不同升温速率下复合药柱烤燃实验与数值模拟研究

Cook-off test and numerical simulation for composite charge at different heating rates

为了研究不同升温速率下复合炸药JO-9159/JB-9014烤燃实验的热反应规律,建立了复合炸药的烤燃模型,利用有限元程序LS-DYNA3D对不同结构的复合药柱在烤燃过程中的热响应情况进行了数值模拟,并利用实验进行了验证,结果显示模拟结果可信。利用已建立的模型对5K/h、3K/min和10K/min等3种不同升温速率下复合药柱烤燃过程进行了数值模拟,结果表明:升温速率和装药结构的不同对复合药柱的点火时间和位置有较大影响,随着升温速率的增大,点火时间变短,点火位置由药柱的中心处逐渐移至药柱的两端边缘,升温速率较小时,复合药柱的热安定性取决于内部高能炸药的特性,升温速率较大时,复合药柱的热安定性与单一钝感药柱性能近似。因此,只有在较大的升温速率下,钝感炸药内部嵌入高能炸药才能既提高整体药柱的威力,又保证其具有较好的热安定性。

A cook-off simulation model for composite charge （interior JO-9159/exterior JB-9014） was established to investigate the characteristics of explosive thermal reaction at different heating rates. The thermal responses of the composite charges with different structures were calculated by the finite element program LS-DYNA3D. The simulation results were verified by the experiments. Based on the available model, the calculations were conducted to simulate the cook-off tests for the composite char- ges at heating rates of 5 K/h, 3 K/rain and 10 K/min. The results show that the heating rate and charge structure have great effect on the ignition time and position for the composite charge explosive. The ignition time decreases and the ignition position moves from the center to the two ends of the cyl- inder edge with the increase of the heating rate. The thermal stability depends on the interior high ex- plosive when the heating rate is relatively low. The thermal stability is similar to the single insensitive explosive when the heating rate is relatively high. Therefore, only at higher heating rate, this kind of composite charge structure can improve the explosive power and thermal stability.