Study on JWL equation state of detonation Product based on the underwater explosion method

The equation of state for the detonation products of explosives is one of the foundations in explosion physics, and the JWL state equation were widely applied to study of various explosive properties. In order to obtain the equation state of explosive detonation products, in this paper, an underwater explosion method were used to study JWL equation state of detonation for RDX, the method were analyzed though the explosion bubble expansion process based on the conservation of energy, the energy include Es0 (Initial shock wave energy), Ept(Potential energy of water), Ec(The kinetic energy of water) and Er(energy loss by bubble expansion). And these energy were related to the change with underwater explosion bubble radius R-t and shock wave front Rs-t, which were got form the underwater explosion experiments. Based on the experiments result and using a similar processing experimental data method to cylindrical experiment, the function relationship of explosion bubble expansion radius R-t and variation of shock wave front position Rs-t were fitted, and the parameters of the JWL state equation of RDX explosive detonation products were got finally. Which compare with the parameters obtained from cylindrical experiments, it has a good agreement with underwater explosion bubble expansion bubble radius experiment result and bubble pulsation period got from the pool explosion experiment. This method provides a testing approach for the state equation of detonation products with low cost, few size limitations, and a wide pressure range.