The Simulation On Mechanical Property Of Carbon Nanotube Torsional Deformation And Thermal Stability Of Oscillatingtube

Carbon nanotubes (CNTs) are very small tube-shaped structures having the composition of a graphite sheet rolled into a tube, that are difficult or impossible using traditional experimental techniques directly measure the thermodynamic properties. In this paper, we have investigated the torsional mechanical properties of carbon nanotubes encapsulating silicon nanowire (SiNW@CNT). We have also studied the effect of different temperatures, the size of the cluster, and the length of carbon nanotubes on the oscillation frequency of oscillator which consist of carbon nanotube and platinum clusters.Molecular dynamics combined with continuum mechanics is utilized to predict the torsional mechanical properties of SiNW@CNT. The torsional behaviors of the kind of composites are studied. Radial distribution function are shown to predict the trend of structure of silicon nanowires, the strain energy curves are shown to predict of the interaction between atoms. This model can be used effectively to determine the mechanical properties such as the shear modulus of the carbon nanotubes. The results show that the shear modulus of composite system are gradual decrease with the turning degree deeply. The torsional behaviors of the perfect and defective carbon nanotubes has been attempted. According to the comparison with the perfect and defective CNTs, some excellent properties of SiNW@CNT are revealed.By using molecular dynamics, we have simulated the temperature influence on the vibration frequency of oscilator composed of Pt clusters and (8,8) CNT. We find that as the temperature increasing, the vibration frequency of oscillating tube becomes steady from the increasing state when the temperature is below 400 K, It is able to keep stability when the temperature is between 400~800 K, but when the temperature in higher than 800 K, the vibration frequency will increase and fluctuate a lot. The structure of oscilator and the oscillator length of CNT have a large impact on the vibration frequency of oscilator. When the size of Pt clusters exceeds a certain range, there would be wide fluctuations in the oscillation frequency of oscilator.