  A thermodynamic equation of state (EOS) for thermoelectrons is derived which
is appropriate for investigating the thermodynamic variations along isobaric
paths. By using this EOS and the Wu-Jing (W-J) model, an extended Hugoniot EOS
model is developed which can predict the compression behavior of highly porous
materials. Theoretical relationships for the shock temperature, bulk sound
velocity, and the isentrope are developed. This method has the advantage of
being able to model the behavior of porous metals over the full range of
applicability of pressure and porosity, whereas methods proposed in the past
have been limited in their applicability.
