Distribution Law of Pressure on Liner Surface under Multi-Point Initiation

In order to investigate the distribution law of pressure on the liner surface and the effect of initiation point parameter on the pressure distribution, the interaction of detonation waves with each other and with the liner is simulated by LS-DYNA software. The simulation results coincide well with the experimental data. The results of the study indicate that detonation waves collide with each other on the symmetry plane of the initiation points, and the pressure of collision position increases, which make the pressure distribution of liner uneven. While the distance between initiation points is bigger, the pressure of tip liner increases quickly, but the pressure of edge region of liner decreases gradually. When the distance is 50 mm, the pressure drops suddenly, namely the distance has a maximum value. The pressure of liner increases with the number of initiation point, but the increase rate reduces gradually, and the pressure distribution laws on the liner surface with different initiation numbers are similar. The conclusions can supply a theoretical basis for choosing appropriate initiation point parameters of the explosively formed projectile with star shaped tail.