Surrogate Hot-spot Models for High-fidelity Simulations of Shock to Detonation Transition

Marisol Koslowski

Localized regions of high temperature, known as hot-spots, develop when materials are subjected to shock loading. The size and temperature of hot-pots are controlled by the microstructure, including voids, micro-cracks, grain boundaries, and interfaces. The length scales associated with these processes range from nanometers to micrometers. However, typical run to detonation distances are in the millimeter scale. Therefore, surrogate hot-spot models need to be developed to understand their effect on detonation. We developed surrogate models that are informed from atomistic and mesoscale simulations and describe jetting and recompression. Interestingly, some of these models present scaling behavior from nanometers to micrometers. We present finite element simulations that combine these surrogate models with mesoscale behavior such as crack growth and plasticity to predict their relationship to the sensitivity of the material to detonation.

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