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Title: TRANSIENT DETONATION PROCESSES IN A PLASTIC BONDED EXPLOSIVE

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
783326
Report Number(s):
LA-UR-01-3380
TRN: AH200134%%292
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:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; EXPLOSIONS; EXPLOSIVES; PLASTICS; TRANSIENTS

Citation Formats

K. A. THOMAS, E. S. MARTIN, and ET AL. TRANSIENT DETONATION PROCESSES IN A PLASTIC BONDED EXPLOSIVE. United States: N. p., 2001. Web.
K. A. THOMAS, E. S. MARTIN, & ET AL. TRANSIENT DETONATION PROCESSES IN A PLASTIC BONDED EXPLOSIVE. United States.
K. A. THOMAS, E. S. MARTIN, and ET AL. Fri . "TRANSIENT DETONATION PROCESSES IN A PLASTIC BONDED EXPLOSIVE". United States. doi:. https://www.osti.gov/servlets/purl/783326.
@article{osti_783326,
title = {TRANSIENT DETONATION PROCESSES IN A PLASTIC BONDED EXPLOSIVE},
author = {K. A. THOMAS and E. S. MARTIN 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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  • A high energy explosive with an unusually low detonation velocity has been formulated for metal acceleration applications. This plastic-bonded explosive contains HMX, potassium perchlorate, aluminum and estane. Its energy is comparable to octol, yet its detonation velocity is only 7.4 mm/..mu..sec. This appears to be near the minimum detonation velocity that one can attain and still maintain a metal accelerating ability equivalent to octol.
  • Adiabatic shear bands can be a source of ignition and lead to detonation. At low to moderate deformation rates, 10-1000/s , two other mechanisms can also give rise to shear bands. These mechanisms are: 1) softening caused by microcracking and 2) a constitutive response with a non-associated flow rule as is observed in granular material such as soil. Brittle behavior at small strains and the granular nature of HMX suggest that PBX-9501 constitutive behavior may be similar to sand. A constitutive model for the first of these mechanisms is studied in a series of calculations. This viscoelastic constitutive model formore » PBX-9501 softens via a statistical crack model. A sand model is used to provide a non-associated flow rule and detailed results will be reported elsewhere. Both models generate shear band formation at 1-2% strain at nominal strain rates at and below 1000/s. Shear band formation is suppressed at higher strain rates. Both mechanisms may accelerate the formation of adiabatic shear bands.« less
  • We report measurements of the surface temperature from confined PBX 9501 subject to impact in the range 0.5-1 GPa. The temperatures were obtained by IR radiometry with 80 {micro}m and 1 {micro}s spatial and temporal resolution, respectively. Two distinct types of experiment are reported. In one the shock was coupled into the sample through a sharp edged, shearing impactor, resulting in high, localized temperatures in the sheared boundary of the explosive. In the second a planar shock was used, and SiC particulate was spread uniformly across the explosive to induce frictional heating. Very high, uniformly distributed surface temperatures were observedmore » in this case. In both types of experiment the temperature profile as a function of time exhibits a sharp rise, followed by a constant induction period of localized ignition. The measured induction time and temperature compare favorably with that predicted by the thermal decomposition model of HMX proposed by McGuire and Tarver.« less
  • Pressed plastic-bonded explosives, PBXs, are commonly used by defense and private industry. PBX 9501 is composed of HMX crystals held together with a plastic binder 'softened' with plasticizers. The detonation behavior of any explosive is very dependent upon its density, with the desire to have a uniform, high density throughout the explosive component. A parametric study has been performed pressing PBX 9501 hydrostatically and uniaxially. The effects of several pressing parameters on the bulk density and density profile, as well as mechanical properties, have been measured. The parameters investigated include pressure, temperature, number of cycles, dwell time, rest time, sackmore » thickness, and particle distribution and size. Density distributions within the pressed explosives were also compared.« less