Modeling the Sn Equation of State to Constrain the Liquid Vapor Dome

The off-Hugoniot expanded states of matter remain poorly understood for several materials of interest to the national defense and planetary impact communities. Predictive modeling of phase transformations remains limited—specifically in the onset of vaporization in Sn under high-pressure conditions. To address this gap, we have developed an equation of state (EOS) model using the analytical modeling software ANEOS, which uses current expanded states data to predict the location of the liquid-vapor equilibrium region. This has allowed for a more comprehensive understanding of the thermodynamic behavior of Sn. Our equation of state has also enabled us to investigate Sn response to impacts with different materials in the 2D hydrocode simulation software, PyKO. Our model will help to inform the design of future planar impact experiments on our single stage and two stage light gas guns in order to best constrain the Sn equation of state.