THERMODYNAMIC EQUATION OF STATE AND APPLICATION TO HUGONIOT PREDICTIONS FOR POROUS MATERIALS

A thermodynamic equation of state (EOS) is derived which is appropriat e for investigating the thermodynamic variations along isobaric paths. By using this EOS, a Hugoniot EOS model with a unified theoretical ba sis is proposed for predicting the shock compression behavior of porou s materials. The model is tested on 2024 aluminum, copper, and tungste n which are the typical materials with low, intermediate, and high sho ck impedance, respectively, and commonly used as standards. The calcul ated Hugoniots for these three materials with different initial densit ies are in good agreement with the corresponding experimental data pub lished previously. It shows that this Hugoniot EOS model can satisfact orily predict the Hugoniot of porous materials over a wide pressure ra nge. (C) 1996 American Institute of Physics.