A freezing recovery method for metallic cylinder shells under internal explosive loading
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摘要: 针对内爆炸载荷下膨胀态金属柱壳的回收问题，设计了冻结回收试验方法，实现了起爆后不同时刻金属柱壳的冻结回收。基于一体式壳体提出了3种改进结构，并分别对4种柱壳结构在内爆载荷下的膨胀断裂过程进行数值模拟。结果表明，两段式结构最有利于减小非起爆端对预期回收中间段壳体的影响。根据选定的最优壳体结构和金属柱壳在起爆后不同时刻的膨胀外形特征，设计与之匹配的冻结回收装置并进行冻结回收试验。试验结果表明，设计的冻结回收试验方法可以实现膨胀态金属柱壳的回收，回收壳体的轴向和径向尺寸与设计理想值符合较好，整体误差可控制在10%以内。Abstract: Aimed to the recovery of expansive metal cylindrical shells subjected to internal explosive loading, the freezing recovery test method was developed to realize the freezing recovery of the metallic cylindrical shells at different moments after detonation. Based on the integrated shell, three improved structures were proposed, and the expansion and fracture processes of the four cylindrical shell structures under internal explosive loading were numerically simulated. It was found that the two-stage shell was the most beneficial to reduce the influence of the non-initiation end on the middle shell expected to be recovered. According to the selected optimal shell structure and the shape expansion characteristics of metal cylindrical shells at different moments after detonation, the freezing recovery devices matching with the shells were designed, and the freezing recovery tests were carried out. The test results show that the developed freezing recovery test method can realize the recovery of the expanded metallic cylindrical shells. The axial and radial dimensions of the recovery shells are in good agreement with the ideal design values, and the overall error can be controlled within 10%.
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图 2 一体式壳体的仿真计算模型（1～21为观测点）
Figure 2. The simulation calculation model for the integrated shell (1−21 are observed points)
图 3 起爆后30 μs时刻4种壳体的径向位移
Figure 3. Radial displacements of four shells at 30 μs after detonation
图 5 一体式壳体的膨胀变形响应压力云图
Figure 5. Variation of internal pressure of integrated shell with expansion and deformation process
图 6 匹配不同时刻壳体膨胀外形设计的冻结回收装置结构尺寸
Figure 6. Structural dimensions of designed freezing recovery devices matching deformation responses of shells at different times
图 7 3个回收时刻壳体径向变形响应
Figure 7. Radial deformation response of the shell at three recovery times
图 11 23 µs时刻的壳体冻结回收试验结果
Figure 11. Shell obtained from freezing recovery test at 23 μs
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