Dynamics simulation of ejection of metal under a shock wave

In this paper, the dynamic process of ejection from a metal surface groove under a shock wave is investigated by molecular dynamics simulation combined with a hybrid tight-binding-like potential. By taking 'snapshots' and analysing the pressure, we classify reflection rarefaction waves and second-uploading compression waves propagating in the material, and find one negative-pressure region and one high-pressure region induced by two wave series. The velocities of both the ejected atom and the free surface of the groove increase with the angle of the groove. When the half-angle of the groove is more than 60 deg., there is no ejected body, and this result is consistent with experiment