弹头形状对刚性动能弹丸垂直穿透钢板的影响

Influences of Projectile Nose Shape on the Normal Perforation of Steel Plates by Rigid Projectiles

为了研究弹头形状对穿甲性能的影响,对直径20mm的刚性动能弹丸垂直穿透12mm厚度的Weldox 460E钢板进行了数值模拟。保持弹丸的质量和直径不变,锥头弹丸的锥角θ变化范围为10°~180°,卵头弹丸的曲径比ψ变化范围为0.5~4.0,考虑摩擦效应,研究了177~500m/s速度范围内弹头形状的变化对靶板弹道性能与破坏模式的影响。研究结果表明:锥头弹丸的锥角变化对靶板的弹道极限速度有明显影响,当锥角增加到大于临界锥角时,靶板的破坏模式从延性扩孔破坏转变为冲塞破坏;ψ≥3.0时,卵头弹丸的曲径比变化对靶板的弹道极限速度有明显影响,ψ≥1.0时,靶板的破坏模式均为延性扩孔破坏;弹头的尖锐程度越大,摩擦效应的影响越大。

Numerical simulations were carried out to study the perforation of 12 mm thick Weldox 460 E steel targets subjected to impact by 20 mm diameter rigid projectiles.Assuming the same mass,the cone angle of the conical-nosed projectile varied ranging from 10°to 180°and the caliber radius head of the ogive-nosed projectile varied from 0.5to 4.0.The analysis was focused on the influence of the projectile nose shape on the ballistic limit and the failure mechanism,with the effect of the friction between the projectile and the target also taken into consideration.The results show that the cone angle of the conical-nosed projectile exerts significant effect on the ballistic limit.An increase in the projectile cone angle changes the failure mechanism of the target from ductile hole enlargement to shearing plugging.The caliber radius head of the ogive-nosed projectile exerts significant effect on the ballistic limit for ψ≥3.0,and the plate is perforated through the ductile hole enlargement mechanism withψ≥1.0.The influence of the friction increases with the increase of the sharpness of the projectile nose.