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Continuum equations are numerically integrated using a high-resolution method to characterize the thermomechanical response due to planar impact of initially stressfree granular solid having spatially varying bulk porosity. This response depends on strain history because the crushup stress necessary for inelastic compaction increases with initial solid volume fraction (φ 0 ). Emphasis is placed 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 (C 4 H 8 N 8 O 8 ). Heat fluxes near 586 MW/m 2 , 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 (φ 0 = 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.

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