Multiphase Equations of State for Structural Materials at High Pressures

Equations of state for materials over a wide range of pressures and temperatures are needed for numerical simulations of processes in shock-compressed media. Accuracy of calculation results is determined mainly by adequacy of equation of state of a medium. In this work, a new multiphase equation-of-state model is proposed with taking into account the polymorphic phase transformations, melting, evaporation and ionization. Thermodynamic calculations are carried out for metals, alkali halides, and polymer materials in a broad region of the phase diagram. Obtained results are presented in comparison with available data of experiments at high dynamic pressures in shock and release waves.