Journal article
Physically evocative meso-informed sub-grid source term for energy localization in shocked heterogeneous energetic materials
Journal of applied physics, Vol.134(16), 165901
10/28/2023
DOI: 10.1063/5.0165617
Abstract
Reactive burn models for heterogeneous energetic materials (EMs) must account for chemistry as well as microstructure to predict shock-to-detonation transition (SDT). Upon shock loading, the collapse of individual voids leads to ignition of hotspots, which then grow and interact to consume the surrounding material. The sub-grid dynamics of shock-void interactions and hotspot development are transmitted to macro-scale SDT calculations in the form of a global reactive “burn model.” This paper presents a physically evocative model, called meso-informed sub-grid source terms for energy localization (MISSEL), to close the macro-scale governing equations for calculating SDT. The model parameters are explicitly related to four measurable physical quantities: two depending on the microstructure (the porosity ϕ and average pore size D¯void), one depending on shock–microstructure interaction (the fraction of critical voids ξcr), and the other depending on the chemistry (the burn front velocity Vhs). These quantities are individually quantifiable using a small number of rather inexpensive meso-scale simulations. As constructed, the model overcomes the following problems that hinder the development of meso-informed burn models: (1) the opacity of more sophisticated surrogate/machine-learning approaches for bridging meso- and macro-scales, (2) the rather large number of high-resolution mesoscale simulations necessary to train machine-learning algorithms, and (3) the need for calibration of many free parameters that appear in phenomenological burn models. The model is tested against experimental data on James curves for a specific class of pressed 1,3,5,7-tetranitro-1,3,5,7-tetrazoctane materials. The simple, evocative, and fast-to-construct MISSEL model suggests a route to develop frameworks for physics-informed, simulation-derived meso-informed burn models.
Details
- Title: Subtitle
- Physically evocative meso-informed sub-grid source term for energy localization in shocked heterogeneous energetic materials
- Creators
- Yen NguyenPradeep Seshadri - University of IowaH Udaykumar - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of applied physics, Vol.134(16), 165901
- DOI
- 10.1063/5.0165617
- ISSN
- 0021-8979
- eISSN
- 1089-7550
- Publisher
- American Institute of Physics
- Grant note
- DOI: 10.13039/100000181, name: Air Force Office of Scientific Research, award: FA8651-16-1-0005; DOI: 10.13039/100014036, name: Multidisciplinary University Research Initiative, award: FA8651-16-1-0005
- Language
- English
- Date published
- 10/28/2023
- Academic Unit
- IIHR--Hydroscience and Engineering; Injury Prevention Research Center; Mechanical Engineering
- Record Identifier
- 9984500077302771
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