PBX-C10炸药磁驱动准等熵压缩动态响应特性

Dynamic Response Characteristics of PBX-C10 under Magnetically Drived Quasi-isentropic Compression

为分析奥克托今基高聚物粘结炸药(PBX)在经历准等熵高压加载时炸药动态响应特性,开展了PBX爆轰实验研究。采用磁驱动准等熵压缩加载设备CQ-4装置和多路光子多普勒测速技术,建立一维准等熵加载起爆响应实验测试系统,研究炸药在加载压力12.7~17.2 GPa下的爆轰成长规律。结果表明:准等熵加载下起爆机制与冲击起爆机制存在明显差异,准等熵加载在较强冲击波形成之前热点形成少,炸药基本不发生化学反应;形成较强冲击波后,炸药响应表现为热点机制主导的冲击起爆爆轰成长特性;对不同装药密度的PBX-C10炸药在准等熵加载下的起爆响应进行比较,发现同等压力下较低密度的炸药样品起爆成长更快,但实验表现并不明显,需要进一步计算分析。

The detonation test of PBX-C10 was made to explore its dynamic response characteristics under quasi-isentropic loading.An one-dimensional initiation response test system was established by the magnetic compression device CQ-4 and the multiplexed photonic Doppler velocimetry.The detonation growth rule of explosive at 12.7-17.2 GPa was studied.Results show that the waveforms of particle velocities obtained are clean,and their details 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 the initiation mechanism of explosive under quasi-isentropic loading has obvious difference from that under shock loading.Before the formation of the strong precursor shockwave,few hot-spots are formed and no reaction occurs in the explosive.Otherwise,the response of the explosive performs as the characters of initiation and detonation dominated by the hotspot initiation mechanism after the strong shock wave is formed.The explosives which have lower densities will be more aggressive than those which have higher densities.