Numerical Study on Ballistic Resistance of Metal Perforated Armor to Projectile Impact
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摘要: 采用数值模拟方法研究了高速弹体冲击下孔结构金属装甲的抗弹能力，系统讨论了弹体冲击速度、入射角、弹着点、孔径、孔间距等因素对抗弹能力的影响。结果表明，在弹道极限速度附近，随着弹体冲击速度的增加，弹着点效应逐渐变得不明显；弹体垂直入射不对称弹着点时会出现明显偏转，而倾斜入射时即使在对称弹着点上也会出现明显的偏转现象；当弹体入射角度大于45°时，弹体剩余速度和侵彻深度出现较明显的下降，当入射角度大于65°时，出现弹跳现象。Abstract: In this paper, we numerically studied the ballistic resistance of the metal perforated armor to the high-velocity projectile, and analyzed in detail the effects of various factors on its ballistic resistance, including the impact velocity, the oblique angle, the hitting location and the size of holes.The results showed that the effect of hitting position decreases with the increase of the impact velocity near the ballistic limit.Both the normal impact at the asymmetric hitting position and the oblique impact at the symmetric hitting position result in the projectile yaw.The residual velocity of the projectile and the penetration depth decrease dramatically as the oblique angle is larger than 45°, and furthermore, the ricochet appears as the oblique angle is larger than 65°.
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Key words:
- metallic perforated armor /
- high-velocity impact /
- penetration /
- perforation /
- ballistic limit
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图 5 不同弹着点的弹体速度时程曲线
Figure 5. Velocity-time curves of projectiles at different hitting positions
图 6 不同弹着点对应的剩余速度随入射速度的变化
Figure 6. Residual velocity vs. impact velocity of projectiles at different hitting positions
图 7 不同弹着点对应的侵彻深度随入射速度的变化
Figure 7. Penetration depth vs. impact velocityof projectiles at different hitting positions
图 8 弹体在侵彻弹着点Ⅱ和Ⅴ处的偏转角度
Figure 8. Yaw angles of projectiles at hitting positions Ⅱ and Ⅴ
图 9 不同孔洞尺寸及弹着点条件下弹体的速度时程曲线
Figure 9. Velocity-time curves of projectiles under different hole sizes and hitting positions conditions
图 10 弹体在不同孔洞尺寸基板上的侵彻深度
Figure 10. Penetration depth of basic plates with different hole sizes
图 11 不同尺寸配置下弹体的偏转角度
Figure 11. Yaw angles of projectiles under different hole sizes conditions
图 12 孔结构装甲板抗弹能力随入射角的变化
Figure 12. Changes of ballistic resistance of perforated plates with different impact angles
图 13 弹体以30°和60°侵彻孔结构装甲板后的失效模式
Figure 13. Failure modes of targets penetrated by projectile with impact angles of 30° and 60°
图 14 弹体以45°侵彻弹着点Ⅴ的失效模式
Figure 14. Failure modes of target penetrated by projectile at hitting position Ⅴ with impact angles of 45°
表 1 钨合金和Secure 500高强钢的模型参数[6, 12]
Table 1. Material model parameters for tungsten alloy and Secure 500 high hardness steel (HHS)[6, 12]
Material ρ/(g·cm-3) G/GPa A/MPa B/MPa n C m cp/(J·g-1·K-1) Tm/K T0/K ${{\dot \varepsilon }_0}$/s-1 D1 D2 D3 c/(m·s-1) D4 D5 S1 S2 S3 γ0 Tungsten alloy 17.70 160 631 1 258 0.092 0.014 0.94 0.134 1 723 293 1.0 0.0 0.04 0.63 4 029 0.0 0.0 1.237 0.0 0.0 1.54 Secure 500 HHS 7.85 80 1 200 1 580 0.175 0.004 1.00 0.450 1 800 300 0.000 1 0.1 0.4 -1.3 4 570 0.05 0.0 1.730 0.0 0.0 1.67 
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表 2 不同孔洞尺寸的孔结构装甲板
Table 2. Perforated plates with different hole sizes
Target Hole size d/mm s/mm s/d s/d1.25-1 10.80 13.50 1.25 s/d1.25-2 9.00 11.25 1.25 s/d1.50-1 9.00 13.50 1.50 s/d1.50-2 7.00 10.50 1.50 s/d2.00-1 6.75 13.50 2.00 s/d2.00-2 9.00 18.00 2.00 s/d2.50-1 5.40 13.50 2.50 s/d2.50-2 9.00 22.50 2.50
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