Numerical analysis of the detonation characteristicsof cased charges under mass impact
In order to explore the mechanism of the new anti-missile protection structure,nonlinear dynamics software LS-DYNA was used to establish a large typical projectile on the cylindrical shell charge structure of the impact detonation numerical analysis model.Tungsten alloy projectile of different masses,shapes and tilt angles under the low-velocity impacting the shell B charge were calculated to obtain the critical impact velocity,the process of the detonation and the pressure change.The results show that:the larger the mass of the projectile,the wider the surface of the transmitted pressure wave formed inside the charge,and the longer the duration;In the 0.1～30 kg mass range,the projectile impact detonation of shelled charge performance is related to the initial kinetic energy.The critical kinetic energy of B charge with 20 mm,40 mm and 60 mm end caps under impact initiation is about 250 kJ,930 kJ and 1 600 kJ respectively;Projectile tilt impact charge detonation orientation with the change in tilt angle φ.As φ≤15°,the lowest critical impact velocity is by cylindrical projectile;As φ>15°,the lowest critical impact is by velocity spherical projectile.
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