Postdetonation Behavior of Condensed High Explosives by Modern Methods of Statistical Mechanics

摘要

An a priori theory of statistical mechanics was recently used to compute the thermodynamic properties of N sub 2 , O sub 2 , CO sub 2 , and H sub 2 O. In this paper, the a priori theory, together with the one-fluid van der Waals mixture model is used to compute postdetonation properties of three different high explosives - liquid NO, RX-23-AB, and hexanitrobenzene (HNB). The results show satisfactory agreement with the experimental Chapman-Jouguet (C-J) data and the C-J expansion adiabat deduced from the cylinder test data. By comparing the results with experimental data and with results obtained from the Jacobs-Cowperthwaite-Zwisler 3 (JCZ3) equation of state and the Becker-Kistiakowsky-Wilson (BKW) equation of state, it is demonstrated that the a priori theory is superior to the two semi-empirical models. The adiabatic gamma, -(par. delta lnP/par. delta lnV)/sub s/, predicted from the a priori theory decreases uniformly with the volume expansion. Analysis of the shock-wave data of liquid CO indicates that carbon atoms condense into a diamondlike structure rather than a graphitelike structure, as is assumed by current postdetonation models. (ERA citation 06:024113)