The Role of Al Reaction Rate in the Damage Effect and Energy Output of RDX‐Based Aluminized Explosives in Concrete

Abstract

This paper aims to improve the understanding of how the aluminum reaction rate affects the damage effect and energy output of RDX‐based aluminized explosives in concrete. A calculation method for the dynamic response of concrete and energy output of RDX‐based aluminized explosive is proposed based on the time‐dependent Jones‐Wilkins‐Lee equation of state (JWL‐EOS), cavity expansion model and energy partition theory, which is in turn verified through experiments with 70 g RDX/Al/wax (65 %/30 %/5 %) charge embedded in concrete. Based on the proposed method, the dynamic response of concrete and energy output of RDX/Al/wax with four different aluminum reaction rates were calculated. The results indicate a positive correlation between the crushed region radius and the aluminum reaction rate, and that the cracked region radius is inversely proportional to the aluminum reaction rate. For the energy output of RDX/Al/wax, the shock wave energy grows with increasing aluminum reaction rate, while the detonation products expansion energy increases and then drops with rising aluminum reaction rate, peaking at 2.37 MJ/kg when the Al reaction rate constant M=0.02. The calculation method presented in this paper are of great significance for investigating and improving the performance of RDX‐based aluminized explosives in concrete.