Effect of explosive shock on the mechanical property and energy release characteristics of an Al/Ni reactive material

Abstract

Reactive materials applied to warhead fragments or charge liner will be driven by strong detonation, so their mechanical behavior and energy release characteristics will be affected to a certain extent. In this paper, dynamic and static mechanical tests and impact initiation experiment were carried out on the detonation-loaded Al/Ni reactive material. Compared with materials that have not subjected to explosive shock, it is found that Al/Ni materials have better mechanical strength after explosive shock. Meanwhile, the impact-initiated energy release efficiency of the material is lower, when loaded with 14.76GPa, 21.79GPa and 28.84GPa, the reaction degree decreased by 26.6%, 78.8% and 80.5% respectively. Due to the incompatibility of elastic modulus and melting point between aluminum and nickel particles, the nickel particles move and aggregate in the aluminum matrix during shock loading. The pores appear at the particle boundaries, and gradually expand into cracks. The research results show that the original material parameters cannot be used to judge the working conditions of the reactive materials, and the explosive conditions of the loading are external factors that requires additional consideration.