Study on the influence of constraint conditions on the slow cook-off response characteristics of melting and casting explosives

Abstract

In order to study the slow cook-off test response characteristics of melt cast explosive and cast explosives under different constraint conditions, the heating characteristics, ignition characteristics and response law of melt cast B explosive and cast nitrate PBX explosive were studied by using self-designed slow cook-off test device when the ratio of discharge hole area to charge cross-section area Sh/Sc was 10%, 5% and 0%, respectively. The results show that in the slow cook-off process of two kinds of charge, the shell drain hole can effectively discharge gas or part of explosive before ignition. After ignition, the pressure can be released reliably, the increase of internal pressure in the shell can be restrained, and the intensity of response can be reduced; With the decrease of the size of the drain hole, the reaction intensity increases and the damage degree of the shell increases; When Sh /Sc =10, the combustion reaction takes place in both casting charge and casting charge; When Sh /Sc =5, the deflagration reaction occurs in the melt casting charge, which first burns and then deflagration reaction occurs in the casting charge; When Sh /Sc =0, the fusion charge and the casting charge have explosive reaction; Under the same constraint conditions, the safety of cast explosive is slightly higher than that of cast explosive.