Numerical simulation research on the influence of aluminum reaction rate on the explosion damage effect inside the runway

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Abstract Aluminum-containing explosives are characterized of a high detonation heat and a long work duration, making them suitable for causing internal explosive damage to targets such as runway. The reaction rate of aluminum during the explosion process will affect the energy output process of the explosive, thereby affecting the destructive effect on the runway. In order to study the damage law of aluminum reaction rate on runway targets, this paper takes TKX-50 based aluminum explosive (TAE) as an example and uses finite element software to simulate the explosion process of the charge inside the runway. A systematic study was conducted on the explosion process and mechanism of aluminum-containing explosives with different aluminum reaction rates in the runway from the perspectives of damage process and energy transfer. Research has shown that during the stress wave failure stage, increasing the aluminum reaction rate can effectively increase the stress wave energy, enabling it to form a larger range of failure in the runway. In the stage of gas expansion, the reaction rate of aluminum directly affects the process of gas pressure attenuation in the cavity, thereby affecting the work ability of the product on the runway. When the aluminum reaction rate coefficient is a=5e-4, the aluminum reaction rate matches the gas leakage rate, allowing the heat energy released by the aluminum reaction to effectively compensate for the internal energy loss caused by gas leakage, slowing down the rate of gas pressure attenuation, and causing greater damage to the runway. In addition, the law of the influence of aluminum reaction rate on the effect of explosive damage in the runway is well adapted under different conditions of charge quality and burial depth.