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Author Dey, T. N. ♦ Johnson, J. N.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE ♦ EXPLOSIONS ♦ SIMULATION ♦ CHEMICAL EXPLOSIVES ♦ SHEAR PROPERTIES ♦ ADIABATIC PROCESSES ♦ RHEOLOGY ♦ CRACKS ♦ STRAIN RATE ♦ GRANULAR MATERIALS ♦ COMPUTERIZED SIMULATION
Abstract Adiabatic shear bands can be a source of ignition and lead to detonation. At low to moderate deformation rates, 10{endash}1000 s{sup {minus}1}, two other mechanisms can also give rise to shear bands. These mechanisms are: 1) softening caused by micro-cracking 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 for 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{endash}2{percent} strain at nominal strain rates at and below 1000 s{sup {minus}1}. Shear band formation is suppressed at higher strain rates. Both mechanisms may accelerate the formation of adiabatic shear bands. {copyright} {ital 1998 American Institute of Physics.}
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 1998-07-01
Publisher Place United States
Volume Number 429
Issue Number 1
Technical Publication No. CONF-970707-


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