柱形破片冲击带壳装药起爆判据研究

为得到柱形破片撞击带壳装药的临界起爆判据，在一维脉冲冲击起爆判据及长杆判据的基础上，构建一种破片撞击起爆带薄壳炸药的等效模型。将破片撞击带壳装药的过程等效为破片撞击裸装药，导出包含破片长度、直径以及炸药壳体厚度等参量的临界起爆判据，并利用仿真软件对所得结论进行模拟验证。仿真结果表明：当壳体厚度较薄时，冲击波冲击起爆是炸药发生爆轰的主控机制，数值模拟与理论计算结果基本一致，该起爆判据适用，且破片长径比存在临界值，当破片长径大于该临界值时，破片长径比的变化对临界起爆速度影响很小。

Research on the Critical Energy Criterion of Covered Explosive by Cylindrical Fragment Impacting

In order to investigate the critical energy criterion of covered explosive detonated by cylindrical fragment impacting, a new equivalent model was made based on the rod criterion and one-dimensional initiation criterion. The initiation progress of covered explosive impacting by fragment is dealt as an equivalent to the progress of bared explosive by the method of theoretical calculation. Critical energy criterion contained with the length, diameter of the fragment and the thickness of the shell was deduced. Numerical simulation was done by software to validate the correctness of the conclusion. The results show that: the shock wave initiation is the main mechanism of explosive detonation while the explosive covered with thin shell, and the results of numerical simulation and theoretical calculation are basically the same, the critical energy criterion is applicable to the explosive covered with thin shell detonated by cylindrical fragment. And the L/D ratio has little effect on the critical detonation velocity while the L/D ratio is greater than the critical value.