Molecular Dynamics Study on Wavefront Structure of Single Crystal Copper under Femtosecond Laser Loading

We used computer simulation with the advantage of easily designing the material structure to design single crystal copper samples,studied the mechanical behaviors of this material under different shock compression conditions,and comparatively analyzed the reasons for the formation of different mechanical behaviors.An important macro performance of metal mechanical behaviors under shock compression is the shock wave front.In fact,the structure and the evolution of the shock wave front during the plastic phase are determined by its microscopic process,i.e.,the development process of shear flow and energy dissipation in the plastic phase.Due to the limitation of the resolution of experimental instruments,it is not yet possible to obtain a clear shock wave front structure through experiments.By means of molecular dynamics(MD)simulation,we obtain the velocity and coordinate information of every atom in each system,then compare the plastic deformation behavior of the material under different impact conditions,and finally obtain the impact of the shock conditions on the structure of the shock wave front.