Journal article
Multi-scale modeling of shock initiation of a pressed energetic material I: The effect of void shapes on energy localization
JOURNAL OF APPLIED PHYSICS, Vol.131(5), 055906
2022
DOI: 10.1063/5.0068715
Abstract
Accurate simulations of the shock response of heterogeneous energetic (HE) materials require closure models, which account for energy localization in the micro-structure. In a multi-scale framework, closure is provided by reaction rate models that account for ignition and growth of hotspots, allowing for prediction of the overall macro-scale sensitivity of a HE material. In the present meso-informed ignition and growth (MES-IG) model, the reaction rate is expressed as a function of shock pressure and morphology of the void field in a pressed energetic material. In MES-IG, the void morphology is quantified in terms of a limited number of parameters: viz., overall porosity, void size, and shape (aspect ratio and orientation). In this paper, we quantify the effects of arbitrary variations in void shapes on meso-scale energy deposition rates. A collection of voids of arbitrary shapes is extracted from scanning electron microscope (SEM) images of real, pressed HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) samples and classified into groups based on their similarity in shapes. Direct numerical simulations (DNS) are performed on the highly contorted "real " void shapes, and the calculated hotspot ignition and growth rates are compared with values predicted by the MES-IG. It is found that while the parameterization of complex void morphologies in terms of orientation and aspect ratio gives fairly good agreement between DNS and MES-IG reaction rates, the intricate details of highly complex void shapes impact hotspot characteristics to a significant extent. This work suggests possible improvements for the prediction of reaction rate in the energetic microstructure by adopting a more detailed description of shapes.
Details
- Title: Subtitle
- Multi-scale modeling of shock initiation of a pressed energetic material I: The effect of void shapes on energy localization
- Creators
- Yen Nguyen - University of IowaPradeep Seshadri - University of IowaOishik Sen - University of IowaD Barrett Hardin - Eglin Air Force BaseChristopher D Molek - Eglin Air Force BaseH S Udaykumar - University of Iowa
- Resource Type
- Journal article
- Publication Details
- JOURNAL OF APPLIED PHYSICS, Vol.131(5), 055906
- DOI
- 10.1063/5.0068715
- ISSN
- 1089-7550
- Grant note
- DOI: 10.13039/100000181, name: Air Force Office of Scientific Research, award: FA9550-15RWCOR123; DOI: 10.13039/100000181, name: Air Force Office of Scientific Research, award: FA955018- 18RWCOR108.; DOI: 10.13039/100006831, name: U.S. Air Force, award: FA8651-16-1-0005
- Language
- English
- Date published
- 2022
- Academic Unit
- IIHR--Hydroscience and Engineering; Injury Prevention Research Center; Mechanical Engineering
- Record Identifier
- 9984229963102771
Metrics
29 Record Views