High Explosive Thermodynamic Equations
Of State For Combined Fragmentation And
Blast Loading
Author(s)
E. L. Baker, G. M. Stunzenas, L. I. Stiel, D. Murphy & A. Enea
Abstract
There is an increasing emphasis on the modeling of security related blast events
that produce both fragmentation and blast loading. The Jones-Wilkins-Lee-
Baker (JWLB) thermodynamic equation of state was originally developed to
more accurately describe overdriven detonation, while maintaining an accurate
description of high explosive products early expansion work output associated
with metal pushing and fragmentation. The equation of state is more
mathematically complex than the Jones-Wilkins-Lee equation of state, as it
includes an increased number of parameters to describe the principle isentrope,
as well as a Gruneisen parameter formulation that is a function of specific
volume. Although the increased mathematical complexity over JWL was
originally implemented in order to model both overdriven detonation and early
volume expansion work output, it has been found that this increased
mathematical complexity also allows the flexibility to parameterize higher
volume work output associated with blast output. As increased numbers of
parameters can mean increased calibration complexity and does not guarantee
increased accuracy for practical problems of interest, calibration techniques have
been developed to provide robust detonation products equation of state
parameters that are applicable to the broad range of high explosive work output
associated with overdriven detonation (wave shapers), early volume expansion
(metal pushing) and late volume expansion (blast). This paper presents a method
of parameter calibration: formal optimization using JAGUAR thermo-chemical
predictions to cylinder test and high volume total work output associated with
blast overpressure and impulse. The calibration procedure details are presented,
Keywords
blast, explosives, equation of state, shock, impulse, modelling
Related Book
Other papers in this volume
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