Single Crystal Copper Mechanical Performance Study By Molecular Dynamic Simulation

With the rapid development of the information and materials engineering,the new generation of electronic devices have been developed,and the Micro/Nano motor system is the most representative.The single crystal copper's mechanical properties under different loading ways can determine the service life of the new electronic devices.Therefore,the Single crystal copper nanometer sheet under radial loading is simulated by molecular dynamics method,whose size is 20a?20a?5a.The Single crystal copper nanometer cube under triaxle tensile loading is simulated by molecular dynamics method,whose size is 20a?20a?20a.The Single crystal copper nanometer bar under shock compression loading is simulated by molecular dynamics method,whose size is 20a?20a?60a.In this paper,the loading rate?temperature and orientation are discussed when the Single crystal copper nanometer sheet under radial loading.We get that increasing loading rate and raising the temperature can make the mechanical properties of the Single crystal copper nanometer sheet become weaken.The mechanical properties ordern of Single crystal copper nanometer sheet with different orientations is:[111](29)[110](29)[100].Secondly,the void defect?loading rate?temperature and orientation are discussed when the Single crystal copper nanometer cube under triaxle tensile loading.We get that reducing the void size and specific surface area can improve the mechanical properties of the Single crystal copper nanometer cube.The loading rate can't change the nanometer's elasticity modulus,but can make the material reinforcement.Raising the temperature can make the mechanical properties of the Single crystal copper nanometer cube become weaken.The mechanical properties order of Single crystal copper nanometer cube with different orientations is:[111](29)[110](29)[100].Finally,the loading rate?orientation and hollow defect are discussed when the Single crystal copper nanometer bar under shock compression loading.We get that when increasing loading rate,the shock wave pressure and the shock wave speed of the Single crystal copper nanometer bar are becoming larger.Increasing the loading rate can improve the mechanical properties of the Single crystal copper nanomater bar.The shock wave pressures order of Single crystal copper nanometer bar with different orientations is: [100](29)[111](29)[110].Theshock wave speeds order of Single crystal copper nanometer bar with different orientations is: [110](29)[111](29)[100].The mechanical properties order of Single crystal copper nanometer bar with different orientations is: [100](29)[111](29)[110].The smaller the hollow defect,the bigger of the shock wave pressure is.Shock wave speed is almost not influenced by the hollow defect.Reducing the hollow defect size can improve the mechanical properties of the Single crystal copper nanomater bar.