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Influence of Void Configurations on Hot Spot Temperature in PBXs under Impact Loading
Author(s) -
Liu Chun,
Ou Zhuo Cheng,
Duan Zhuo Ping,
Huang Feng Lei
Publication year - 2021
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.202000268
Subject(s) - hot spot (computer programming) , void (composites) , mesoscale meteorology , mechanics , materials science , national ignition facility , explosive material , ignition system , hotspot (geology) , local void , physics , thermodynamics , inertial confinement fusion , composite material , meteorology , nuclear physics , plasma , two phase flow , flow (mathematics) , computer science , operating system , chemistry , organic chemistry , geophysics
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.