The impact resistance of single curvature semi-cylindrical shell targets of aluminum 1100-H12 was explored against hard steel cylindrical projectiles. Experimental as well as numerical investigations were carried out to observe the performance of shell targets against ogive, conical, blunt and hemispherical nosed projectiles. Effect of oblique impact was studied on the ballistic performance of the shell targets at 0 (normal), 15 and 30° obliquity. Further, the impact performance of 2 mm thick monolithic and in-contact layered targets of equivalent thickness was evaluated and compared. The projectiles were driven by a pneumatic air gun and the projectile flight path was captured with a high-speed camera. The experimental results obtained in terms of incidence and residual velocities, and deformation profile of the targets, were validated with the numerical analyses conducted in ABAQUS/Explicit solver. Johnson-Cook constitutive strength and damage material model was employed to simulate the deformation and damage evolution in the targets. The ballistic performance of both monolithic and layered targets impacted at oblique incidence, was compared in terms of ballistic limits, failure mechanisms, local and global plastic deformations and plastic strain energy absorbed in radial, circumferential, axial and shear deformation modes. The in-contact layered shell targets exhibited significantly higher impact resistance than the monolithic targets against all projectiles. Target configurations impacted at oblique incidence with conical and ogive nosed projectiles showed increase in global deformation, while, opposite behaviour was observed in case of blunt and hemispherical nosed projectiles. The plastic strain energy absorbed in various deformation modes correlated with the failure patterns observed in the target material during ballistic impact.

探索了铝1100-H12的单曲率半圆柱壳靶对硬钢圆柱弹丸的耐冲击性。进行了实验和数值研究，以观察弹壳目标对弓形，圆锥形，钝形和半球形鼻状射弹的性能。倾斜冲击的影响研究了在0（正常），15和30°倾斜时弹壳目标的弹道性能。此外，评估并比较了2mm厚的等效厚度的整体式和接触式分层靶材的冲击性能。弹丸由气动气枪驱动，弹丸飞行路径由高速摄像头捕获。通过在ABAQUS / Explicit求解器中进行的数值分析验证了在入射速度和残余速度以及目标变形轮廓方面获得的实验结果。采用Johnson-Cook的本构强度和损伤材料模型来模拟目标的变形和损伤演化。整体和分层目标的弹道性能都受到根据弹道极限，破坏机理，局部和整体塑性变形以及在径向，圆周，轴向和剪切变形模式下吸收的塑性应变能，对斜入射进行了比较。接触式分层壳靶对所有弹丸的抗冲击性均比整体靶高得多。锥形和钝鼻的射弹对斜向入射的目标构型显示整体变形增加，而钝性和半球形的鼻射弹则观察到相反的行为。在各种变形模式下吸收的塑性应变能与在弹道撞击过程中在目标材料中观察到的破坏模式相关。