Modeling and simulation of JWL equation of state for reactive Al/PTFE mixture

An analytical method is presented to fit parameters of Jones-Wilkins-Lee (JWL) equation of state (EOS) for the chemical process of aluminum-polytetrafluoroethylene (Al/PTFE) mixture. Subroutine codes for both strength model and EOS were developed in explicit-FE code AUTODYN. Firstly, the shock Hugoniot data of reactive Al/PTFE mixture was analytically derived by implementing this methodology. The JWL EOS was verified to fit shock Hugoniot data of both reacted and unreacted Al/PTFE mixture, which gives reasonable results. Furthermore, to numerically ascertain the reaction phases of ignition and growth and quasi detonation of Al/PTFE mixture, characterized experiment was setup to validate the reaction phases and coefficients of JWL EOS for Al/PTFE mixture. From the test, a promising example of reactive mixture Al/PTFE is capable to enhance lethality of weapons, the status computation in clude quasi-detonation pressure and temperature of Al/PTFE mixture in different chemical reaction phases is validated.