Multi-Scale Simulations of Dynamic Behaviors of Nano-Crack in Shocked Material

The multi-scale numerical simulation method was used to simulate the dynamic behaviors of crack in metal Al under tensile loading. This technique involves the molecular dynamics method used in local defect domain and finite element method used in whole field of model. A bridge-scale function is used to combine the methods of two above. Based on the data analysis of the calculated strain field, stress field and atom position, it is revealed that dislocations are emitted from the tip of crack, and the stress converged on crack accelerates the propagation of crack,which results in the macro failure of material finally.