Predictions for the impact of a granular solid having spatially non-uniform bulk porosity

Document Type

Article

Publication Date

1-1-2007

Abstract

Continuum equations are numerically integrated using a high-resolution method to characterize the thermomechanical response due to planar impact of initially stress-free granular solid having spatially varying bulk porosity. This response depends on strain history because the crush-up stress necessary for inelastic compaction increases with initial solid volume fraction (φ0) on characterizing the influence of initial porosity and piston speed on both the grain surface heat flux variation and peak temperature rise within compaction wave profiles for the granular explosive HMX (C4H8N 8O8). Heat fluxes near 586 MW/m2, resulting in temperature rises in excess of 400 K, are predicted for weak compaction of granular HMX having an initially dense region adjacent to a highly porous region (φ0=0.99, 0.655). Phenomena associated with reflected and transmitted waves from material interfaces are highlighted. Predicted compaction zone end states and heat flux profiles are shown to agree well with those given by a steady-state theory. © Springer Verlag 2007.

Publication Source (Journal or Book title)

Computational Mechanics

First Page

419

Last Page

437

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