Effects of shock-induced chemical reaction on equation of state for Ni/Al energetic structural material

The equation of state (EOS) for energetic structural materials (ESMs) has been drawn a great attention due to the absent comprehensive understanding on the effect of the shock-induced chemical reaction. In this paper, the shock compression behavior of Ni/Al ESM is investigated by developing the EOS, which mainly considers the effects of the chemical reaction and the reaction products. The chemical reaction is based on the Avram-Erofeev kinetic law and the Arrhenius equation. The study concerns the shock pressure, the relative volume, the temperature, and the chemical reaction during the shock compression. The effects of the initial porosities, the stoichiometric ratios and inert additives were mainly discussed. The results showed that high porosity would induce high temperature rise. Different stoichiometric ratios would produce different temperature rise. When the stoichiometric ratio Ni: Al ​= ​1:1, the temperature rise is highest. In addition, the inert additive material would obviously reduce the temperature rise. Finally, the developed model improved the temperature calculation, compared with the existing model. The equation of state (EOS) for energetic structural materials (ESMs) has been drawn a great attention due to the absent comprehensive understanding on the effect of the shock-induced chemical reaction. This study investigated the shock compression behavior of Ni/Al ESM by considering the effects of the chemical reaction and the reaction product, which matched the experimental data well. The advantage of the model considered the effect of reaction product, which improved the EOS prediction compared existing model. This study investigated the effect of the porosity, the stoichiometric ratio of Ni/Al and inert material on the shock compression behavior. [Display omitted] •The EOS for Ni/Al ESM with chemical reaction is developed.•The EOS model describes the shock compression well.•The effect of porosity, stoichiometric ratio and additives on EOS is obtained.•The effect of chemical reaction on EOS is quantified.