Fragment Velocity Formula for Reverse Detonation Driving with Opposite Initiation,Propellants, Explosives, Pyrotechnics

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Fragment Velocity Formula for Reverse Detonation Driving with Opposite Initiation
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-10-21 , DOI: 10.1002/prep.202000162
Yuan Li _{1,

2} , Li Cheng ₂ , Yuquan Wen ₂

Affiliation

In detonation driving problems, the explosive charge is typically initiated on one side of the charge and the fragment or plate is located on the other side. Many studies have been conducted on this driving style, which has numerous practical applications. However, few studies have been conducted on reverse detonation driving, wherein the initiation point is located on the same side as that of the fragment. Reverse detonation driving can lower the shock pressure in the fragment and solve the problem of spallation. In this study, the model of opposite initiation of cylindrical charge is used to investigate the reverse detonation driving style. A long element is considered along the direction of the initiation points and the warhead center, and a fragment velocity formula is established according to the one‐dimensional gas dynamics. Then, based on the influences of the assumptions, such as the rigid constraint of the element, three experimentally verified numerical models are used to validate the established formula. The ratios of the formula computations and the corresponding modeling results exhibit similar trends. Therefore, these trends are fitted together and used as a correction factor for the established formula. The corrected formula is further validated through two‐dimensional modeling with a different casing material model and three‐dimensional modeling of the verified experimental configuration. The established formula can be used as a reference for the problem of reverse detonation driving.

中文翻译：

反向起爆反导爆破的碎片速度公式

在爆炸驱动问题中，爆炸装药通常在装药的一侧引发，而碎片或板位于另一侧。关于这种驾驶方式已经进行了许多研究，具有许多实际应用。然而，很少有关于反爆轰驱动的研究，其中起始点与碎片的爆炸面位于同一侧。反向爆轰驱动可以降低碎片中的冲击压力并解决散裂问题。在这项研究中，圆柱装药的相反起爆模型用于研究反爆轰驱动方式。沿起始点和战斗部中心的方向考虑了一个长单元，并根据一维气体动力学建立了碎片速度公式。然后，根据假设的影响，例如单元的刚性约束，使用三个经过实验验证的数值模型来验证所建立的公式。公式计算的比率和相应的建模结果显示出相似的趋势。因此，将这些趋势拟合在一起并用作已建立公式的校正因子。通过使用不同套管材料模型的二维建模和经过验证的实验配置的三维建模，可以进一步验证校正后的公式。所建立的公式可以作为反爆轰驱动问题的参考。公式计算的比率和相应的建模结果显示出相似的趋势。因此，将这些趋势拟合在一起并用作已建立公式的校正因子。通过使用不同套管材料模型的二维建模和经过验证的实验配置的三维建模，可以进一步验证校正后的公式。所建立的公式可以作为反爆轰驱动问题的参考。公式计算的比率和相应的建模结果显示出相似的趋势。因此，将这些趋势拟合在一起并用作已建立公式的校正因子。通过具有不同套管材料模型的二维建模和已验证的实验配置的三维建模，可以进一步验证校正后的公式。所建立的公式可以作为反爆轰驱动问题的参考。通过具有不同套管材料模型的二维建模和已验证的实验配置的三维建模，可以进一步验证校正后的公式。所建立的公式可以作为反爆轰驱动问题的参考。通过具有不同套管材料模型的二维建模和已验证的实验配置的三维建模，可以进一步验证校正后的公式。所建立的公式可以作为反爆轰驱动问题的参考。

更新日期：2020-12-07

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