Coupling Action Spans for Air-Blast Waves and Fragments by Fragmentation Warheads Exploding in Air

In the present work, to find out the mechanisms of the coupling effect for blast waves and fragments by fragmentation warheads exploding in the air, we developed a theoretical model by analyzing the motion patterns of the blast waves and fragments moving in the air in consideration of the influence of the shell on the intensity of the shock wave.Meanwhile, we carried out an analysis of an actual case and examined the factors that influence the coupling action spans.The results show that the warhead loading coefficients, detonation velocities, shell thicknesses and energy allocations have a great influence on the coupling action spans, whereas the influence of the explosion heats, masses and shapes of the fragments is relatively limited.The coupling action spans decrease with the increase of the loading coefficients, explosion heats and detonation velocities of the explosives, fragment masses and the energy ratio of the shock wave energy to the fragment kinetic energy.However, as the shell thickness gets bigger and the fragment shapes become more abnormal, the coupling action spans become larger.