Mechanics Performance Of Single Crystal Copper In Micro Region

The micro-scale simulation has become an important method in micro/nano research field, and the study based on the micro mechanical behavior and the micro mechanical parameters are the base for revealing the phenomena and principles in micro/nano regime.On the basis of the MFC environment of VC++6.0and molecular dynamics, a program used for studying the stretching and bending behavior of single crystal copper is developed. Based on the Lennard-Jones pair potential, three two-dimensional stretching models, regrading ideal copper (model1), having defect in the middle (model II) and at the edge of a copper (model III), are established and analyzed. Through analysis, due to the influences of defects, the stretching property of the model III is the worst followed by the model II during stretching process. Moreover, through the embedded atom potential, a three-dimensional molecular dynamics of bending behavior models, regarding ideal copper, having defect in the middle and at the edge of a copper cylinder, are established. Through analysis the mechanical properties respectively, the results indicate that the defects-will influence the bending properties of microscopic materials, and the defect on the right edge will enhance the flexibility of the whole model, while the defect in the middle will hinder the bending behavior.Based on the Lennard-Jones pair potential, a relationship between the parameters of the interatomic potential and that of the interfacial potential has been found, and the consistency between adhesion model of Bradley and adhesion model based on the Hamaker hypotheses is demonstrated. Furthermore, through the elaboration of the bulk modulus, we found that not only the results from different expressions of the bulk modulus are the same, but also the bulk modulus is equivalent to Young’s modulus as well.