Simulation study on the influence of groove depth on the lethal power performance of annular hollow pre controlled fragment warheads

The pre controlled fragment warhead can be applied in certain specific scenarios due to its excellent damage performance and structural integrity. It is widely used in different combat scenarios. In order to obtain the influence of different groove depths on the lethal power performance of warheads, this paper uses numerical simulation methods to establish a finite element model of an annular hollow pre controlled fragment warhead. It carries out numerical simulation calculations on the lethal power performance of the annular hollow pre controlled fragment warhead. The results show that the detonation wave propagation of the annular hollow pre controlled fragment warhead is affected by the cavity sparsity effect, resulting in a secondary pressure jump of 10⁹Pa. The pressure generated by the superposition of spherical waves in the strong direction is about 200% of that in the weak direction. Within a certain range, the axial initial velocity of the pre controlled fragments increases with the deepening of the groove depth. The average initial velocity in the strong direction increases by 22.96% compared to the weak direction. The influence of different groove depths on the circumferential initial velocity of pre controlled fragments near the detonation point is the greatest, followed by the middle part of the warhead, and the influence far from the detonation point is the smallest. The scattering angle of fragments increases first and then decreases with the increase of relative groove depth. When the relative groove depth is 0.5, the maximum scattering angle of the fragments is 14.6 °. It increases by 35.2%. This study can provide valuable references for the optimization design and damage assessment of related warheads.