利用一种带排气缓释结构的烤燃装置,对热敏感的易熔金属及压力敏感的金属膜片在熔铸装药慢烤条件下的缓释过程进行了研究。结果表明,烤燃弹壳体预设的泄压孔可顺利排出炸药热分解产生的气体,减缓弹体内压力的升高,能降低装药的慢烤反应等级;采用易熔金属封堵泄压孔时,易熔金属在熔铸装药发生相变过程中逐步软化、破裂,形成泄压通道,缓释过程较为平缓;采用压力敏感膜片封堵泄压孔时,当弹体内压力增大至膜片破坏阈值时,膜片发生冲击剪切破裂,装药喷出,发生燃烧反应。

An exhaust process of heat-sensitive fusible metal and pressure-sensitive metal diaphragm under slow cook-off conditions of melt-cast explosive was studied by using a cook-off device with exhaust release structure. The results show that the preset venting hole can smoothly remove the gas generated by thermal decomposition, slow down the pressure increase in the bomb body, and effectively reduce the violent of the charge reaction; when the venting hole is sealed by the fusible metal, the fusible metal gradually softens and breaks during the phase change of the explosive, forming a pressure relief channel, and the exhaust process is relatively gentle; when the venting hole is sealed by the pressure sensitive diaphragm, the pressure inside the bomb increases to the diaphragm damage threshold, the diaphragm will undergo impact-shear failure, the explosive is ejected and the combustion reaction occurs.