A finite element axisymmetric model has been developed to study the energy absorption capacity of thin Aluminum plates (0.2–20 mm thickness) in terms of the ballistic limit. The Johnson-Cook material model was used to describe the mechanical behavior of the 2024-T3 Aluminum. Numerical results were validated by comparison with experimental tests carried on similar plates using a gas gun with two high-speed cameras to measure impact velocities in the order of 100 m/s to 200 m/s. Plastic work (60%) and friction (10%) dissipate the impact energy, while the remaining energy is absorbed in the plate as elastic and kinetic energy. A parametric analysis was performed for projectile radius and plate thickness to study their influence on the perforation energy. Ballistic curves and energy balances were used to obtain the ballistic limit from numerical simulations. Ballistic limit shows a non-linear relation with plate thickness to projectile diameter ratio, while the mean perforation stress shows a linear relation with plate thickness to projectile diameter ratio. From numerical results, a semi-empirical relation is suggested to estimate mean perforation stress and consequently obtain the ballistic limit for a given plate-projectile configuration.

已经开发了有限元轴对称模型，以研究弹道极限方面的薄铝板（0.2–20 mm厚度）的能量吸收能力。Johnson-Cook材料模型用于描述2024-T3铝的机械性能。通过与使用带有两个高速照相机的气枪测量在100 m / s至200 m / s左右的冲击速度的类似板上进行的实验测试进行比较，验证了数值结果。塑性功（60％）和摩擦力（10％）消散了冲击能量，而其余的能量则以弹性和动能的形式吸收在板中。对弹丸半径和板厚进行了参数分析，以研究其对射孔能量的影响。弹道曲线和能量平衡被用来从数值模拟中获得弹道极限。弹道极限与板厚与弹丸直径之比呈非线性关系，而平均射孔应力与板厚与弹丸直径之比呈线性关系。从数值结果来看，建议使用半经验关系来估计平均穿孔应力，从而获得给定板弹构造的弹道极限。