查看文章

The focus of this study is to measure, model, and further understand grain-scale shockwave dynamics including thermal ignition within spatially heterogeneous polymerbonded explosives (PBXs). Confident development of grain-scale and continuum-scale high explosive (HE) predictive performance models of shock induced detonation require significantly more experimental validation than is currently available. Here, we quantified the morphology of 100-200 μm thick PBX9502 discs using X-ray μ-tomography. Laserdriven shocks were launched into sample targets and line-imaging VISAR was used to measure particle speed profiles at HE-LiF interfaces. Particle speed and mean shock speed values including spatiotemporal hydrodynamic breakout profiles were compared to corresponding computed μ-tomography data. HE grain-scale numerical modeling results, with and without chemistry, further enabled interpretation of our line-VISAR data.