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Title: Physics of Explosives Initiation.

Abstract

Abstract not provided.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1399301
Report Number(s):
SAND2016-10000PE
648043
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the 2016 ET User's Group Meeting held October 11-12, 2016 in Park City, UT.
Country of Publication:
United States
Language:
English

Citation Formats

Phillips, Jason Joe. Physics of Explosives Initiation.. United States: N. p., 2016. Web.
Phillips, Jason Joe. Physics of Explosives Initiation.. United States.
Phillips, Jason Joe. 2016. "Physics of Explosives Initiation.". United States. doi:. https://www.osti.gov/servlets/purl/1399301.
@article{osti_1399301,
title = {Physics of Explosives Initiation.},
author = {Phillips, Jason Joe},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month =
}

Conference:
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  • In the context of the shock-initiation problem, we study analytically the first effects of chemistry, treating a small chemical heat release as a perturbation on an inert flow. Specifically, we study the initial transient in plane-shock initiation in a dilute explosive, where the chemical energy is small relative to the mechanical-thermal energy. The vehicle for the study is the mathematical analog for reactive flow. The solution resembles a double refraction: to first order, the pressure or density is a superposition of two forward-going waves, both originating at the rear boundary, and carrying the same function, but running at different velocities.more » Surprisingly, this first-order solution is independent of the sensitivity of the reaction rate to the state, which appears only at second order.« less
  • An experimental investigation has examined how different rates of unloading affect the release of chemical energy in a granular explosive experiencing transient shock compression. A compressed-gas gun was used to generate two types of short-pulse shocks in the explosive PBX-9404. A shock pressure of 3.2 GPa sustained for 0.37 ..mu..s was produced in both cases, but differences in flyer-plate properties resulted in different unloading histories. In one case the impact interface was rapidly unloaded by the initial release wave, while in the second case the unloading required multiple release waves over several microseconds. A VISAR system was used to observemore » the evolution of these two waves for distances up to 10 mm. The recorded waveforms showed that the unloading rates had a dominant effect on chemical energy release and growth towards detonation. This effect is important for considerations of critical impact criteria, and should provide a strong test for predictive shock-initiation models.« less
  • Potassium picrate (KP) and KP blended with PETN or HMX can be ignited by a hot wire. Maximum gas pressure generation occurs in several milliseconds and is about 0.3 GPa in a volume of 1 cm/sup 3/. The shock from detonating PETN initiates small, brass-confined pressings of KP to steady detonation velocities of 3.5 to 5.5 km/s in the density range 1.0 to 1.6 Mg/m/sup 3/. KP mixes can be employed as deflagrating donor mixtures in 2 types of electric detonators. In one the high pressure deflagration drives a stress wave into an explosive in which the deflagration is transformedmore » into a detonation. In the other the high pressure accelerates a flying plate which initiates detonation in an acceptor explosive upon impact.« less
  • The three dimensional Arbitrary Lagrange Eulerian hydrodynamic computer code ALE3D with fully coupled thermal-chemical-mechanical material models provides the framework for the development of a physically realistic model of shock initiation and detonation of solid explosives. The processes of hot spot formation during shock compression, subsequent ignition of reaction or failure to react, growth of reaction in individual hot spots, and coalescence of reacting hot spots during the transition to detonation can now be modeled using Arrhenius chemical kinetic rate laws and heat transfer to propagate the reactive flow. This paper discusses the growth rates of reacting hot spots in HMXmore » and TATB and their coalescence during shock to detonation transition. Hot spot deflagration rates are found to be fast enough to consume explosive particles less than 10 mm in diameter during typical shock duration times, but larger particles must fragment and create more reactive surface area in order to be rapidly consumed.« less