The reaction threshold of JOB-9003 explosive under low amplitude loading
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摘要: 发展了一种研究炸药反应阈值的实验方法和分析技术：采用火药炮发射飞片的加载技术产生低冲击加载压力，应用电磁粒子速度计测量JOB-9003炸药后界面与PMMA之间界面粒子速度。通过分析界面粒子速度曲线，得到了低冲击加载下炸药与PMMA之间的界面粒子速度历史，获得了入射压力与未反应和反应后的界面粒子速度之间的up-p关系。JOB-9003炸药在低冲击加载下的化学反应阈值和点火阈值分别为1.42、2.62 GPa。Abstract: A novel experimental technique to study the reaction threshold of explosives is developed. The flyer is accelerated to an expected velocity to gain a low amplitude loading by the gas gun. The interface particle velocity between JOB-9003 and PMMA under different stresses is measured with electromagnetic particle velocity gauges. The interface velocities of unreacting and reacting explosive are achieved based on the curve of the explosive interface particle velocity. The relationship ofup-p is achieved according to interface velocity of unreacting and reacting explosives. The chemical reaction threshold and the ignition threshold of JOB-9003 are 1.65 GPa and 2.62 GPa under the low amplitude loading.
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图 3 测量界面粒子速度结果与未反应炸药计算结果对比
Figure 3. Comparison of interface particle velocity of experiment and calculation
表 1 材料参数[12]
Table 1. material parameters
材料 c/(mm·μs-1) λ ρ/(g·cm-3) JOB-9003 2.49 2.09 1.84 PMMA 2.60 1.52 1.19 Al 5.25 1.39 2.78 不锈钢(0Cr18Ni9) 4.69 1.33 7.80 
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表 2 界面粒子速度随加载压力的变化情况
Table 2. Interface particle velocity of explosives vs. input pressure
实验 飞片 v/(m·s-1) p/GPa upn/(m·s-1) upr/(m·s-1) upc/(m·s-1) 备注 1 Al 320 1.28 152 152 153 未反应。取upr=upn。 2 Al 365 1.42 185 185 182 未反应。取upr=upn。 3 Al 450 1.75 235 305 235 慢反应。 4 Al 476 2.02 287 647 244 慢反应。 5 Al 524 2.26 319 788 273 慢反应。 6 Al 595 2.62 418 958 305 快速反应。 7 Al 624 2.78 455 1417 316 快速反应。 8 Steel 565 3.08 515 2280 335 爆炸。upn根据未反应实验点拟合得到。
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