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Shaped‐Charge Jet‐Initiation of Covered RDX‐Based Aluminized Explosives and Effect of Temperature
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-07-16 , DOI: 10.1002/prep.201900378 Pin Zhao 1 , Lang Chen 1 , Kun Yang 1 , Yiwen Xiao 1 , Kaining Zhang 1 , Jianying Lu 1 , Junying Wu 1
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-07-16 , DOI: 10.1002/prep.201900378 Pin Zhao 1 , Lang Chen 1 , Kun Yang 1 , Yiwen Xiao 1 , Kaining Zhang 1 , Jianying Lu 1 , Junying Wu 1
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Understanding the shaped‐charge jet‐initiation mechanism of covered explosives and the effect of explosive temperature is important for ammunition safety. We devised a method of using a shaped‐charge jet‐penetrating cover to shock‐initiate heated explosives. This method achieves uniform temperature control of explosives via heating the upper and lower ends and preserves heat on the side of the explosive charge. We experimentally tested the method on hexahydro‐1,3,5‐trinitro‐1,3,5‐triazine (RDX)‐based aluminized explosives (61 wt.% RDX, 30 wt.% Al, 9 wt.% binder) at different temperatures and cover thicknesses. The jet‐penetration behavior and explosive detonation‐wave growth were observed via X‐ray photography, and the effect of explosive temperature on jet initiation was analyzed. A numerical model of the shaped‐charge jet‐initiating explosive was set up by considering the temperature change of the explosive and analyzing the detonation‐wave growth and initiation thresholds of different explosive temperatures under jet shock initiation. Under a thin cover, the explosive showed prompt impact initiation by the jet; the initiation occurred very near to the explosive surface. However, for a thick cover, the explosion was initiated by a bow wave formed at a certain distance from the upper surface of the explosive, and a retonation wave was observed. The temperature of RDX‐based aluminized explosives affects the two jet‐initiation mechanisms. The shock sensitivity of the explosives to the jet decreased with increasing temperature, but the shock sensitivity increased when the temperature exceeded a certain value. A simulation method was established that can be used to predict shaped‐charge jet initiation at different explosive temperatures. We obtained the relationship between the cover thickness and run‐to‐detonation distance under jet shock initiation, which provides a theoretical basis for safety analysis and evaluation of a warhead charge that is attacked by a shaped‐charge jet.
中文翻译：
基于RDX的含铝炸药的异形电荷喷射引发和温度的影响
了解弹药的定型射流起爆机理和炸药温度的影响对弹药安全很重要。我们设计了一种使用聚能射弹穿透盖来冲击引发爆炸物的方法。该方法通过加热上下两端来实现炸药的均匀温度控制，并在炸药装料侧保持热量。我们在六氢1,3,5-三硝基-1,3,5-三嗪（RDX）基镀铝炸药（61 wt％RDX，30 wt％Al，9 wt％粘结剂）上进行了实验测试不同的温度和覆盖层厚度。通过X射线照相观察了射流的穿透行为和爆炸波的增长，并分析了爆炸温度对射流起爆的影响。通过考虑炸药的温度变化并分析在冲击激射作用下不同炸药温度下的爆炸波增长和起爆阈值，建立了聚能装药喷射起爆炸药的数值模型。在薄薄的覆盖层下，爆炸物显示了喷气机迅速引发的冲击。爆炸发生在爆炸表面附近。但是，对于较厚的覆盖层，爆炸是通过在距炸药上表面一定距离处形成的弓形波引发的，并观察到了爆炸波。基于RDX的含铝炸药的温度会影响两种喷射引发机制。炸药对射流的冲击敏感度随温度升高而降低，但当温度超过一定值时，冲击敏感度增加。建立了一种模拟方法，该方法可用于预测不同爆炸温度下的聚能射流起爆。我们获得了喷射冲击引发下的覆盖层厚度与爆轰距离之间的关系，这为安全分析和评估由成形装药射流攻击的弹头装药提供了理论基础。
更新日期：2020-09-02
中文翻译：
基于RDX的含铝炸药的异形电荷喷射引发和温度的影响
了解弹药的定型射流起爆机理和炸药温度的影响对弹药安全很重要。我们设计了一种使用聚能射弹穿透盖来冲击引发爆炸物的方法。该方法通过加热上下两端来实现炸药的均匀温度控制，并在炸药装料侧保持热量。我们在六氢1,3,5-三硝基-1,3,5-三嗪（RDX）基镀铝炸药（61 wt％RDX，30 wt％Al，9 wt％粘结剂）上进行了实验测试不同的温度和覆盖层厚度。通过X射线照相观察了射流的穿透行为和爆炸波的增长，并分析了爆炸温度对射流起爆的影响。通过考虑炸药的温度变化并分析在冲击激射作用下不同炸药温度下的爆炸波增长和起爆阈值，建立了聚能装药喷射起爆炸药的数值模型。在薄薄的覆盖层下，爆炸物显示了喷气机迅速引发的冲击。爆炸发生在爆炸表面附近。但是，对于较厚的覆盖层，爆炸是通过在距炸药上表面一定距离处形成的弓形波引发的，并观察到了爆炸波。基于RDX的含铝炸药的温度会影响两种喷射引发机制。炸药对射流的冲击敏感度随温度升高而降低，但当温度超过一定值时，冲击敏感度增加。建立了一种模拟方法，该方法可用于预测不同爆炸温度下的聚能射流起爆。我们获得了喷射冲击引发下的覆盖层厚度与爆轰距离之间的关系，这为安全分析和评估由成形装药射流攻击的弹头装药提供了理论基础。
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