Partial Reparametrization of the BKW Equation of State for DNAN-Based Melt-Cast Explosives

DNAN-based melt-cast explosives are a type of new, insensitive munitions (IM) explosives. Quickly determining munitions’ explosive properties is extremely important during the formulation design stage. The aim of this study was to partially reparameterize BKW-EOS (only β and κ were reparameterized on the basis of the parameters (α, β, κ, and θ) of classical BKW-RDX set and BKW-TNT set) to more accurately predict the properties of DNAN-based melt-cast explosives. A new set of parameters β and κ was obtained (β=0.19, κ=9.81) according to measured detonation velocity and detonation pressure for ideal DNAN-based melt-cast formulations (DNAN/RDX and DNAN/HMX). For non-ideal DNAN-based melt-cast formulations (DNAN/RDX/Al and DNAN/HMX/Al), aluminum oxidation degree was first determined according to the measured detonation heat; then, another new set of parameters β and κ was obtained in the same way as the ideal formulations (β=0.24, κ=8.5). The predicted detonation properties with BKW reparametrization for DNAN-based melt-cast explosives agreed with the measured data.