Study on directional explosion venting characteristics of anti-explosion vessel with shear pin
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摘要: 为机载抗爆容器结构设计和工程应用提供研究基础,开展了带剪切销抗爆容器的定向泄压特性研究。利用LS-DYNA软件建立内爆载荷下带剪切销抗爆容器的数值模型,开展容器内爆试验获得了剪切销临界直径并验证了模型可靠性;通过分析爆炸流场分布、冲击波压力变化情况等阐明了抗爆容器内冲击波传播与载荷分布规律;通过改变TNT当量与剪切销直径分析并讨论了泄压过程中泄压盖的运动规律;建立了不同泄压盖质量下药量与剪切销直径间的函数关系,探究了剪切销的临界断裂问题。结果表明:100gTNT内爆试验得到剪切销临界直径为22mm, TNT爆炸后冲击波在容器内做往复式传播,约3.8ms时泄压盖冲出容器,5ms时容器底部残存压力约0.5MPa;容器底部超压峰值约144MPa,罐体与泄压盖交汇形成的角隅处超压峰值约149MPa,且罐体在角隅处产生应变增长效应,角隅处成为新的危险点。由于剪切销的变形断裂过程会影响泄压盖的运动规律,导致泄压盖速度曲线中出现下降段,剪切销直径越大下降段持续时间越长。泄压盖自身惯性和剪切销刚度是造成泄压过程中泄压盖速度产生波动的主要原因。TNT药量与剪切销临界直径关系呈正比,二者的线性关系不受泄压盖质量影响。
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关键词:
Abstract: Once an explosion accident occurs on a civil aviation aircraft, it will cause fatal damage to the aircraft structure. In order to provide a research basis for the structural design and engineering application of airborne anti-explosion vessel, the directional explosion venting characteristics of anti-explosion vessel with shear pin were studied. The structure system is mainly composed of cylindrical vessel, venting cover, shear pin and aluminum alloy panel. Firstly, the numerical model of anti-explosion vessel under implosion was established with LS-DYNA. The critical diameter of shear pin was obtained in the explosion tests and the reliability of the model was verified. Then, the propagation of shock wave and distribution of blast loading in the anti-explosion vessel were elucidated by analyzing the distribution of explosion flow field and changes in shock wave pressure. Meanwhile, the motion law of venting cover during the process of explosion venting was studied by varying the TNT charge mass and shear pin diameter. Finally, a functional relationship between the charge weight and shear pin diameter was established under different venting cover masses, to investigate the critical fracture issue of the shear pin. The results show that the critical diameter of the shear pin is determined to be 22mm through 100g TNT internal explosion tests. Following the TNT explosion, the shock wave propagates reciprocally in the vessel. At approximately 3.8ms, the venting cover is ejected from the vessel, while the residual pressure at the bottom of the vessel is approximately 0.5MPa by 5ms.-
Key words:
- Anti-explosion vessel /
- Explosion venting /
- Shear pin /
- Blast wave /
- Failure behaviour
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