Abstract
Reactive material (RM) is a new type of energetic material, which is widely used in the military technology fields such as fragmentation warheads and shaped charge warheads. Violent chemical reactions take place in the impact process of reactive materials, and how to realize the macro numerical simulation of shock-induced energy release behavior of reactive materials is one of the most urgent problems to be solved for its future military applications. In this study, a numerical simulation approach and procedure is proposed, which can simulate the shock-induced energy release behavior of reactive materials on a macro scale. Firstly, program implementation of the mechanical-thermal-chemical coupled effect model for RM is realized in the second-development interface of LS-DYNA software. Then, the adaptive simulated annealing algorithm is used to fit the chemical reaction kinetic parameters of RM using the direct ballistics test data. Finally, the simulation calculation of the fragment penetrating upon steel plate is carried out to expand the applicability of the numerical simulation approach proposed in this study. The results show that the numerical simulation approach proposed in this study can reproduce the results of the direct ballistics test more accurately, which assumes practical significance for the engineering application of reactive materials in the military field in the future.
Highlights
Reactive material (RM) is a special energetic material, which is inert under normal temperature and pressure, while upon strong impact it can react dramatically and release a lot of chemical energy
Warhead fragments made of reactive material can release a large amount of chemical energy on the target in addition to the kinetic energy damage [2, 3]. e inner core of PELE bombs made of reactive materials can enhance the cracking of shells after penetration, resulting in both physical and chemical damage to the target [4]. e metal shape charge of armor penetration warhead made of reactive material can form a reactive jet containing chemical reactions and enhance the penetration effect of the jet [5, 6]
Applying polynomial fitting to the direct ballistic test data shown in Table 1, we find that the impact velocity threshold for the reaction of Al/Ni reactive material is 1054 m s− 1
Summary
Reactive material (RM) is a special energetic material, which is inert under normal temperature and pressure, while upon strong impact it can react dramatically and release a lot of chemical energy. Xiong [12] obtained the shockinduced temperature rise and chemical reaction threshold of reactive materials through theoretical calculation employing results of direct ballistic tests; he derived the chemical kinetic parameters by fitting test data, which proved the effectiveness of this method. En, the adaptive simulated annealing algorithm is used to fit direct ballistics test data, which yields chemical reaction kinetic parameters of the reactive material. The JWL EOS of the reactants and products and the chemical kinetics equation is embedded into LS-DYNA in the form of user-defined EOS, and the numerical simulation is carried out In this way, program implementation of the mechanical-thermal-chemical coupled effect model for reactive materials is realized. E chemical kinetic parameters of the reactive material are obtained after 10 iterations (when S 1.546 × 10− 4) (refer to Table 6)
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