Effect of thickness on mechanical properties of hollow copper nano-cylinder by molecular dynamics

In this paper, hollow copper nano-cylinders are designed, and the influence of thickness on the mechanical properties of nano-cylinders is analyzed by molecular dynamics methods. In order to describe the circumferential deformation, the radial nature strain and the strain ratio to the principal nature strain are defined. Afterwards, the mechanical characteristics of the nano-cylinders with different thicknesses are given in terms of energy, stress, strain and deformation. It is found that the properties of the hollow nano-cylinders have an important relationship with the wall thickness. If the thickness of the nano-tube wall is not enough, the model has the large deformation during the relaxation process, and it loses the features of the original model section. After loading, the model will still deform like a cylinder's tension until it breaks. Although the deformations are similar, the gap between the stresses is extremely large. The corresponding relationship between the average stress and Mises stress of the nano cylinders is fitted, which provides reference for the subsequent study. (paper)