穿爆弹丸内装药撞击起爆实验及数值模拟

为了研究穿爆弹丸内装药的起爆机理,对穿爆弹丸的惯性点火元件进行设计,进行了弹道发射撞击起爆试验。对炸药采用SPH建模,对其他结构采用有限元网格划分,建立了穿靶过程数值模型。根据含能材料在撞击作用下的非冲击起爆判据,采用ANSYS/LS-DYNA软件对装药的惯性撞击特性进行分析,得到了钝化RDX装药的临界起爆能量范围。结果显示:弹丸以394 m/s的速度撞击7.4 mm的靶板时发生爆炸,装药起爆的临界比塑性能在1.42 GPa·μs～1.63 GPa·μs范围内; 在弹丸能够有效穿透靶板的情况下,弹丸的着靶速度越低,装药所受惯性冲击力越小,惯性作用持续时间越长,装药越容易被起爆。

Impact Initiation Experiment and Numerical Simulation ofCharge of Armor-piercing Explosive Projectile

To study the initiation mechanism of armor-piercing explosive projectile(APEP),the structure of ignition element was redesigned,and the inertial impact initiation tests were carried out. The explosive was modelled by smoothed particle hydrodynamics(SPH),and the finite element mesh division was carried out for other structures,and the numerical model of APEP in the process of piercing target was built. According to the criterion of non-shock initiation of energetic materials,the inertial impact characteristics were analyzed by ANSYS/LS-DYNA,and the critical initiation conditions of the charge were obtained. The results show that,the passivated RDX explodes while the projectile impacting the 7.4 mm steel target with a speed of 394 m/s,and the critical initiation specific plastic energy of the charge is within the range of 1.42 GPa·μs to 1.63 GPa·μs. In the situation that the projectile can penetrate the target effectively,the lower the impact velocity of the projectile,the smaller the inertial impact force on the charge and the longer the inertial action duration,the easier the charge can be detonated.