Computational analysis of compaction wave dissipation in porous solid explosives

Document Type

Conference Proceeding

Publication Date

1-1-2013

Abstract

It remains unclear, even for idealized systems, how the microstructure of porous solid explosives (e.g., particle size, shape, and packing) affects dissipative heating within compaction waves that is important for the weak initiation of detonation. In this study, we perform meso-scale simulations to computationally examine how initial porosity influences dissipation rates within inert quasi-steady compaction wave profiles and compare predictions to a macro-scale compaction theory. The meso-scale model, which incorporates a hyperthermoelastic-viscoplastic and stick-slip friction constitutive theory, tracks the evolution of thermomechanical fields within individual particles that result from pore collapse by compaction waves. Effective wave profiles are obtained by averaging meso-scale fields over space and time. The macro-scale theory predicts the variation in effective thermomechanical fields during compaction due to an imbalance between the effective solid pressure and a configurational stress. Preliminary results indicate that increasing porosity decreases the dissipative work rate within waves but increases the integrated dissipative work across waves. Qualitative agreement exists between meso-scale predictions of effective wave profiles and those given by the macro-scale theory. © 2013 by the American Institute of Aeronautics and Astronautics, Inc.

Publication Source (Journal or Book title)

51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

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