Energy Release and Fragmentation of Brittle Aluminum Reactive Material Cases,Propellants, Explosives, Pyrotechnics

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Energy Release and Fragmentation of Brittle Aluminum Reactive Material Cases
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-05-15 , DOI: 10.1002/prep.202100014
Jacob C. Kline ₁ , Brian P. Mason ₁ , Joseph P. Hooper ₁

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Cylindrical reactive material cases produced by the consolidation of an aluminum powder were tested via explosive launch in a closed chamber. One configuration measured the quasistatic overpressure generated by the case and explosive, and two further tests focused on soft-catch of fragments before and after striking the chamber walls. On a volumetric basis, the reactive material cases produced two to three times the combustion energy of an aluminum 6061 alloy case or a bare nitromethane explosive that was tested as comparisons. The metal combustion primarily occurs after case fragments impact the walls. Increasing the reactive material case thickness produces a higher pressure but lower combustion efficiency per unit mass, despite producing comparable or slightly more fine fragments on a per gram basis. Though the brittle, pressed aluminum cases have low toughness and tensile strength, recovered fragment patterns show a range of fragment sizes up to 1 mm, with approximately one-third of the mass below 100 μm.

中文翻译：

脆性铝反应材料壳的能量释放与碎裂

由铝粉固结制成的圆柱形反应材料外壳在密闭室中通过爆炸发射进行了测试。一种配置测量由外壳和炸药产生的准静态超压，另外两项测试侧重于在撞击腔壁之前和之后对碎片的软捕获。在体积的基础上，反应材料外壳产生的燃烧能量是铝 6061 合金外壳或作为比较测试的裸硝基甲烷炸药的两到三倍。金属燃烧主要发生在外壳碎片撞击壁后。增加反应材料外壳厚度会产生更高的压力，但每单位质量的燃烧效率会降低，尽管每克会产生相当或更细的碎片。虽然脆，

更新日期：2021-05-15

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