Propagation of stress wave in nickel single crystals nanofilm via molecular dynamics

Stress wave propagation is examined in nickel single crystals nano-film using molecular dynamics. The x, y and z direction correspond to the crystallographic orientation [100], [011] and [0-11], respectively. Two kind of shear stress is loaded along x-axis, which is also loaded along z-axis. One is the 0.36 Gpa square pulse shear stress, which can be maintained 1 ps, and the other is the 0.36 Gpa constant shear stress. The simulation result shows that the stress transfer in the metal film is according to the way of wave, and there is time lag in the progress of stress wave propagation. The properties of wave reflected from fixed and free end are different. The stress reversal is a characteristic of the free end, and the stress multiplication phenomenon is a characteristic of the fixed end. The wave speed is different, as the stress wave propagates along the different lattice direction. This is consistent with the macroscopic conclusion.