Abstract
It is important to examine the ignition of energetic materials for launch safety. Given that there is a paucity of experimental tests, numerical simulations are important for analysing energetic materials. A computer program based on the finite volume method and viscoelastic statistical crack mechanics model is developed to study the ignition of energetic materials. The trends of temperature and stress of energetic materials subjected to projectile base pressure are studied by numerical examples. The results are compared with those in an extant study, which verified the correctness of the proposed method. Additionally, the relationships between the temperature increase and nonimpact ignition of energetic materials were analysed. The results show that when the temperature at the bottom of the explosive rises to a certain value, it will cause the explosive to ignite. This research has significance to the study of the base gap of explosives, and it provides a reference for launch safety evaluation of energetic materials.
Highlights
Launch safety has important research value [1,2,3,4,5,6]
The Visco-SCRAM model is usually embedded into finite element software [19,20,21,22]. erefore, a computer program based on the finite volume method and viscoelastic statistical crack mechanics model is developed for the launch safety of the explosive in this study
Based on the chemical kinetic Arrhenius equation used in this study, the criterion of ignition temperature is dT/dt ⟶∞ [37], which indicates that the temperature at the bottom of explosive has reached the ignition temperature and the explosive is ignited. e results show that when the temperature at the bottom of the explosive rises to a certain value, it will cause ignition
Summary
Launch safety has important research value [1,2,3,4,5,6]. Zhang Linjun studied the effect of thermal aging on launch safety of RDX-based aluminized and pressed explosive charge [7]. Erefore, the effect of temperature rise on ignition of the explosive has important research significance for explosion in the chamber and launch safety. E statistical crack mechanics (SCRAM) model is a representative mesodamage constitutive model for examining the damage of energetic materials. E viscoelastic statistical crack constitutive model is suitable for analysing dynamic damage of PBX explosives subjected to nearly isotropic stress, such as collision and impact [18]. Erefore, the viscoelastic statistical crack model is used to investigate the ignition of energetic materials in this study. Erefore, a computer program based on the finite volume method and viscoelastic statistical crack mechanics model is developed for the launch safety of the explosive in this study. Erefore, the finite volume method is used to study the launch safety of explosive in this study Explicit integral algorithm of time is used in FVM, which is more suitable for solving highly nonlinear problems such as explosions, impacts, and collisions. erefore, the finite volume method is used to study the launch safety of explosive in this study
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