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摘要: 给出了预测厚金属靶在不同形状弹头弹丸大速度范围内打击下侵彻与穿透的简单分析方程。在方程的建立过程中,假定变形是局部化的、冲击能量仅由侵彻过程吸收,并进一步假定靶材料对弹丸的平均阻(压)力由两部分组成:一部分基于空穴膨胀理论由于靶材料弹-塑性变形所产生的准静态凝聚阻力;另一部分是考虑了速度效应后的动压力。推导出了预测靶侵彻深度和弹道极限的方程表达式,并与金属靶在不同形状弹头弹丸大速度范围内打击下侵彻与穿透的实验进行了比较。理论预测与实验结果吻合得很好。Abstract: Simple analytical equations are given in this paper to predict the penetration and perforation of thick metallic targets under normal impact by missiles with different nose shapes over a wide range of impact velocities. In the formulation, it is assumed that the deformations are localized and that the impact energy is dissipated only by penetration. It is further assumed that the mean pressure offered by the target materials to resist the missiles consists of two parts. The first is a cohesive quasi-static resistive pressure due to the elastic-plastic deformation of the target materials based upon a cavity expansion formula. The second is a dynamic resistive pressure defined as a velocity-dependent enhancement factor applied to the quasi-static resistance. Equations are derived for predicting the D. O. P. (Depth of Penetration) in the targets and the ballistic limits in the case of perforation. It transpires that the model predictions are in good agreement with experimental data for a wide range of metallic targets struck transversely by missiles with different nose shapes over a wide range of impact velocities.
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Key words:
- impact /
- penetration /
- perforation /
- metallic targets /
- missiles /
- ballistic limit
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