Jones–Wilkins–Lee (JWL) Equation of State for a DNAN‐Based Melt‐Cast Explosive

ABSTRACT 2,4‐dinitroanisole (DNAN)‐based melt‐cast explosives exhibit excellent stability and are widely used in the filling of insensitive munitions. To investigate the working capacity of DNAN‐based melt‐cast explosives, the Chapman–Jouguet (CJ) state and isentrope of detonation products were predicted using a thermochemical code with five equation of state (EOS), Becker–Kistiakowsky–Wilson (BKW), Kihara–Hikita–Tanaka (KHT), Virial‐Wu (VLW), Lennard‐Jones–Devonshire (LJD) and Jacobs–Cowperthwaite–Zwisler (JCZ). The parameters of the Jones–Wilkins–Lee (JWL) are determined by products Hugoniot with pressures above the CJ state and products isentrope with pressures below the CJ state, to accurately calculate the states over a range of pressures. Driven flyer plate experiments were performed employing three metals with different shock impedances: tungsten, copper and aluminium. Simulations with the calibrated JWLs and validation experiments were performed for an explosive‐driven flyer plate system. The results indicate that the computed velocity histories align closely with the experimental data, with the maximum velocity errors for tungsten and copper being below 3%. The good agreement between theoretical and experimental results validates the use of thermochemical code to predict the working capacity of explosives.