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International Journal for Multiscale Computational Engineering
Fator do impacto: 1.016 FI de cinco anos: 1.194 SJR: 0.554 SNIP: 0.82 CiteScore™: 2

ISSN Imprimir: 1543-1649
ISSN On-line: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2012003185
pages 17-26

BUCKLING PROPERTIES OF PRE-STRESSED MULTI-WALLED CARBON NANOTUBES

Ming D. Ma
Center for Nano and Micro Mechanics, Tsinghua University
Luming Shen
School of Civil Engineering, University of Sydney
Lifeng Wang
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
Quanshui Zheng
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

RESUMO

Pre-stressed multi-walled carbon nanotube (PS-MWCNT), of which the interwall distance is less than 0.34 nm, holds for the highest Young's modulus while its interlayer shear strength is several orders higher than normal MWCNT. The buckling behaviors of PS-MWCNTs with two to six layers are studied using both molecular mechanics simulation and continuum mechanics models in this paper. Considering the interlayer distance as the key factor, we reveal three features of the buckling behavior of PS-MWCNTs subjected to axial loading: 1) the buckling membrane force is not a monotonic function of interlayer distance, depending on the nanotube index (i.e. diameter); 2) the buckling membrane force increases as the interlayer distance decreases for PS-MWCNTs with a fixed intertube chirality, which is a combined effect of interlayer distance and tube diameter; 3) for PS-MWCNTs with the same innermost tube, the buckling membrane force increases as the number of walls increases. Furthermore, molecular mechanics simulation and multi-shell continuum model show an agreement on the trend of the buckling membrane force as a function of interlayer distance, tube chirality index, and number of layers. These results can serve as a bridge between the molecular simulation and the continuum model for the buckling behaviors of PS-MWCNT.


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