不同头形刚性弹丸侵彻钢靶力学行为

采用Autodyn-3D平台对不同头部刚性弹丸侵彻钢靶动力学过程进行了数值模拟研究。结果表明，头部形状对弹丸贯穿钢靶力学行为和破坏模式有显著影响，平头弹丸贯穿钢板主要表现为先产生绝热剪切带，后演变为冲塞贯穿破坏，冲塞厚度随着速增大而减小；半球形弹丸贯穿钢板主要表现为缩颈断裂及扩孔破坏，缩颈造成的塞块尺寸随着速下降而减小；锥形弹丸贯穿钢板主要表现为先经压缩和扩孔，最终造成靶板花瓣式穿孔破坏。 

Dynamic Behavior of Non-Deformable Projectiles with Different Nose Shape Penetrating Steel Plate

Dynamic behavior of non-deformable projectiles with different nose shapes penetrating steel plate was simulated by Autodyn-3D finite element code. The numerical simulation results show that projectile''s nose shape significantly affects the penetration behavior and failure mode of steel plate. When penetrating the steel plate by a blunt nose shape projectile, the typical dynamic behavior appears an adiabatic shear band formation and propagation initially, then inducing a plug ejection finally, with a thickening plug while increasing the impact velocity. For a hemispherical projectile penetrating, the steel plate shows a typical dynamic behavior of necking close and enlarging hole, and the size of the plug induced by necking close decrease with the impact velocity decrease. As penetrated the steel plate by a conical projectile, a typical dynamic behavior of permanent radial compressive and enlarging hole is produced, then resulting in a petal perforation finally.