A Systematic Method to Determine and Test the Ignition and Growth Reactive Flow Model Parameters of a Newly Designed Polymer-Bonded Explosive

In this paper, a systematic method to determine and test the ignition and growth reactive flow model parameters of a new energetic material PBX 1314 (60weight% RDX, 16weight% aluminum and 24weight% HTPB) is presented. Cylinder test and shock initiation experiments are performed to study the shock initiation property of the explosive. Ignition and growth parameters are determined based on the experimental data. Test of the obtained parameters is performed by the comparison of the reaction fraction in the impact initiation and energy release experiments and the corresponding numerical simulations. The simulation results reveal that the proceeding of reaction and energy release are unsteady and inhomogeneous. Pressure decline quenches the reaction in the impact layer of the specimen although the impact pressure is more than 7GPa. Wave reflection and superposition strengthen the pressure in the top of the specimen and triggers detonation.