Numerical Research of Influence of Attack Angle on Thin Aluminum Alloy Plate Impacted by Ogival-Nosed Projectile
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摘要: 基于Johnson-Cook材料本构和失效准则，利用ABAQUS有限元软件，建立了卵形头弹正撞击2mm厚的2A12铝合金薄板模型。在模型及参数验证的基础上，研究了弹体攻角对弹靶撞击过程、弹体动能变化和靶板变形的影响，其中攻角范围为0°~60°。结果表明：靶板的动能在撞击过程中只有微弱增加，靶板的塑性变形是主要的耗能方式；弹体攻角的增加导致靶板的损伤面积先增大后保持不变，弹孔形状从圆形过渡为“L”形；弹体的剩余动能随弹体攻角的增加而降低，并在攻角大于45°后保持不变；靶板弹道极限随攻角的增加先增加后略有下降，在45°时最大。Abstract: Based on the Johnson-Cook material constitutive and failure criteria, we established the models of 2A12 thin aluminum alloy plates with a thickness of 2 mm impacted by ogival-nosed projectiles using the finite element software ABAQUS, and studied the influence of the attack angles (0°-60°) on the projectiles' impacting processes, energy change and the deformation of targets on the basis of the verification of the models and parameters.The results show that the kinetic energy of the targets slightly increase during the impact process, and the plastic deformation is the main form of energy dissipation; the increase of the attack angle causes the broken area of the target to increase at first and then remain unchanged, and the shape of the hole transits from circular to "L"-shaped; the residual kinetic energy of the projectiles decreases with the increase of the attack angle and remains stable after the attack angle reaches 45°;the ballistic limits of the targets increase first and then decrease slightly with the attack angle, reaching the maximum when the angle was 45°.
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Key words:
- ogival-nosed projectile /
- attack angle /
- ballistic limit /
- numerical simulation
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图 1 卵形头弹形状和几何尺寸(单位：mm)
Figure 1. Shape and geometry of ogival-nosedprojectile (unit: mm)
图 9 不同攻角下弹体撞击仿真图像
Figure 9. Simulation images of projectile impacting target with different attack angles
图 10 不同攻角下弹体的剩余动能
Figure 10. Residual kinetic energy of projectileswith different attack angles
Density/(kg·m-3) Poisson's ratio E/GPa cp/(J·kg-1·K-1) Tr/K Tm/K m χ 2 770 0.33 71.7 921 293 863 1.426 0.9 A/MPa σu/MPa εu A1/MPa t1 w C ${\dot \varepsilon } $0/s-1 400 635 0.125 5 288 0.071 3 0 0.001 1.11×10-3 D1 D2 D3 D4 D5 D6 Wcr/MPa 0.116 0.211 -2.172 0.012 -0.012 56 13.04 150 
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