Monitoring experiment and simulation on solidification of DNAN based melt-cast explosive with FBG sensors,Propellants, Explosives, Pyrotechnics

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Monitoring experiment and simulation on solidification of DNAN based melt-cast explosive with FBG sensors
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2023-12-06 , DOI: 10.1002/prep.202300232
Junming Yuan ₁ , Hu Sun ₁ , Hongbo Sha ₁ , Fei Hu ₁ , Yue Qin ₁ , Yan Liu ₁ , Xingwang Cai ₁

Affiliation

In order to obtain the change rule of the temperature field and the mechanism of defect formation during the solidification process of melt-cast explosive, the temperature field change data were tested during the solidification process of DNAN based melt-cast explosive by using an arrayed spatially distributed Fiber Bragg Grating (FBG) temperature sensor device. The temperature field variation during the solidification experiment was obtained under the condition that the cooling rate of the boundary water-bath temperature was 0.2 °C/min. On the basis of the solidification experiments, the macroscopic solidification process of small-caliber grenade at different boundary cooling rates was simulated using ProCAST software. The simulation results show that when the boundary cooling rate is 0.2 °C/min, the temperature fields during the solidification process of DNAN based melt-cast explosive are in good agreement with that of the experimental monitoring points; the size of the melt-cast charge defects decreases as the boundary cooling rate becomes smaller; and the location of the charge defects is closer to the tail of the grenade as the cooling rate decreases. In addition, a mesoscopic model of DNAN based melt-cast explosive was established in the paper. At the mesoscopic level, the generation, formation, and evolution of charge defects in DNAN based melt-cast explosive during solidification were investigated. The study results provide theoretical guidance for the formulation design and process optimization of DNAN based melt-cast explosives, as well as for improving the charge quality of ammunition.

中文翻译：

FBG传感器DNAN基熔铸炸药凝固过程监测实验与模拟

为了获得熔铸炸药凝固过程中温度场的变化规律及缺陷形成机理，利用阵列空间阵列对DNAN基熔铸炸药凝固过程中的温度场变化数据进行了测试。分布式光纤布拉格光栅（FBG）温度传感器装置。获得了边界水浴温度冷却速率为0.2℃/min条件下凝固实验过程中的温度场变化。在凝固实验的基础上，利用ProCAST软件模拟了不同边界冷却速率下小口径手榴弹的宏观凝固过程。模拟结果表明，当边界冷却速率为0.2 ℃/min时，DNAN基熔铸炸药凝固过程中的温度场与实验监测点吻合较好；随着边界冷却速率变小，熔铸炉料缺陷尺寸减小；随着冷却速度的降低，装药缺陷的位置越来越靠近手榴弹的尾部。此外，本文还建立了DNAN基熔铸炸药的细观模型。在介观水平上，研究了 DNAN 基熔铸炸药在凝固过程中电荷缺陷的产生、形成和演化。研究结果为DNAN基熔铸炸药的配方设计和工艺优化以及提高弹药装药质量提供理论指导。

更新日期：2023-12-06

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