Numerical simulation of shaped charge jet formation under different ways of initiation

LS-DYNA finite element code is used to simulate the formation processes of shaped charge jet under point initiation, plane initiation, direct and inverse annular initiation. Calculated results such as jet tip velocity and diameter are obtained. The results are in good agreement with experimental data, which proves that the model established in the paper is reliable. By analyzing the results, it suggests that ways of initiation have great influence on jet performance. Different ways of initiation produce different shapes of detonation wave, and the jet performances prove to be better when the wave shape better matches the outside shape of the liner. Hence, jet tip velocity produced by direct annular initiation is higher than that of plane initiation, and plane initiation higher than point initiation. It is also concluded that the jet tip velocity of plane and annular initiation increases as the initiation radius increases.