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Title: Hot-spot generation and growth in shocked plastic-bonded explosives studied by optical pyrometry

Abstract

The aggregate behavior of hot spots in shocked plastic-bonded explosives (PBX) was studied by nanosecond optical pyrometry. The averaged thermal emission spectra from at least 25 tiny (50 μg) explosive charges of a pentaerythritol tetranitrate PBX, at several impact velocities from 1.5 to 4.5 km/s, was used to determine average temperatures and emissivities. Individual spectra were analyzed to determine the distribution of hot spot temperatures in individual charges with unique microstructures. Understanding shocks in tiny charges with different microstructures is needed to understand shocks in large PBX charges which sample many microstructures as they propagate. The initial hot spot density was several percent, and the average initial hot spot temperature of 4000 K was, surprisingly, independent of impact velocity. With underdriven shocks, the initial hot spot temperatures clustered around 4000 K, but with overdriven shocks, there were both hotter and colder hot spots. The initial hot spot density increased quadratically with impact velocity. The generation of hot spots was described by a model with a threshold energy to trigger hot spot formation and a distribution of energetic barriers to hot spot formation.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1545329
Alternate Identifier(s):
OSTI ID: 1525511
Grant/Contract Number:  
DGE - 1144245; AC52-07NA27344; @911NF-19-1-0037; FA9550-16-1-0042
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 21; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Bassett, Will P., Johnson, Belinda P., Salvati, Lawrence, and Dlott, Dana D. Hot-spot generation and growth in shocked plastic-bonded explosives studied by optical pyrometry. United States: N. p., 2019. Web. doi:10.1063/1.5098476.
Bassett, Will P., Johnson, Belinda P., Salvati, Lawrence, & Dlott, Dana D. Hot-spot generation and growth in shocked plastic-bonded explosives studied by optical pyrometry. United States. doi:10.1063/1.5098476.
Bassett, Will P., Johnson, Belinda P., Salvati, Lawrence, and Dlott, Dana D. Thu . "Hot-spot generation and growth in shocked plastic-bonded explosives studied by optical pyrometry". United States. doi:10.1063/1.5098476.
@article{osti_1545329,
title = {Hot-spot generation and growth in shocked plastic-bonded explosives studied by optical pyrometry},
author = {Bassett, Will P. and Johnson, Belinda P. and Salvati, Lawrence and Dlott, Dana D.},
abstractNote = {The aggregate behavior of hot spots in shocked plastic-bonded explosives (PBX) was studied by nanosecond optical pyrometry. The averaged thermal emission spectra from at least 25 tiny (50 μg) explosive charges of a pentaerythritol tetranitrate PBX, at several impact velocities from 1.5 to 4.5 km/s, was used to determine average temperatures and emissivities. Individual spectra were analyzed to determine the distribution of hot spot temperatures in individual charges with unique microstructures. Understanding shocks in tiny charges with different microstructures is needed to understand shocks in large PBX charges which sample many microstructures as they propagate. The initial hot spot density was several percent, and the average initial hot spot temperature of 4000 K was, surprisingly, independent of impact velocity. With underdriven shocks, the initial hot spot temperatures clustered around 4000 K, but with overdriven shocks, there were both hotter and colder hot spots. The initial hot spot density increased quadratically with impact velocity. The generation of hot spots was described by a model with a threshold energy to trigger hot spot formation and a distribution of energetic barriers to hot spot formation.},
doi = {10.1063/1.5098476},
journal = {Journal of Applied Physics},
number = 21,
volume = 125,
place = {United States},
year = {2019},
month = {6}
}

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