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Title: PETN spark-gap detonators

Abstract

The well-developed theory of Lorentz plasma that is dominated by electron–ion interactions is used to calculate the PETN arc characteristics. The spark-gap discharge current is a ramp with 10 to 25 ns rise time to peak and remaining constant subsequently. The approximate formulas for the arc channel conductivity, arc temperature, arc radius, and shock pressure from the arc are obtained from a system of nonlinear ordinary differential equations, which is the similarity solution of hydrodynamic equations similar to the Braginskii approximation. These arc parameters are given for the peak current ranging from 100 A to 1000 A and with different rise times. Representative cases are compared to the nonlinear ordinary differential equation code results. The shock pressures at the peak current are comparable to those from a typical commercial EBW bridgewire burst reported in the literature; the arc radius at the peak current is comparable to a typical bridgewire diameter of 0.0375 mm (e.g., RISI detonators, RP-1, and RP-80). The relevant Pop-Plot for low-density PETN is converted into an empirical detonation criterion, which is applicable to explosives subject to shocks of variable pressure. Finally, this criterion is then used to determine the detonation thresholds, which are comparable with test datamore » obtained by Tucker, et al.« less

Authors:
 [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Security
OSTI Identifier:
1619218
Report Number(s):
SAND-2020-1371J
Journal ID: ISSN 0737-0652; 683624
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Energetic Materials
Additional Journal Information:
Journal Name: Journal of Energetic Materials; Journal ID: ISSN 0737-0652
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
PETN; spark-gap; detonator; pop-plot; equation of state; arc radius; Lorentz plasma; shock

Citation Formats

Chen, Kenneth C., and Warne, Larry K. PETN spark-gap detonators. United States: N. p., 2020. Web. doi:10.1080/07370652.2020.1756986.
Chen, Kenneth C., & Warne, Larry K. PETN spark-gap detonators. United States. doi:https://doi.org/10.1080/07370652.2020.1756986
Chen, Kenneth C., and Warne, Larry K. Mon . "PETN spark-gap detonators". United States. doi:https://doi.org/10.1080/07370652.2020.1756986.
@article{osti_1619218,
title = {PETN spark-gap detonators},
author = {Chen, Kenneth C. and Warne, Larry K.},
abstractNote = {The well-developed theory of Lorentz plasma that is dominated by electron–ion interactions is used to calculate the PETN arc characteristics. The spark-gap discharge current is a ramp with 10 to 25 ns rise time to peak and remaining constant subsequently. The approximate formulas for the arc channel conductivity, arc temperature, arc radius, and shock pressure from the arc are obtained from a system of nonlinear ordinary differential equations, which is the similarity solution of hydrodynamic equations similar to the Braginskii approximation. These arc parameters are given for the peak current ranging from 100 A to 1000 A and with different rise times. Representative cases are compared to the nonlinear ordinary differential equation code results. The shock pressures at the peak current are comparable to those from a typical commercial EBW bridgewire burst reported in the literature; the arc radius at the peak current is comparable to a typical bridgewire diameter of 0.0375 mm (e.g., RISI detonators, RP-1, and RP-80). The relevant Pop-Plot for low-density PETN is converted into an empirical detonation criterion, which is applicable to explosives subject to shocks of variable pressure. Finally, this criterion is then used to determine the detonation thresholds, which are comparable with test data obtained by Tucker, et al.},
doi = {10.1080/07370652.2020.1756986},
journal = {Journal of Energetic Materials},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {5}
}

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Works referenced in this record:

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