Constitutive Modelling of the Shock Behaviour of a Highly Porous Material

摘要

The report studies the constitutive behaviour of highly porous materials. This study is driven by efforts for the development and validation of a multi-phase modelling capability in DSTO, which aims at an enhanced evaluation of blast mitigation by porous materials. A two-phase model is employed for the description of a porous material, for which experimental shock velocity data are widely available in literature. The method deriving Hugoniots from the shock velocity data is critically approached. The importance of the non-equilibrium behaviour analysis is demonstrated, and it is shown that the stress or velocity profiles need to be considered, using relevant experiments% and constitutive modelling. It is argued that the apparent anomalous behaviour of the Hugoniots of a highly porous material might be caused by misinterpretation of the experimental data.