Theoretical Study of Deflecting and Petalling of Thin Plate under Debris Cloud Loading Induced by Hypervelocity Impact
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摘要: 为研究多层板结构中薄板在碎片云作用下的变形与破坏问题，开展了超高速撞击多层板实验。实验结果表明，薄板在高速碎片云冲击下的典型破坏特征为中央穿孔及环孔凹陷变形与花瓣型撕裂。在此基础上，考虑弯矩和膜力作用，建立了描述薄板在轴对称分布强冲击载荷作用下大变形的理想刚塑性环板模型，据此可以计算环板变形过程的横向与径向速度场，结合Grady破碎理论，可以计算花瓣型撕裂的花瓣数，理论计算值与实验比较吻合。研究结果可以为多层板结构在超高速弹丸撞击下的毁伤评估提供理论基础。Abstract: In order to study the deformation and failure of the thin plate under impact of debris cloud in the multi-layer structure, a series of hypervelocity impact experiments on multi-layer structure are carried out. The experimental results showed that typical failure characteristics of the thin plate under impact of the high-speed debris cloud are central perforation, deflection and petalling. Considering the effect of bending moment and membrane force, an ideal rigid-plastic annular plate deflecting model is established, which can be used to describe large deflection of a thin plate under the strong axisymmetric impact load. The transverse and radial velocity fields of the thin plate under the strong axisymmetric impact load can also be calculated by the established ideal rigid-plastic annular plate deflecting model. With the Grady fragmentation theory, the number of petals can be calculated. The theoretical calculation result is consistent with the experiment. The research results can provide a basic theory for the damage assessment of the multilayer structure under the impact of hypervelocity projectiles.
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Key words:
- hypervelocity impact /
- debris cloud /
- dynamic deflection of annular plate /
- petalling
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图 1 弹丸超高速碰撞多层板结构
Figure 1. Multi-shock shield structure subjected to hypervelocity impact
图 6 挠度与径向关系示意图
Figure 6. Schematic of relationship between deflection and radial displacement
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