1 VALIDATION EXPERIMENTS FOR MODELING SLOW COOK-OFF

Slow cook-off experiments were conducted with measurements of temperature, pressure, and volume until the onset of ignition; time and position for onset of ignition; and reaction violence (case deformation and blast overpressure) following ignition. Confinement, gas sealing, and heating profile were varied in experiments on the RDX-based explosive PBXN-109 and on the HMX-based explosive PBXN-5. Pre- and post-ignition behavior for PBXN-109 was modeled for the experimental arrangement based on available characterization measurements for the heated explosive. While reasonable predictions of time for ignition are attained, the post-ignition wall expansion was over-predicted. More characterization of the enhanced burning rate for thermally degraded explosives is required to predict reaction violence