-Walled Carbon Nanotubes: A Numerical Investigation

Authors

Sima Besharat Ferdosi

Abstract
The subject of this article is the study of the post-buckling behavior of single-walled carbon nanotubes (SWCNT) under various thermal conditions, different lengths, and chiralities. The critical buckling loads should be found first to investigate the post-buckling behavior. Then the buckling modes are used as a geometrical imperfection to analyze the post-buckling path. For post-buckling analysis, the boundary conditions are assumed to be clamped. A space-frame model is here employed for the zigzag and armchair nanotubes with different chiralities and aspect ratios. This approach models the linkage between carbon atoms as a three-dimensional elastic beam. The sectional property parameters of these beam members are obtained by establishing a linkage between structural and molecular mechanics. This strategy is far more affordable and faster than the molecular dynamics simulation technology approach, which was previously used. The obtained results indicate that, as expected, the critical buckling load decreases by increasing the aspect ratio of the nanotubes as well as chirality. Also, it is noticed that the post-buckling behavior of both armchair and zigzag nanotubes are quite similar. In addition, the effect of temperature on the post-buckling behavior is investigated. Due to the influence of temperature over the linkage length and force field constants it is shown that when the temperature increases a decline in the critical buckling loads is observed and the post-buckling path also goes through this decreasing process. It is the same for both nanotubes.

Keyword: Carbon nanotubes, Buckling, Post-buckling, Imperfection, Thermal Analysis, Numerical simulation, Structural mechanics.

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