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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。
The vertical elliptical AA5083-H116 aluminum target was simulated by an explicit nonlinear finite element program LS-DYNA. A finite element model of the impact of the projectile is established. The modified Johnson-Cook constitutive equation is adopted for the aluminum target. However, the failure criterion is not defined. The hole reaming process is simulated by presetting small holes in the target plate. The experimental data have been validated by the numerical model. The parameters of the projectile are studied under the condition of maintaining the mass and the shape of the projectile. The influence of the projectile diameter on ballistic performance and the equivalent resistance stress of the aluminum target are analyzed. The results show that the presetting of holes can effectively simulate the reaming process during piercing, and the ballistic limit increases linearly with the increase of the projectile diameter. The relevant conclusions are of guiding significance for the design optimization of missile targets.