Instantaneous Void between Thermo-Baric Charge and Warhead Shell under Launching

The safety theory on the warhead under launching is a interesting subject in the weapon science. The stress state in the charge medium of a warhead under launching is a key question to be studied. It is very difficult to measure local stress in a warhead under launching. There have not been any better measurement technique and results until now. We investigated the dynamical response of the charge medium in a warhead under launching by numeral simulation and mechanical analysis. This work became a theoretic base for the use of thermo-baric warhead. The obtained results show that the stress states in charge medium in the low and middle parts are pressurized mostly in the launching history. The instantaneous void will appear between the top end of charge and the shell of warhead. This is because the stress wave velocity in the shell is larger than that in the thermo-baric charge medium. This instantaneous void may be a risk for explosion of charged thermo-baric explosive in a warhead under launching.