A new method in study of JWL form unreacted equation of state for solid explosives

摘要

The unreacted equation of state (EOS) of an explosive is important because it acts on the state of chemical reaction zone when considering the ZND theory to simulate the detonation of solid explosives. Usually, the unreacted equation of state is derived from the Hugoniot curve which is always assumed to be of the linear form : D=c_0+su, where c_0 and s are constants determined from experimental data. But some experimental data shows that shock velocity vs particle velocity relation is not the linear form. In this paper, we developed one method to study the JWL form unreacted equation of state. The isentrope curve equation is derived from the Hugoniot curve by using the nonlinear D~u relation. It is predicted that the method can help to modify the high pressure unreacted equation of state for some explosives which only have little low pressure linear form D～u relation experimental data.