Modeling Multi-dimensional Shock-to-Detonation Transition of Pressed HMX Using a Meso-informed Ignition and Growth Model

In previous works we have demonstrated that traditional semi-empirical ignition and growth model that relies on parameters fit to empirical data can be successfully replaced by a meso-aware energy deposition model trained using ensembles of reactive void collapse simulations to predict the shock-to-detonation transition at the macro-scale. While quasi-1D studies have been successfully validated against the experimental results, here we extend the framework to a multi-dimensional setting. In this work, we perform shock-to-detonation transition (SDT) simulations of pressed HMXs to predict corner turning behavior. The Enhanced Corner Turning (ECOT) test provides a measure of pressure initiation sensitivity of an energetic material. As the detonation wave moves around a sharp corner, the wave dynamics and accompanying pressure field can lead to a failure in sustaining the detonation. The porosity of the material, size and shape of the voids and cracks, and shock loading all play a crucial role in this corner turning behavior. We use the meso-informed ignition and growth model (MES-IG) based multi-scale framework to study the detonation initiation and propagation regimes in an ECOT simulation. We also study the sensitivity of the corner turning behavior to variations in overall porosity and void diameter.