Buckling mode switching in self-similar nanotubes

Yun Che Wang, Chun Yi Wu

研究成果: Conference contribution

摘要

Mechanical buckling of single-wall, self-similar carbon nanotubes is investigated via Molecular Dynamics (MD) simulations with the second generation Tersoff-Brenner potential. The self-similar tubes are assumed to have the same aspect ratio (λ), defined as radius (R) divided by length (L). Four different types of armchair nanotubes were studied, i.e. (3, 3), (5, 5), (10, 10) and (15, 15). Buckling strain (εcr) is inferred from strain energy discontinuities while the tubes are under uniaxial compression. MD-calculated buckling strains are compared with experimental data of bulk cylindrical shells, as well as continuum shell buckling theories, including empirical formula. With the self-similarity, dependence of buckling strain on tube length may be characterized by the parameter, α= log(εcr)/log(L/t). It was found that the magnitude of α decreases as λ decreases, switching from the shell- to Euler-type buckling mode. Even within the shell buckling mode, the thickness parameter is different for different λ. It was found that, for λ=0.276, the wall thickness (t) of the nanotubes was estimated to be 0.066 nm in order for the shell theories predicting MD-calculated buckling strains. For λ=0.153, t was found to be 0.34 nm. In addition, under the self-similar condition, smaller nanotubes exhibit larger buckling strain, indicating that smaller tubes have higher buckling resistance.

原文English
主出版物標題Shell Structures
主出版物子標題Theory and Applications - Proceedings of the 10th SSTA 2013 Conference
頁面255-258
頁數4
出版狀態Published - 2014 一月 1
事件10th Jubilee Conference on "Shell Structures: Theory and Applications", SSTA 2013 - Gdansk, Poland
持續時間: 2013 十月 162013 十月 18

出版系列

名字Shell Structures: Theory and Applications - Proceedings of the 10th SSTA 2013 Conference
3

Other

Other10th Jubilee Conference on "Shell Structures: Theory and Applications", SSTA 2013
國家/地區Poland
城市Gdansk
期間13-10-1613-10-18

All Science Journal Classification (ASJC) codes

  • 土木與結構工程
  • 建築與營造
  • 建築

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