Abstract
By decoupling thermal equilibrium conditions in shock loaded porous materials, two regimes resulting in two-zone Hugoniot are revealed, specifically, a stable low-pressure regime characterized by achieving interphase temperature equilibrium and a metastable high-pressure regime. Porous materials, represented as two-phase mixtures, are analyzed with an analytically constructed Hugoniot employing a constant Gr\uneisen parameter of condensed phase. Results of the analysis agree well with experiments for various porous materials over a wide range of porosities, which confirms the consistency of this interpretation. The two-zone consideration discovers a limitation on the high-temperature states of solid materials accessible via the shock loading of porous materials and suggests that the two-phase nature of porous materials needs to be reflected in the use of Hugoniot data of powders when constructing equations of state for the corresponding condensed materials.
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