Influence of Void Configurations on Hot Spot Temperature in PBXs under Impact Loading,Propellants, Explosives, Pyrotechnics

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Influence of Void Configurations on Hot Spot Temperature in PBXs under Impact Loading
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-18 , DOI: 10.1002/prep.202000268
Chun Liu ₁ , Zhuo Cheng Ou ₁ , Zhuo Ping Duan ₁ , Feng Lei Huang ₁

Affiliation

In this study, similarity analysis and mesoscale simulations were performed to investigate hot spot temperatures in triangular voids inside polymer-bonded explosives (PBXs). We found that there are two different void collapse modes, namely single and double hydrodynamic jet modes. The hot spot temperatures achieved in the double hydrodynamic jet mode are much higher than previous predictions, such as predictions based on circular voids, which agrees with recent experimental observations. Additionally, we verified that void configuration (position and shape) plays a significant role in increasing hot spot temperatures, implying that when establishing a mesoscale reaction rate model, it is insufficient to use void volume alone to characterize the impact sensitivity of PBXs. Finally, two semi-empirical analytical expressions are proposed to represent the dependence of hot spot temperature on both the void configuration and shock intensity. The resulting theoretical predictions are in good agreement with the numerically simulated results. Such mesoscale analytical expressions can be used for establishing theoretical mesoscale hot spot ignition rate models in the future.

中文翻译：

冲击负载下空隙配置对PBX热点温度的影响

在这项研究中，进行了相似性分析和中尺度模拟，以研究聚合物粘结炸药 (PBX) 内三角形空隙中的热点温度。我们发现有两种不同的空隙坍塌模式，即单流体动力射流模式和双流体动力射流模式。在双流体动力射流模式中实现的热点温度远高于先前的预测，例如基于圆形空隙的预测，这与最近的实验观察一致。此外，我们验证了空隙配置（位置和形状）在提高热点温度方面起着重要作用，这意味着在建立中尺度反应速率模型时，仅使用空隙体积来表征 PBX 的冲击敏感性是不够的。最后，提出了两个半经验解析表达式来表示热点温度对空隙配置和冲击强度的依赖性。由此产生的理论预测与数值模拟结果非常吻合。这样的中尺度解析表达式可用于将来建立理论中尺度热点点火率模型。

更新日期：2021-03-18

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