Study on the temporal-spatial evolution process of axial preformed fragment power field

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Abstract The temporal-spatial evolution process of fragment power field is the basis for calculating the state of fragment-target encounter and damage assessment. In order to accurately describe the temporal-spatial evolution process of the fragment power field of the axial preformed fragment warhead, the numerical simulation method is used to analyse the fragment dispersion characteristics of different warheads, and the fragment velocity attenuation model is established by programming. The numerical simulation results are used as the initial value to substitute into the model to obtain the temporal-spatial evolution process and the hitting target process of the fragment power field. The results show that the multi-layer fragments will collide many times under the action of detonation load, and the collision will lead to the decrease of the average velocity of the same fragment layer and the increase of the scattering angle. After increasing the number of fragments, the outer fragments are more concentrated, but the average velocity is significantly reduced, and the fragment miss rate increases. This study can provide a calculation basis for the state of fragment-target encounter and the static and dynamic explosion test of fragment warhead.