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Mesoscale analysis of volumetric and surface dissipation in granular explosive induced by uniaxial deformation waves

Content Provider	Springer Nature Link
Author	Panchadhara, R. Gonthier, K. A.
Copyright Year	2010
Abstract	A Lagrangian finite and discrete element technique, combined with a finite deformation, thermo-elastic-viscoplastic, and stick-slip friction theory, is used to computationally examine volumetric and surface dissipation within the meso-structure of granular explosive (HMX, C4H8N8O8) induced by uniaxial deformation waves. Emphasis is placed on characterizing the fraction of mass heated to elevated temperature (referred to as hot-spot mass fraction) by quasi-steady waves due to plastic and friction work and its dependence on wave strength. Predictions for a large, randomly packed ensemble of HMX particles having a solid volume fraction of 0.85 and a mean diameter of 60 μm show that plastic work principally affects the average temperature, whereas friction work affects the high frequency, high-temperature fluctuations that are likely responsible for combustion initiation. Cumulative distributions for hot-spot mass within the wave indicate that most mass (~99.9%) is heated to approximately 330, 400, and 500 K by plastic work for impact speeds of 50, 250, and 500 m/s, respectively, with a small fraction (~0.001%) heated to 600, 1,100, and 1,400 K by friction work. The hot-spot mass fraction induced by plastic work is well described by a Gamma distribution, though significant departures occur in the high-temperature end of the distribution due to friction work, even at higher impact speeds. Consequently, it is not possible to describe hot-spot mass fraction curves by a single classical distribution function. Implications of the predicted hot-spot mass fraction on granular HMX combustion are discussed.
Starting Page	43
Ending Page	61
Page Count	19
File Format	PDF
ISSN	09381287
Journal	Shock Waves
Volume Number	21
Issue Number	1
e-ISSN	14322153
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Compaction waves High explosives Hot-spots Mesoscale heating Condensed Matter Physics Acoustics Thermodynamics Engineering Fluid Dynamics Fluid- and Aerodynamics Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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