冲击起爆弹丸内装药延迟起爆数值模拟

对穿爆燃弹的穿靶及释能过程进行数值模拟，解释了SPH-FEM耦合方法在模拟冲击起爆过程的优越性。通过对不同弹芯头部形状、直径及材料的对比分析，得到了不同工况下装药热点成长的压力-时间曲线，计算结果表明:在弹芯直径不变的情况下，弹芯头部直角尖刺越短，装药的热点成长时间越短；在头部尖刺长度不变的情况下，减小弹芯直径，热点生成时间也缩短；选用钢弹芯比钨合金弹芯有一定靶后释能优势。模拟穿靶效果与真实穿靶效果符合较好，这种方法可以为穿爆类弹丸设计提供依据。

Numerical simulation of the delay time of impact initiated projectile

In this work, we investigated the process of penetration and energy release of the impact initiated projectile was investigated using numerical simulation, verified the superiority of the coupling of smooth particle hydrodynamics (SPH) with finite element method (FEM) in impact initiation, and obtained pressure-time curves for the projectile's hot-point pressure growth in different operating conditions by analyzing its bullet core's different head shapes, diameters and materials. Our simulation results show that, for a given bullet core's diameter, the shorter the bullet head's spike length, the more reduced the initiation time for the explosives' hot-point growth; for a given bullet core's length, a reduced bullet core's diameter will lead to a reduced hot-point growth time; and bullet cores made from steel show greater advantage at delay initiation time over those made from tungsten alloy. The simulated effects of target penetration are fairly consistent with those from experimental results.