Combined Torsional Buckling of Carbon Nanotubes Subjected to Thermo-Electro-Mechanical Loadings with Consideration of Scale Effect

2013 ◽  
Vol 562-565 ◽  
pp. 744-749 ◽  
Author(s):  
Xiao Hu Yao ◽  
Yu Gang Sun ◽  
Han Zhou Li

The present study has theoretically investigated the combined torsional buckling behavior of carbon nanotubes (CNTs) with consideration of scale effect in the multi-field coupling condition. The generalized governing equation of buckling for CNTs subjected to thermo-electro-mechanical loadings has been established based on an elastic shell model of continuum mechanics, in which scale effect is taken account of through the nonlocal elasticity theory. Except the applied torque and torsion-related axial load, the Van der Waals forces between adjacent nanotubes, as well as effects of temperature change and voltage load, is taken into consideration at the meantime. Numerical experiments are conducted to demonstrate the influences of different factors. The conclusions provided herein will be helpful and valuable for the dependent designs and related applications of CNT-based nano-structures serving in the complex thermal and electrical environment.

2013 ◽  
Vol 21 (8) ◽  
pp. 2031-2037
Author(s):  
姚小虎 YAO Xiao-hu ◽  
陈达 CHEN Da ◽  
孙玉刚 SUN Yu-gang ◽  
欧智成 OU Zhi-cheng ◽  
李函洲 LI Han-zhou

2006 ◽  
Vol 06 (02) ◽  
pp. 285-296 ◽  
Author(s):  
Q. WANG

A non-local elastic shell model is proposed for the first time in this study for considering the small-scale effect in axi-symmetric wave propagation in carbon nanotubes (CNTs). Two coupled radial and longitudinal modes, and one decoupled torsional mode, are derived from the developed non-local shell model. The small-scale effect on wave propagation is numerically studied and discussed. In addition, the cut-off frequency based on the non-local shell model is obtained, which is found to be free of the small-scale effect. It is interesting to note that only one asymptotic phase velocity exists in the CNTs using the non-local shell model, whereas two asymptotic phase velocities can be predicted using the classical or local elastic shell model. It is hoped the research presented herein can be used as a benchmark for future studies on the wave propagation of CNTs with non-local continuum models.


Chemosphere ◽  
2021 ◽  
Vol 271 ◽  
pp. 129775
Author(s):  
Raffaele Piscopo ◽  
Francesca Coppola ◽  
Ângela Almeida ◽  
Lucia De Marchi ◽  
Tania Russo ◽  
...  

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