Study on the detonation performance and specific impulse characteristics of a PETN-based ultra-thin sheet explosive
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摘要: 薄片炸药加载技术是实验室考核X射线辐照下空间结构动态响应的重要手段。为实现新型空间飞行器结构考核所需的超低比冲量化爆加载载荷,研制了以PETN为主炸药、以高聚物橡胶为黏结剂的超薄片炸药。薄片炸药的PETN质量分数为90%~92%,厚度范围为0.15~0.50 mm,密度范围为1.63~1.68 g/cm3,爆速范围为7.44~7.71 km/s。基于炸痕法的爆轰性能实验结果表明:厚度为0.15~0.50 mm的薄片炸药可由装药线密度为0.2 g/m的柔爆索可靠引爆,厚度为0.20~0.50 mm的炸药条均能可靠传爆。利用冲击摆测量装置对不同直径、不同厚度薄片炸药的比冲量特性进行了测试研究,结合理论分析,给出薄片炸药比冲量和厚度成正比,比例系数为3418.56 Pa?s/mm,成功实现了厚0.2 mm、约680 Pa?s超薄片炸药的研制。
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关键词:
Abstract: The sheet explosive loading technology is the main method to evaluate the dynamic response of the space structure under the X-ray radiation in laboratory. In order to realize the explosive loading with ultra-low specific impulse for structural examination of new space vehicles, the sheet explosive using PETN as the main explosive and polymer rubber as the binder has been developed. The mass fraction of PETN is 90% ~ 92%, the thickness range is 0.15~0.20 mm, the density range is 1.63~1.68 g/cm3 and the explosive velocity range is 7.44~7.71 km/s. In order to verify the high-impact initiation sensitivity of the sheet explosive, three rounds of verification experiments were designed based on the blast marketing method. In the experiment, the sheet explosive was directly applied to the effect plate or a certain air gap was reserved between the sheet explosive and the effect plate. By observing the explosive marks formed after the explosion on the effect plate, it is judged whether the explosive is detonated. The experimental results show that: the sheet explosive with thickness of 0.15~0.50 mm can be reliably detonated by the mild detonating fuse with a charge line density of 0.2g/m,-
Key words:
- ultra-thin sheet explosive /
- PETN /
- mild detonating fuse /
- detonation performance /
- specific impulse
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