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单壁碳纳米管的力学行为是纳米复合材料和纳米器械的基本问题之一.使用有限元方法系统地研究了单壁碳纳米管的轴压和纯弯变形,并将有限元模拟结果和分子动力学模拟结果进行了比较.研究结果表明单壁碳纳米管的轴压屈曲载荷受直径变化的影响;单壁碳纳米管在弯曲载荷作用下的屈曲和后屈曲行为强烈地依赖于管长和管径的变化,合理地选择碳纳米管的弹性模量和壁厚,有限元方法能够很好地解释碳纳米管的屈曲机理.研究大尺度的纳米力学问题时,有限元方法将会成为更加准确、快捷的数值模拟方法.
The mechanical behavior of single-walled carbon nanotubes is one of the basic problems of nanocomposites and nano-devices.The axial compressive deformation and pure bending deformation of single-walled carbon nanotubes are investigated systematically using finite element method, and the finite element simulation results and molecular The results show that the buckling load of single-walled carbon nanotubes is affected by the change of diameter. The buckling and post-buckling of single-walled carbon nanotubes under flexural load are strongly dependent on the tube length and The change of diameter and the reasonable choice of the elastic modulus and the wall thickness of the carbon nanotube, the finite element method can well explain the buckling mechanism of the carbon nanotube.When studying the nanomechanics problems of large scale, the finite element method will become more Accurate and fast numerical simulation method.