Prediction of compressive post-buckling behavior of single-walled carbon nanotubes in thermal environments

2012 ◽  
Vol 113 (1) ◽  
pp. 145-153 ◽  
Author(s):  
R. Ansari ◽  
R. Gholami ◽  
S. Sahmani
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Thermal Environments ◽  
Buckling Behavior ◽  
Post Buckling ◽  
Walled Carbon Nanotubes

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%.

BUCKLING BEHAVIOR OF SHORT MULTI-WALLED CARBON NANOTUBES UNDER AXIAL COMPRESSION LOADS

2012 ◽  
Vol 12 (06) ◽  
pp. 1250045 ◽  
Author(s):  
A. H. KORAYEM ◽  
W. H. DUAN ◽  
X. L. ZHAO ◽  
C. M. WANG
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Mechanics ◽  
Axial Compression ◽  
Single Walled Carbon Nanotubes ◽  
Buckling Mode ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Buckling Behavior ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

We investigate the buckling behaviors of short multi-walled carbon nanotubes (MWCNTs) under axial compression by using molecular mechanics (MM) simulations. The effects of the number of walls, length and chiral angle of MWCNTs on the buckling behaviors are examined. The results show that the buckling behaviors of short MWCNTs are rather different from single walled carbon nanotubes (SWCNTs) and slender MWCNTs. Moreover, it is observed that the buckling strains of short MWCNTs vary inversely proportional to the number of nanotube walls. For slender MWCNTs, the buckling strains fluctuate as the number of walls increase. It increases for beam-like buckling mode, decreases for shell-like buckling mode and is approximately constant for the shell-beam-like buckling mode. The increase in the length of MWCNT has also led to a significant decrease of the buckling strain for short MWCNTs. However, chirality does not have a significant effect on the buckling strain of MWCNTs nor alter the buckling mode of short MWCNTs.

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.

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