Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session T01: Grain Scale-to Continuum Modeling of ExplosivesRecordings Available
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Chair: Michael Sakano, Sandia National Laboratories Room: Anaheim Marriott Platinum 5 |
Thursday, July 14, 2022 9:15AM - 9:30AM |
T01.00001: Low-velocity impact sensitivity of HMX-based explosive compositions David DROUET, Didier Picart A numerical study of the heat generated by plasticity during the impact of a confined HMX-based PBX is detailed. It includes a literature review and previous experimental investigations at microscale and mesoscale. A crystal plasticity model has been implemented in an explicit solver to simulate polycristals submitted to shear. Using literature data for the HMX behaviour enables reproducing the mean stress-strain curve observed during quasi-static triaxial experiments at 0.8 GPa. Results from fifteen polycrystals have been used to relate the maximum local temperature to the macroscopic plastic shear strain. This localization rule has been used to predict initiation during low-velocity impacts of pyrotechnic structures incorporating HMX-based PBX. |
Thursday, July 14, 2022 9:30AM - 9:45AM |
T01.00002: Quantifying the Shock Induced Response of a Twin-Pore Arrangement in HMX David B Hardin, Jesus O Mares Jr., Joseph T Maestas In this study, we investigate the simulated shock induced decomposition of two circular pore structures within a HMX slab, with particular interest in the influence of the spatial arrangement of the two pores. Multiple simulations are conducted in the Eulerian hydrocode CTH to predict the temperature, pressure, and decomposition of material induced by a 10 GPa planar shock interacting with two pore structures over a range of spatial arrangements. The twin pores are positioned at varying distances and angles with respect to the shock front to quantify the effect of spatial arrangement on extent of reaction. Specifically, the minimum distance required such that the twin pore response approaches that of separated non-connected collapse events will be investigated. This information combined with detailed predictions of isolated pore behavior containing complex shape information can yield "influence" or "amplification" mapping tools to estimate the integrated sensitivity of a material exhibiting complex microstructure. |
Thursday, July 14, 2022 9:45AM - 10:00AM |
T01.00003: Upscaling Reaction Rates From Mesoscale Simulations of HMX-TNT Explosive Mixtures Using Machine Learning Methods H. Keo Springer, Matthew P Kroonblawd, Sorin Bastea, Christopher Miller Reaction rates are one the most complicated and uncertain components of continuum reactive flow models for heterogeneous explosives. They are influenced not only by chemistry but also by thermomechanical properties, microstructure, and loading conditions. In this study, we perform mesoscale simulations with the LLNL hydrocode, ALE3D, to investigate shock-induced reactions in HMX-TNT mixtures. The thermochemical code, Cheetah, provides temperature-dependent heat capacity, kinetics, and equation-of-state (EOS) properties for the energetic constituents. We employ an isotropic HMX material model has been updated from previous studies to incorporate pressure-dependent shear modulus as well as pressure-dependent melt curve and pressure/temperature-dependent shear viscosity based on molecular dynamics studies. Reaction rates are computed from mesoscale simulations for a range of HMX-TNT mixture ratios, applied pressures, porosity, and pore sizes. Rates are used to inform an existing reactive flow model and to train a surrogate rate model using machine learning methods. The performance of the reactive flow and surrogate models are evaluated and discussed. These studies are important for developing formulation-sensitive reactive flow models for explosive mixtures. |
Thursday, July 14, 2022 10:00AM - 10:15AM |
T01.00004: Surrogate hot-spot models for high-fidelity simulations of detonation in energetic materials Marisol Koslowski, Camilo A Duarte, Congxi Yuan Localized regions of high temperature, known as hot-spots, develop when materials are subjected to shock loading. This process is controlled by the microstructure of the material, including voids, micro-cracks, grain boundaries, and interfaces. As a result, local burning in an energetic material may lead to the formation of a reactive shock front. |
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