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Title: DOUBLE SHOCK INITIATION OF THE EXPLOSIVE EDC-37

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., Los Alamos, NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
783323
Report Number(s):
LA-UR-01-3384
TRN: US200201%%29
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Jun 2001
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; CHEMICAL EXPLOSIVES; IGNITION; COMBUSTION KINETICS

Citation Formats

R. L. GUSTAVSEN, S. A. SHEFFIELD, and ET AL. DOUBLE SHOCK INITIATION OF THE EXPLOSIVE EDC-37. United States: N. p., 2001. Web.
R. L. GUSTAVSEN, S. A. SHEFFIELD, & ET AL. DOUBLE SHOCK INITIATION OF THE EXPLOSIVE EDC-37. United States.
R. L. GUSTAVSEN, S. A. SHEFFIELD, and ET AL. Fri . "DOUBLE SHOCK INITIATION OF THE EXPLOSIVE EDC-37". United States. doi:. https://www.osti.gov/servlets/purl/783323.
@article{osti_783323,
title = {DOUBLE SHOCK INITIATION OF THE EXPLOSIVE EDC-37},
author = {R. L. GUSTAVSEN and S. A. SHEFFIELD and ET AL},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2001},
month = {Fri Jun 01 00:00:00 EDT 2001}
}

Conference:
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  • No abstract prepared.
  • Over the past nine years in Los Alamos we have studied shock initiation of detonation in single crystals of PETN explosive. We have demonstrated the effects of point defects and crystal orientation on shock sensitivity. Here we report recent work on orientation effects and anomalous detonation in <110> orientation at 4 GPa. 5 refs.
  • Phenomenological shock initiation models, such as Ignition and Growth (I and G) and Johnson-Tang-Forest (JTF), have been very successful in predicting the vast majority of reactive flow states produced during shock initiation and detonation of solid explosives. However, because their reaction rates are pressure and compression dependent and their equations of state are not complete enough to describe all of the available experimental data, these models can not be expected to describe all explosive initiation phenomena. For example, the effects of initial particle size distributions and initial temperature can not be modeled without defining a separate set of model coefficientsmore » for each condition. Therefore a new shock initiation model is being developed in the ALE3D and LS-DYNA2D/3D hydrodynamic codes, in which heat transfer and detailed chemical kinetic mechanisms are directly coupled into the hydrodynamic equations. This model creates ''hot spots'' by various postulated mechanisms (void collapse, friction, shear, etc.), determines whether these hot spots are large and hot enough to react and grow, and then calculates the spreading rates of the growing reaction sites. The reactions are propagated as they are in nature: by heat transfer using Arrhenius kinetics. The chemical decomposition mechanisms are based on thermal explosion experimental data. The most difficult problem encountered thus far involves modeling the physical mechanisms that produce the large increases in reactive surface area necessary to produce the rapid pressure buildups measured during transitions to detonation. Current research on reaction rates, equations of state, mixture rules, etc. are discussed. The experimental techniques and measurements required for model normalization are also discussed.« less
  • Shock initiation experiments on the explosive PBX9501 (95% HMX, 2.5% estane, and 2.5% nitroplasticizer by weight) were performed at 150 C to obtain in-situ pressure gauge data and Ignition and Growth modeling parameters. A 101 mm diameter propellant driven gas gun was utilized to initiate the PBX9501 explosive with manganin piezoresistive pressure gauge packages placed between sample slices. The run-distance-to-detonation points on the Pop-plot for these experiments showed agreement with previously published data and Ignition and Growth modeling parameters were obtained with a good fit to the experimental data. This parameter set will allow accurate code predictions to be calculatedmore » for safety scenarios involving PBX9501 explosives at temperatures close to 150 C.« less