弹体直径对卵头弹垂直穿透铝靶影响研究

Influence of Ogive-nose Projectile Diameter on Normal Perforation of Aluminum Plates

利用显式非线性有限元分析程序LS-DYNA,对卵头弹垂直穿透AA5083-H116铝靶进行了数值模拟。建立了弹靶撞击的有限元模型,铝靶采用修正的Johnson-Cook本构方程,但不定义失效准则,通过在靶板上预置小孔的方式模拟穿甲时的扩孔过程,并利用已有实验数据对数值模型的有效性进行了验证。在保持弹的质量和弹头形状不变的条件下进行了参数研究,分析了弹体直径对弹道性能的影响和铝靶的等效抵抗应力。研究表明:预置小孔的方式能有效地模拟穿甲时的扩孔过程;随着弹体直径的增加,弹道极限呈线性关系增长。相关结论对弹靶的设计优化具有指导意义。

Numerical simulations of normal perforation of AA5083-H116 aluminum target by ogive-nose projectile are conducted with the explicit nonlinear finite element program LS-DYNA. Finite element models of the projectile impact are established,and the modified Johnson-Cook constitutive equation is used for the aluminum target. A pin-hole in the target is included to allow ductile hole enlargement,so a fracture criterion is not necessary. Some experimental data available in the literature are used to verify numerical simulations. Assuming the same projectile mass and nose shape,the influence of the projectile diameter on the perforation process and the effective resistance of the target have been analyzed. The study shows that presetting of a pin-hole in the target can effectively simulate the enlargement process of perforation; the ballistic limit increases linearly with the increase of projectile diameter. The conclusions are helpful for the projectile/target design and optimization.