In this study, a combined experimental, numerical and theoretical investigation is conducted on the penetration of semi-infinite 4340 steel targets by a homogeneous 93W rod and two types of jacketed rods with striking velocities of 0.9–3.3 km/s. The results show that the jacketed rods produced typical “co-erosion” damage at all test velocities, except for the 93W/1060Al jacketed rod, which switched from an early “bi-erosion” damage to later “co-erosion” damage at a striking velocity of 936 m/s. However, the homogeneous 93W rod always forms a large mushroom head during the penetration process. The damage mechanisms of these two types of jacketed rods differ for striking velocities of 0.9–2.0 km/s, but this difference gradually decreases with increased striking velocity. For velocities of 2.0–3.3 km/s, all three types of projectiles exhibit typical hydrodynamic penetration characteristics, and the damage mechanisms of the two types of jacketed rods are almost identical. For the same initial kinetic energy, the penetration performance of the jacketed rods is distinctly superior to that of the homogeneous 93W rods. Compared with jacket density, jacket strength shows a more significant influence on the damage mechanism and penetration performance of the jacketed rod. Finally, an existing theoretical prediction model of the penetration depth of jacketed rods on semi-infinite targets in the co-erosion mode is modified. It transpires that—in terms of penetration depth—the modified theoretical model is in good agreement with the experimental and numerical observations for 93W/TC4 and 93W/1060Al jacketed rods penetrating semi-infinite 4340 steel targets.

在这项研究中，对半无限 4340 钢靶材通过均质 93W 棒和两种类型的夹套棒以 0.9-3.3 km/s 的撞击速度进行穿透的综合实验、数值和理论研究。结果表明，夹套杆在所有测试速度下都产生了典型的“共腐蚀”损伤，除了 93W/1060Al 夹套杆，它从早期的“双腐蚀”损伤转变为后来的“共腐蚀”损伤打击速度为 936 m/s。但是，均质的93W棒在穿透过程中总是会形成一个大蘑菇头。这两种夹套棒的损伤机制在 0.9-2.0 km/s 的打击速度下有所不同，但随着打击速度的增加，这种差异逐渐减小。对于 2.0–3.3 km/s 的速度，三种类型的弹丸都表现出典型的流体动力穿透特性，两种类型的夹套杆的损坏机制几乎相同。对于相同的初始动能，夹套棒的穿透性能明显优于均质93W棒的穿透性能。与夹套密度相比，夹套强度对夹套杆的损伤机制和穿透性能的影响更为显着。最后，对现有的夹套杆穿透深度在共侵蚀模式下对半无限目标的理论预测模型进行了修正。