Penetration Behavior of 12.7 mm Projectile into Semi Infinite 45 Steel
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摘要: 针对刚性卵形短杆弹对半无限厚钢靶的侵彻行为，利用12.7 mm弹道枪进行不同着靶速度下12.7 mm穿燃弹正侵彻45钢的弹道试验，并结合数值模拟对侵彻过程中的弹丸侵彻行为进行分析。结果表明：12.7 mm穿燃弹对45钢的临界开坑速度为75 m/s，在弹速范围内弹芯表现出刚性侵彻行为，不同着靶速度下弹芯的侵彻阻力上升趋势基本一致，当着靶速度大于400 m/s时，在开坑结束后会出现常阻力阶段，直至侵彻结束。同时，制式弹对45钢的侵彻深度与着靶动能呈线性正比关系，通过拟合得到了无量纲侵彻深度与无量纲动能的关系式。
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关键词:
- 12.7 mm制式弹 /
- 刚性侵彻 /
- 侵彻阻力
Abstract: Aiming at the research on the penetration behavior of rigid oval short rod projectile to semi infinite thick steel target, the ballistic test of$\varnothing $ 12.7 mm projectile penetrating 45 steel at different landing speeds is carried out by using 12.7 mm ballistic gun. The penetration behavior of the projectile in the process of penetration is analyzed with numerical simulation. The results show that the critical cratering velocity of$ \varnothing $ 12.7 mm projectile to 45 steel is 75 m/s, and the core shows rigid penetration behavior in the range of projectile velocity. The increasing trend of penetration resistance of the core is basically the same under different impact velocities. When the impact velocity is greater than 400 m/s, there will be a constant resistance stage after the end of cratering until the end of the penetration. At the same time, the penetration depth of the standard projectile to 45 steel is linearly proportional to the target kinetic energy, and the relationship between the dimensionless penetration depth and the dimensionless kinetic energy is fitted.-
Key words:
- 12.7 mm standard projectile /
- rigid penetration /
- penetration resistance
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图 2 着靶速度和着靶动能与最终侵彻深度的关系
Figure 2. Relationships between impact velocity，kinetic energy and final penetration depth
图 3 807.1 m/s着靶速度下的弹芯、弹坑和弹靶耦合形态
Figure 3. Projectile core, crater and projectile-target coupling at the impact velocity of 807.1 m/s
图 4 原始弹芯和不同速度侵彻45钢靶后的弹芯头部
Figure 4. Original core and core heads after penetrating 45 steel target at different velocities
图 5 12.7 mm制式弹侵彻45钢靶的几何模型
Figure 5. Geometric model of 12.7 mm standard projectile penetrating a 45 steel target
图 6 弹芯材料的准静态压缩真应力-应变曲线
Figure 6. Quasi-static compressive true stress-strain curves of core material
图 9 最终侵彻深度与着靶速度及着靶动能的关系
Figure 9. Final penetration depth versus impact velocity and kinetic energy
图 10 开坑前弹芯动能密度损失与着靶速度的关系
Figure 10. Relationship between kinetic energy loss of core and impact velocity before pit opening
图 11 不同着靶速度下的弹芯阻力与弹芯位移的关系
Figure 11. Relationship between core resistance and core displacement at different impact velocities
图 13 无量纲侵彻深度与无量纲动能的关系
Figure 13. Relationship between dimensionless penetration depth and dimensionless kinetic energy
表 1 原始弹芯和侵彻后弹芯的质量和尺寸
Table 1. Mass and dimension of original and tested cores
No. Velocity/（m·s−1） Mass/g Length/mm Diameter/mm Mass loss rate/% 1(Initial core) 0 29.97 51.30 10.89 0 2 455.6 29.89 51.31 10.88 −0.27 3 618.0 29.86 51.27 10.90 −0.37 4 807.1 29.91 51.32 10.87 −0.20 
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表 2 铅套及燃烧剂的Plastic-Kinematic材料模型参数
Table 2. Plastic-Kinetic material model parameters of lead bushing and fuel
Material $\,\rho $/(g·cm–3) E/GPa $\nu $ ${\sigma { _\text{y} } }$/MPa Et/GPa Lead bushing 11.30 17 0.42 15.5 7 Fuel 1.80 17 0.42 15.5 7
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