A Family of Reference Hugoniots for Two-phase Porous Materials
DEFENCE SCIENCE AND TECHNOLOGY GROUP EDINBURGH (AUSTRALIA)
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Hugoniot states of heterogeneous materials obtained in shock experiments transit through various thermodynamic states that are not necessarily in equilibrium. Detailed numerical analysis employing a multi-phase constitutive material model has been conducted earlier which stressed the role of achieving equilibrium between the gaseous and condensed phases. The analysis also showed that the abnormal response of highly porous materials is closely associated with the attainment of the inter-phase equilibrium of both pressure and temperature. Mie-Grueneisen equations of state with the Murnaghan cold compression term were used earlier in the numerical analysis to illustrate the abnormal response. The present work shows that very simple equations of state for the phases are sufficient to describe the abnormality with the key necessary consideration a two-phase description of porous materials.
- Metallurgy and Metallography
- Numerical Mathematics