为了提高弹箭武器的可靠性,必须对其在一定热条件下的安全性进行评估。文中针对研究含能材料热安定性的烤燃试验,建立了烤燃弹的数值计算模型,利用LS-DYNA3D有限元程序中的热力耦合分析功能对烤燃弹在不同升温速率下的内部传热及炸药和壳体热膨胀的准静态过程进行了数值模拟,得到了炸药的点火时间、点火温度、点火位置以及炸药点火前壳体及炸药热膨胀的幅度、烤燃弹中的压力分布、等效应力及等效应变云图。结果表明,随着升温速率的提高,炸药的点火时间是逐渐缩短的,点火时壳体的温度是逐渐上升的;炸药的点火位置同时也是点火前装置中压力的最高点,装置中等效应力和等效应变的最大值出现在炸药中,与壳体相邻的圆柱环形区域。

The safety of missile under thermal condition should be evaluated for improving the reliability of the weapon. Aiming at the cook-off test for the research of the thermal stability of energetic materials, the calculating model was established. The heat transfer process and the quasi-static response of the cook-off bomb were simulated by means of thermodynamic coupling of LS-DYNA, an explicit finite element code. The ignition time, ignition temperature and the location of the ignition were determined. The thermal expansion of the cook-off bomb, the pressure distribution, the contours of the Von Mises effective stress and the effective stain were obtained. The result shows that the time consumed by ignition is deceasing with the increasing of the calefactive rate, while the temperature of the confinement is increasing with that. The pressure of the ignition location is also the high pressure location of the bomb. The maximum value of the effective stress and the effective stain are all in the cylindrical annular location of the explosive, where adjacent to the confinement.