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Buckling Behavior of Carbon Nanotubes under Simple and Combined Loading

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Tutor: LiGuoQing
School: Huazhong University of Science and Technology
Course: Solid Mechanics
Keywords: single-walled carbon nanotubes,double-walled carbon nanotubes,simple load,combin
CLC: TB383.1
Type: Master's thesis
Year:  2011
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The unique physical properties and many kinds of configurations of carbon element bave been gradually discovered, understood and used. The development of our society has been greatly accelerated by the application of graphite electrodes, the exploration of composites based on carbon fiber etc. Numerous experiments have shown special mechanical properties, such as high strength and high rigidity as well as electrical properties for carbon nanotubes (CNTs) since they were first reported. Nanotubes are considered to be the most promising materials of applications in nano-engineering and nano-materials, which requires a clear understanding of the mechanical properties and deformation mechanism of CNTs.In this paper, the molecular mechanics simulation and continuum mechanics method are used to investigate the buckling behavior of SWNTs and DWNTs. The paper deals with the deformation and buckling behavior of SWNTs and DWNTs under different types of loads. The simple loads considered are axial compression, axial tension and torsion, and the combined loads involve simultaneous actions of axial compression (or axial tension) and torsion. The molecular mechanics simulation is used to determine the variation of energies with strain. Simulations results also show the buckling behavior is strongly size dependent. Based on the comparison of molecular mechanics simulation results with the continuum mechanics results, we can prove the continuum mechanics method is reliable.For the buckling of SWNTs and DWNTs under simple loads, the results show that the buckling behavior is depended by the chiral, length, radius of the carbon nanotubes. For the buckling of DWNTs under torsion load, a new concept of equivalent thickness of DWNTs is introduced, and this simple model provides another new and effective mothod of modeling torsional buckling angles of DWNTs with fairly good accuracy.For the buckling of SWNTs and DWNTs under combined loads, the buckling behavior of DWNTs under different axial loads are determined. It is found that the buckling behavior of SWNTs and DWNTs subjected to combined loads is also size dependent. The interaction buckling curves are obtained for nanotubes under combined loading case of axial compression or tension and torsion. Besides, we also find that the interaction buckling curves are size dependent.The reseach of buckling behavior and deformation mechanics of CNTs in this paper is helpful to the design of nanotubes materials, and is meaningful for the development and application of CNTs.
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