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碳纳米管的优异力学特性使其在冲击能量吸收方面存在潜在的应用前景,但纳米尺度的冲击验证实验却难以实现.应用分子结构力学、冲击动力学和纳米尺度有限元相结合的方法,研究了单壁碳纳米管受轴向冲击的吸能特性.使用ANSYS中APDL编程语言,建立了单壁碳纳米管的空间结构参数化模型;同时,采用修正的Morse原子势函数拟合了C-C共价键的本构方程.按照最大失效应变作为共价键断裂的判据,对比了长度、直径和手性对单壁碳纳米管冲击吸能的影响.结果表明:采用这种仿真方法可以动态呈现碳纳米管断裂的全过程,且能够证实单壁碳纳米管的比吸能远高于其他材质类似管状结构,其中,锯齿型碳纳米管的吸能特性又好于扶手椅型.
The excellent mechanical properties of carbon nanotubes make them potential applications in the impact energy absorption, but the nanoscale impact test is difficult to achieve.Using molecular mechanics, impact kinetics and nanoscale finite element method to study The energy absorption characteristics of single-walled carbon nanotubes (MWNTs) subjected to axial impact were studied.The spatial structure parameterization model of single-walled carbon nanotubes was established by using APDL programming language in ANSYS.At the same time, a modified Morse atomic potential function The constitutive equation of the valence bond is deduced according to the maximum failure strain as a criterion for the covalent bond fracture. The effects of length, diameter and chirality on the impact energy absorption of single-walled carbon nanotubes are compared. The results show that this simulation method can dynamically Showing the whole process of breaking of carbon nanotubes, and it can be confirmed that the specific energy absorption of single-walled carbon nanotubes is much higher than that of other materials. The energy-absorbing property of the zigzag-shaped carbon nanotubes is better than the armchair type.