Flow field analysis of long rod hypervelocity penetration into semi-infinite concrete target

An ovoid of Rankine was used to describe the flow field shape, and a flow field analysis model was constructed to depict the penetration process. The depth of penetration, tunnel radius, change in the long rod length, and penetration velocity was calculated using this model. The calculation results were in good agreement with experimental data from previous studies. The influence of long rod material parameters on penetration was also analyzed. The following results were obtained: the depth of penetration increased slowly with increasing impact velocity at hypervelocity penetration, the erosion rate of the long rod was constant during the penetration process, and the length of the long rod was the most sensitive parameter affecting the depth of penetration, and the hole radius and long rod diameter had an approximately linear relationship and both increased with rod density.