Numerical simulation on elastic-plastic response of high speed liquid-solid impact

The impact of a spherical water droplet of 0. 4 mm in diameter and 500 m/s in speed with planar elastic-plastic steel was simulated by using the coupling of Lagrange and Euler methods. The dynamic response of liquid-solid impact was obtained and investigated to provide some references to the liquid erosion. It is shown that the plastic property of the solid has a considerable effect on the impact process. The plastic solid material exhibits less resistance to the impacting droplet than the elastic one. Before the shock wave departure, the high pressure region moves to the contact edge during the impact, meanwhile, the pressure increases. The maximum calculated pressure at the contact edge is 3.7 times of the water-hammer pressure. After the shock wave departure, lateral jetting comes into existence, but its time is later than the time of the shock wave departure a little. The velocity of the lateral jet is very high and about five times of the impact velocity. On the other side, the solid undergoes plastic deformation continuously because of the intense shearing effect of the lateral jet. The final deformation calculated is in good agreement with the experimental result, and the high stress in solid lasts for considerably long time.