准等熵加载下PBXC03炸药起爆响应特性实验研究

为了探寻在准等熵加载下炸药的起爆响应特性和爆轰成长规律问题，利用磁驱动加载设备CQ-4装置和多路光子多普勒测速技术PDV，建立了炸药1维准等熵加载起爆响应试验测试系统.在1次准等熵加载下获得5个不同厚度的高聚物粘结炸药PBXC03响应背面粒子速度时间历史，得到炸药准等熵加载起爆爆轰成长特性.实验结果表明，获取的各个厚度炸药样品背面的粒子速度波形干净，细节清楚.准等熵加载进入炸药后，在传播的过程中首先由于波的追赶作用而形成前导冲击波.而且，准等熵加载下起爆机制与冲击起爆机制存在明显的差异，准等熵加载在较强冲击波形成前，热点形成较少，炸药几乎不发生反应；形成较强冲击波后，炸药响应表现为由热点机制主导的冲击起爆爆轰成长特性. 

Experimental Research of Characteristics of Initiation Response of PBXC03 Under Quasi-Isentropic Loading

In order to explore the characteristics of explosive''s initiation and the detonation growth in the explosive under quasi-isentropic loadings, a one-dimensional initiation response test system under quasi-isentropic loadings was established by the magnetic compression device CQ-4 and the multichannel photonic Doppler velocimetry (PDV). Surfaces of five PBXC03 samples with different thicknesses were compressed by the quasi-isentropic loading so as to obtain particle velocities of sample''s reverse sides. Results show that the waveforms of particle velocities obtained are clean and details of them are clear. After the quasi-isentropic loading enters into the explosive, a precursor shock wave is formed by the chasing and convergence of quasi-isentropic waves. And, initiation mechanisms of the explosive under quasi-isentropic loadings have obvious differences from that under impact shock loadings. Before the formation of the strong precursor shock wave, few hot-spots are formed and no reaction occurs in the explosive. Otherwise, the response of the explosive performs as characters of initiation and detonation dominated by the hot-spot initiation mechanism after the strong shock wave is formed.