Investigation of the Dynamic Buckling in the Carbon Nanotube under Impact Torque |
| Journal |
Key Engineering Materials (Volumes 340 - 341) |
| Volume |
Engineering Plasticity and Its Applications |
| Edited by |
N. Ohno and T. Uehara |
| Pages |
65-70 |
| DOI |
10.4028/www.scientific.net/KEM.340-341.65 |
| Online since |
June, 2007 |
| Authors |
Feng Huan Sha,
Long Mao Zhao,
Gui Tong Yang
|
| Keywords |
Bifurcation, Carbon Nanotube (CNT), Dynamic Buckling, Impact Torque, Torsion Stress Wave |
| Abstract |
The dynamic buckling caused by propagation of a stress wave in single-wall carbon
nanotube subjected to impact torque is investigated. The single-wall carbon nanotube is modeled by a
cylindrical shell with semi-infinite length, and the dynamic buckling under impact torque is reduced
to a bifurcation problem caused by the propagation of torsion stress wave. The bifurcation problem
can be converted to solving a group of nonlinear algebraic equations. The numerical computation is
carried out, and the effects of the different parameters on dynamic buckling are discussed. It is found
that if critical buckling time of the carbon nanotube is different, the corresponding buckling model is
different, too. Relation between the critical buckling stress and the critical buckling time is given.
Molecular-dynamic simulations of torsional deformation of a single-wall carbon nanotube have been
used to obtain the critical buckling strain, which is 0.064. In this work, the critical buckling strain
obtained by the continuum model is 0.061, which is very close to the value 0.064. Single-wall carbon
nanotubes have very much powerful anti-impact torque, and the critical buckling shearing stress can
reach up to 132GPa. |
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