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Title: Quantification of probabilistic ignition thresholds of polymer-bonded explosives with microstructure defects

Abstract

Microscopic defects such as voids and cracks in an energetic material significantly influence its shock sensitivity. Currently, there is a lack of systematic and quantitative study of the effects of cracks both experimentally and computationally, although significant work has been done on voids. We present an approach for quantifying the effects of intragranular and interfacial cracks in polymer-bonded explosives (PBXs) via mesoscale simulations that explicitly account for such defects. With this method, the ignition thresholds corresponding to any given level of ignition probability and, conversely, the ignition probability corresponding to any loading condition (i.e., ignition probability maps) are predicted for PBX 9404 containing different levels of initial grain cracking or interfacial debonding. James relations are utilized to express the predicted thresholds and ignition probabilities. It is found that defects lower the ignition thresholds and cause the material to be more sensitive. This effect of defects on shock sensitivity diminishes as the shock load intensity increases. Furthermore, the sensitivity differences are rooted in energy dissipation and the consequent hotspot development. The spatial preference in hotspot distribution is studied and quantified using a parameter called the defect preference ratio (rpref). Analyses reveal that defects play an important role in the development ofmore » hotspots and thus have a strong influence on the ignition thresholds. The findings are in qualitative agreement with reported trends in experiments.« less

Authors:
 [1]; ORCiD logo [2];  [3];  [1]
+ Show Author Affiliations
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Air Force Research Lab. (AFRL), Eglin AFB, FL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE; US Air Force Office of Scientific Research (AFOSR); Defense Threat Reduction Agency (DTRA)
OSTI Identifier:
1564235
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 16; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Wei, Yaochi, Kim, Seokpum, Horie, Yasuyuki, and Zhou, Min. Quantification of probabilistic ignition thresholds of polymer-bonded explosives with microstructure defects. United States: N. p., 2018. Web. doi:10.1063/1.5031845.
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Wei, Yaochi, Kim, Seokpum, Horie, Yasuyuki, & Zhou, Min. Quantification of probabilistic ignition thresholds of polymer-bonded explosives with microstructure defects. United States. https://doi.org/10.1063/1.5031845
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Wei, Yaochi, Kim, Seokpum, Horie, Yasuyuki, and Zhou, Min. Mon . "Quantification of probabilistic ignition thresholds of polymer-bonded explosives with microstructure defects". United States. https://doi.org/10.1063/1.5031845. https://www.osti.gov/servlets/purl/1564235.
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@article{osti_1564235,
title = {Quantification of probabilistic ignition thresholds of polymer-bonded explosives with microstructure defects},
author = {Wei, Yaochi and Kim, Seokpum and Horie, Yasuyuki and Zhou, Min},
abstractNote = {Microscopic defects such as voids and cracks in an energetic material significantly influence its shock sensitivity. Currently, there is a lack of systematic and quantitative study of the effects of cracks both experimentally and computationally, although significant work has been done on voids. We present an approach for quantifying the effects of intragranular and interfacial cracks in polymer-bonded explosives (PBXs) via mesoscale simulations that explicitly account for such defects. With this method, the ignition thresholds corresponding to any given level of ignition probability and, conversely, the ignition probability corresponding to any loading condition (i.e., ignition probability maps) are predicted for PBX 9404 containing different levels of initial grain cracking or interfacial debonding. James relations are utilized to express the predicted thresholds and ignition probabilities. It is found that defects lower the ignition thresholds and cause the material to be more sensitive. This effect of defects on shock sensitivity diminishes as the shock load intensity increases. Furthermore, the sensitivity differences are rooted in energy dissipation and the consequent hotspot development. The spatial preference in hotspot distribution is studied and quantified using a parameter called the defect preference ratio (rpref). Analyses reveal that defects play an important role in the development of hotspots and thus have a strong influence on the ignition thresholds. The findings are in qualitative agreement with reported trends in experiments.},
doi = {10.1063/1.5031845},
journal = {Journal of Applied Physics},
number = 16,
volume = 124,
place = {United States},
year = {Mon Oct 29 00:00:00 EDT 2018},
month = {Mon Oct 29 00:00:00 EDT 2018}
}
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https://doi.org/10.1063/1.5031845
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    Works referencing / citing this record:

    Prediction of Probabilistic Detonation Threshold via Millimeter‐Scale Microstructure‐Explicit and Void‐Explicit Simulations
    journal, November 2019

    • Miller, Christopher; Kittell, David; Yarrington, Cole
    • Propellants, Explosives, Pyrotechnics, Vol. 45, Issue 2
    • DOI: 10.1002/prep.201900214

    Ignition thresholds of aluminized HMX-based polymer-bonded explosives
    journal, April 2019

    • Miller, Christopher; Kim, Seokpum; Horie, Yasuyuki
    • AIP Advances, Vol. 9, Issue 4
    • DOI: 10.1063/1.5052632
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