Compaction of granular HMX: P-α porosity model in CTH hydrocode

K. S. Mahon, Taewoo Lee

Research output: Contribution to journalArticle

Abstract

Compaction waves traveling through porous cyclotetramethylene-tetranitramine (HMX) are computationally modeled using the Eulerian hydrocode CTH and validated with gas gun experimental data. The method employed use of a newly generated set of P-α parameters for granular HMX in a Mie-Gruneisen equation of state. The P-α model adds a separate parameter to differentiate between the volume changes of a solid material due to compression from the volume change due to compaction, void collapse in a granular material. Computational results are compared via five validation schema for two different initial-porosity experiments. These schema include stress measurements, velocity rise times and arrival times, elastic sound speeds though the material and final compaction densities for a series of two different percent Theoretical Maximum Density (TMD) HMX sets of experimental data. There is a good agreement between the simulations and the experimental gas gun data with the largest source of error being an 11% overestimate of the peak stress which may be due to impedance mismatch on the experimental gauge interface. Determination of these P-α parameters are important as they enable modeling of porosity and are a vital first step in modeling of precursory hotspots, caused by hydrodynamic collapse of void regions or grain interactions, prior to deflagration to detonation transition of granular explosives.

Original languageEnglish (US)
Article number127121
JournalAIP Advances
Volume5
Issue number12
DOIs
StatePublished - Dec 1 2015

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HMX
gas guns
porosity
voids
deflagration
stress measurement
granular materials
detonation
traveling waves
arrivals
equations of state
hydrodynamics
impedance
acoustics
simulation
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Compaction of granular HMX : P-α porosity model in CTH hydrocode. / Mahon, K. S.; Lee, Taewoo.

In: AIP Advances, Vol. 5, No. 12, 127121, 01.12.2015.

Research output: Contribution to journalArticle

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