BUCKLING OF DEFECTIVE CARBON NANOTUBES UNDER AXIAL AND TRANSVERSE LOADS

2014 ◽  
Vol 06 (01) ◽  
pp. 1450004 ◽  
Author(s):  
S. ZIAEE
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Vacancy Defect ◽  
Vacancy Defects ◽  
Single Walled Carbon ◽  
Transverse Loads ◽  
Buckling Behavior ◽  
Critical Buckling Force ◽  
Loading Ratio ◽  
Walled Carbon Nanotubes

Elastic buckling of single walled carbon nanotubes (SWCNTs) with di-, triple- and pinhole vacancy defects under the transverse and axial compression loading is investigated based on molecular structural mechanics. In this research, the effects of length, radius, loading ratio, and the position of vacancy defect on the buckling behavior of armchair and zigzag single-walled carbon nanotubes are studied. It is found that the position of pinhole-vacancy has a significant effect on the percent of the reduction of the critical buckling force. It is also seen, that the effect of loading kind on the critical buckling forces loses its importance if the length of carbon nanotube (CNT) increases.

The Effects of Different Defects on Buckling Behavior of Single-Walled Carbon Nanotubes

2010 ◽  
Vol 97-101 ◽  
pp. 3749-3752
Author(s):  
Li Jie Chen ◽  
Qi Zhao ◽  
Zun Qun Gong
Keyword(s):  
Carbon Nanotubes ◽  
Axial Compression ◽  
Three Dimensional ◽  
Single Walled Carbon Nanotubes ◽  
Diameter Ratio ◽  
Vacancy Defects ◽  
Compression Load ◽  
Single Walled Carbon ◽  
Buckling Behavior ◽  
Walled Carbon Nanotubes

In this paper, based on the continuum mechanics method, we adopt the three-dimensional finite element (FE) models to study the effects of different defects on buckling behavior of armchair and zigzag single-walled carbon nanotubes (SWCNTs) under axial compression. The variations of the buckling modes and the critical buckling strains with the diameter and the length-diameter ratio of SWCNTs are investigated. The diameters of SWCNTs vary from about 0.2 to 2 nm, and the length-diameter ratios vary from 3 to 30. Two kinds of atom vacancy defects are considered. The calculation results show that the length and the diameter of SWCNTs are relatively significant factors affecting the buckling behavior of SWCNTs. There is an optimal diameter with which the SWCNTs can bear much higher axial compression load than those with other diameters. The defects affect the buckling behavior of SWCNTs obviously when the length-diameter ratio of the nanotube is about less than 8 and the defects studied in this paper can decrease the critical buckling strain by a largest proportion of 41.5%.

ON INSTABILITY OF SINGLE-WALLED CARBON NANOTUBES WITH A VACANCY DEFECT

2008 ◽  
Vol 08 (02) ◽  
pp. 357-366 ◽  
Author(s):  
Q. WANG ◽  
V. K. VARADAN ◽  
Y. XIANG ◽  
Q. K. HAN ◽  
B. C. WEN
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Continuum Mechanics ◽  
Elastic Beam ◽  
Single Walled Carbon Nanotubes ◽  
Vacancy Defect ◽  
Technical Note ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
The Continuum

This technical note is concerned with the buckling of single-walled carbon nanotubes with one atomic vacancy. An elastic beam theory is developed to predict the buckling strain of defective CNTs, and the strain prediction via the continuum mechanics model is verified from comparison studies by molecular dynamics simulations. The results demonstrate the effectiveness of the continuum mechanics theory for longer CNTs. In addition, a local kink is revealed in the morphology of the buckling of shorter defective CNTs via molecular dynamics.

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