Assessment of continuum mechanics models in predicting buckling strains of single-walled carbon nanotubes

Zhang, Y. Y., Wang, C. M., Duan, W. H., Xiang, Y. and Zong, Z. (2009) Assessment of continuum mechanics models in predicting buckling strains of single-walled carbon nanotubes. Nanotechnology, 20 39: . doi:10.1088/0957-4484/20/39/395707


Author Zhang, Y. Y.
Wang, C. M.
Duan, W. H.
Xiang, Y.
Zong, Z.
Title Assessment of continuum mechanics models in predicting buckling strains of single-walled carbon nanotubes
Journal name Nanotechnology   Check publisher's open access policy
ISSN 0957-4484
1361-6528
Publication date 2009-09-30
Sub-type Article (original research)
DOI 10.1088/0957-4484/20/39/395707
Open Access Status Not yet assessed
Volume 20
Issue 39
Total pages 8
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Language eng
Abstract This paper presents an assessment of continuum mechanics (beam and cylindrical shell) models in the prediction of critical buckling strains of axially loaded single-walled carbon nanotubes (SWCNTs). Molecular dynamics (MD) simulation results for SWCNTs with various aspect (length-to-diameter) ratios and diameters will be used as the reference solutions for this assessment exercise. From MD simulations, two distinct buckling modes are observed, i.e.the shell-type buckling mode, when the aspect ratios are small, and the beam-type mode, when the aspect ratios are large. For moderate aspect ratios, the SWCNTs buckle in a mixed beam-shell mode. Therefore one chooses either the beam or the shell model depending on the aspect ratio of the carbon nanotubes (CNTs). It will be shown herein that for SWCNTs with long aspect ratios, the local Euler beam results are comparable to MD simulation results carried out at room temperature. However, when the SWCNTs have moderate aspect ratios, it is necessary to use the more refined nonlocal beam theory or the Timoshenko beam model for a better prediction of the critical strain. For short SWCNTs with large diameters, the nonlocal shell model with the appropriate small length scale parameter can provide critical strains that are in good agreement with MD results. However, for short SWCNTs with small diameters, more work has to be done to refine the nonlocal cylindrical shell model for better prediction of critical strains.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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