A Study On Mechanics Properties Of Carbon Nanotubes Based On Molecular Structural Mechanics

First of all,Carbon nanotubes(CNTs)were discovered in 1991.This kind of new nano-materials has unique and excellent physical,chemical and mechanical properties,mainly due to the unique molecular structure of CNTs.They have a great theoretical significance to be developed for a great of applications.Secondly,it is difficult to study carbon nanotubes by experimental methods at present,and numerical simulation method has its own unique advantages,which can make up for the shortcomings of the experiment.This paper will analyze single-walled carbon nanotubes(SWNTs)in theory and simulation,calculate the Poisson's ratio,Young's modulus and other mechanical parameters,and discuss the influence of carbon nanotube diameter and temperature on these parameters.Then,the expressions of the elastic modulus and Poisson's ratio of SWNTs are derived by molecular structure mechanics,and compared with the existing results,the influence of diameter on the elastic modulus is obtained.Then,on the basis of analyzing the spatial structure of single-walled carbon nanotubes,the finite element ANSYS design language APDL is used to write the command program to carry out modeling.Finally,the shear modulus of single-walled carbon nanotubes is calculated,and the relationship between temperature and elastic modulus is obtained,that is,the temperature decreases with the increase of temperature,but the influence of temperature is not significant.The nonlinear analysis of single-walled carbon nanotubes(SWCNTs)is carried out,and its vibration modes are analyzed.