Research on Thermal Protection Efficiency of Insensitive Ammunition Fuze for Slow Cook-Off Environment

In order to meet the operational efficiency requirements of ammunition, many countries attach great importance to avoid the serial explosion of ammunition caused by accidental thermal stimulation. Usually, the thermal conductivity of metal fuze shell is large, and the heat conduction speed is fast after being stimulated by ambient heat, which seriously endangers the safety of subsequent detonators and explosives. In order to study the heat barrier ability of fuze protective shell material and further enhance the thermal protection effect of fuze, a controllable burning system based on quartz lamp array is developed for simulating thermal environment stimulation, and a multi-channel temperature measurement micro-system embedded in fuze is designed and implemented, which is proved to have high reliability and multi-channel embedding testing ablity. The advantages of synchronous test are analyzed. By using the finite element thermal simulation technology, the influence of thermal protection layer on the thermal response of the booster under slow cookoff condition is analyzed. The protective shell material can effectively reduce the heat transfer. In addition, numerical comparisons of four kinds of protective materials (PTFE, Al-Mg fiber, ceramic insulating tile material (FRCI-12) and aerogel felt) under slow cook-off conditions show that the thermal protection effect of aerogel felt is the best.