Molecular-Dynamic Investigation of Buckling of Double-Walled Carbon Nanotubes under Uniaxial Compression(Condensed matter: structure and mechanical and thermal properties)

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概要

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• This paper studies the buckling phenomena and mechanical behavior of single-walled carbon nanotubes (SWNTs) and double-walled carbon nanotubes (DWNTs) via molecular dynamics simulations. The Tersoff interatomic C-C potential is adopted. Using a dimensionless parameter, slenderness ratio (S_R, the ratio of length to diameter), we investigate the mechanical behavior of long and short nanotubes under compression through their buckling modes, total strain energy and strain energy density, as well as post-buckling. The curvatures of strain energy provide a means to measure the Young's modulus of the nanotubes. Moreover, jumps in either the strain energy or strain energy density indicate identical mechanical buckling strains, and are studied in relation to buckling modes. In our simulations, a transition time is observed for short nanotubes to reach stable vase-like buckling mode, indicating a time-dependent property of nanotubes. Furthermore, nanotubes with small S_R can bear higher compressive load after their first buckling. In addition, nanotubes with same chirality exhibit roughly the same elastic modulus, regardless of their lengths, when applied compressive strains are less than 5% strain. However, long nanotubes show smaller buckling strength. Effects of temperature at 300K on buckling strength for SWNT are also discussed in connection to our present study at 1K.

• 社団法人日本物理学会の論文
• 2008-04-15

著者

• HWANG Chi-Chuan

  Department of Engineering Science, National Cheng Kung University

• CHANG Jee-Gong

  National Center for High-performance Computing

• SU Ming-Horng

  Department of Mechanical Engineering, Wu Feng Institute of Technology

• Su Ming-horng

  Department Of Fire Science Wufeng Institute Of Technology

• Su Ming-horng

  Deparment Of Mechanical Engineering Wu Feng Institute Of Techology And Engineering

• Su Ming-horng

  Department Of Mechanical Engineering Wu Feng Institute Of Technology

• Hwang Chi-chuan

  Department Of Engineering Science National Cheng Kung University

• Chang Jee-gong

  National Center For High-performance Computing National Applied Research Laboratories

• Hwang C‐c

  National Cheng Kung Univ. Tainan Twn

• Wang Yun-che

  Engineering Materials Program Department Of Civil Engineering National Cheng Kung University

• Lu Jian-ming

  Department Of Engineering Science National Cheng Kung University:national Center For High-performanc

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