Shear band formation in plastic bonded explosive (PBX)

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.55648· OSTI ID:302192

Dey, T N; Johnson, J N ^[1]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

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.}

• Sponsoring Organization: USDOE
• OSTI ID: 302192
• Report Number(s): CONF-970707--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 429; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
ADIABATIC PROCESSES
CHEMICAL EXPLOSIVES
COMPUTERIZED SIMULATION
CRACKS
EXPLOSIONS
GRANULAR MATERIALS
RHEOLOGY
SHEAR PROPERTIES
SIMULATION
STRAIN RATE