2，4-二硝基苯甲醚基熔铸含铝炸药冲击起爆特性

为钝感高能炸药安全性设计和应用提供理论依据和物理基础，深入开展钝感熔铸含铝炸药冲击起爆特性实验研究。建立蓝宝石飞片平面撞击加载炸药一维拉格朗日分析组合式电磁粒子速度计实验测试系统，测量2，4-二硝基苯甲醚（DNAN）基熔铸含铝炸药冲击起爆爆轰成长过程中不同拉格朗日位置的粒子速度-时间变化曲线，获得飞片撞击速度和固相炸药颗粒度等变化对其冲击起爆爆轰成长的影响规律，并确定了该熔铸含铝炸药的冲击Hugoniot关系（D=2.439+2.137u，D为冲击波传播速度，u为粒子速度）和未反应炸药状态方程参数。结果表明：DNAN基熔铸含铝炸药冲击起爆爆轰成长过程的典型粒子速度曲线呈驼峰状，冲击波阵面波后粒子速度明显上升并加速追赶前导波阵面，冲击起爆过程整体表现为加速反应特征；在该装药颗粒度级配范围和加载压力下，加载压力越高或固相炸药颗粒度越小，炸药冲击起爆爆轰成长越快，越早转为爆轰。

Shock Initiation Characteristics of DNAN-based Aluminized Melt-cast Explosive

To investigate the effect of explosive particle size on the shock initiation characteristics of insensitive aluminized melt-cast explosives，a one-dimensional Lagrange measuring system with the multiple electromagnetic particle velocity gauge is established for sapphire flyer impact initiation. The particle velocity profiles for the shock initiation and detonation growth processes of an DNAN-based aluminized melt-cast explosive are obtained with different impact velocities. The effects of flyer impact velocity and explosive particle size on the shock initiation and detonation growth are analyzed，and both the shock Hugoniot relation and the parameters of equation of state for unreacted explosive are determined for the aluminized melt-cast explosive. The measured particle velocity profiles are typically in a shape of hump，and the post-shock particle velocity increases obviously and goes after the leading wavefront. The shock initiation process is characterized by accelerated reaction. The post-shock particle velocity increases more rapidly and the shock initiation grows faster in the case of higher loading pressure and smaller particle size. It indicates that the mesoscopic structure greatly affects the shock initiation and detonation growth of aluminized melt-cast explosives.