Abstract In this study, the description of energy absorption capacity in different deformation modes in the perforation of thin metallic aluminum 1100-H12 targets is presented. The targets were impacted with 19 mm diameter hard steel cylindrical projectiles of varying nose profiles, viz. ogive, blunt, conical and hemispherical shape. Effect of oblique impact on the perforation behavior of 255 mm diameter circular plate targets was studied at 0 (normal), 15 and 30° angles from the incidence line. The ballistic performance of two different configurations of plate targets, viz. monolithic target of 2 mm thickness and in-contact double layered target of equivalent thickness (2 × 1 mm) was also investigated and compared. The numerical simulations were executed using Johnson-Cook elasto-viscoplastic material model for the targets in ABAQUS/Explicit solver and the results were corroborated with the experimental observations. The ballistic performance of the targets against different nose shaped projectiles, was evaluated and compared in terms of ballistic limit velocities, local and global deformations in the target, failure mechanisms and plastic work done in various deformation modes involved in the impact process. It was observed that the ballistic limit for all targets was increased with obliquity, except for targets impacted with blunt nose projectile. The energy absorbed in different deformation modes corroborated with the failure mechanisms involved in the target during perforation. Both target configurations showed the highest ballistic resistance for hemispherical nosed projectile.

中文翻译：

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弹道冲击下薄金属板靶行为的实验和数值研究

摘要 在本研究中，描述了薄金属铝 1100-H12 靶穿孔不同变形模式下的能量吸收能力。目标受到直径 19 毫米、具有不同机头轮廓的硬钢圆柱形射弹的撞击，即。卵形、钝形、圆锥形和半球形。在与入射线成 0（法向）、15° 和 30° 角时，研究了斜向冲击对 255 毫米直径圆形板靶穿孔行为的影响。两种不同配置的板靶的弹道性能，即。还研究和比较了 2 mm 厚的单片靶和等效厚度 (2 × 1 mm) 的接触式双层靶。数值模拟是在 ABAQUS/Explicit 求解器中使用 Johnson-Cook 弹-粘塑性材料模型对目标执行的，结果与实验观察结果相一致。根据弹道极限速度、目标的局部和全局变形、破坏机制和在冲击过程中涉及的各种变形模式下所做的塑性功，评估和比较了目标对抗不同鼻形射弹的弹道性能。据观察，所有目标的弹道限制都随着倾斜而增加，但被钝头弹丸撞击的目标除外。在不同变形模式中吸收的能量与射孔过程中靶标的失效机制相吻合。