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Numerical Research on Initiation of PBXC03 Explosives under Quasi-Isentropic Loadings

机译：准二等级载荷下PBXC03爆炸物起始的数值研究

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摘要

To study the influence of different quasi-isentropic loading modes on the ignition and the detonation growth processes of PBXs, a one-dimensional numerical model based on the DZK reaction rate model is presented, and then the parameters of DZK reaction rate model of PBXC03 can be experimental calibrated under the quasi-isentropic loadings. Moreover, the ignition and detonation growth processes of PBXC03 under different quasi-isentropic loading modes are simulated by using DYNA2D. It is found from the numerical results that both the increase of the peak pressure of shock front and the shock wave speed increase but the time to detonation decreases with the peak loading pressure, loading slope and curvature. It is also found that the explosive initiation process under the quasi-isentropic loadings can be divided into two stages: one is the initial stage that manifests mainly as the catch-up and convergence of the quasi-isentropic waves and the formation of shock waves; the other is the stage of shock initiation, in which a shock wave with a certain intensity is formed and grows gradually into a stable detonation wave. In addition, a necessary condition is proposed to discriminate the feasibility of an quasi-isentropic loading experimental calibration of the EOS parameters of a unreacted explosive, i. e., the sample's thickness must be smaller than the thickness of initial reaction.
机译：为了研究不同准二等级加载模式对PBX的点火和爆轰生长过程的影响，提出了一种基于DZK反应速率模型的一维数值模型，然后PBXC03的DZK反应速率模型参数在准熵载荷下进行实验性校准。此外，通过使用DYNA2D模拟不同准二熵加载模式下PBXC03的点火和爆轰生长过程。从数值结果中发现，震动前沿的峰值压力的增加和冲击波速度的增加，但爆炸时间随峰值负载压力，装载斜率和曲率而降低。还发现准二等级载荷下的爆炸性起始过程可分为两个阶段：一个是初始阶段，其主要表现为准二等熵波的追赶和收敛性和冲击波的形成;另一个是冲击启动的阶段，其中形成具有一定强度的冲击波并且逐渐生长到稳定的爆轰波中。此外，提出了必要的条件以区分对eos参数的准二等级载荷实验校准的可行性，即未反应的爆炸物，i。即，样品的厚度必须小于初始反应的厚度。

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