中文摘要：

国内外关于动能弹侵彻的研究多集中在中低速范围,对高速特别是超高速侵彻的研究十分有限,其破坏特性还不清楚。采用LS-DYNA有限元程序和Steinberg本构模型,对着靶速度为1 300~4 500 m/s的钨合金动能弹侵彻钢靶问题进行了与实验相对应的数值研究,获得了不同着靶速度下侵彻深度、开坑直径、坑底压力、弹体形态及弹长消蚀的时空演化规律。结果表明：侵彻经历了瞬态高压、常压稳态侵彻、非稳态侵彻和回弹4个阶段;Steinberg本构模型特别适用于超高速侵彻的研究;当着靶速度大于4 000 m/s,着靶速度的变化对侵彻深度的影响可以忽略;超高速侵彻的瞬态高压达100 GPa以上,远大于弹体材料强度极限;相对于高速侵彻,弹体长度消蚀率更大,侵彻速度下降更快,侵彻时间更短。

英文摘要：

In the field of kinetic energy projectile penetration, most researches have been concentrated on the medium and low speed range, the high-speed （especially hypervelocity） study on penetration is very limited, and their destructive characteristic is unclear. The numerical simulation was performed by LS-DYNA finite element program and Steinberg constitutive model. Corre- sponding with the experiments, this paper simulated the tungsten alloy long-rod penetrating into the steel target at impact velocities from 1 300 to 4 500 m/s. The change rules of the penetration depth, diameter, bottom pressure, projectile shape and the erosion of projectile length with the different penetration time at various impact velocities were obtained. The results show that penetration has four stages, including a high voltage transients, atmospheric steady penetration, unsteady penetration and rebound; Steinberg consti- tutive model is particularly suitable for the study of hypervelocity penetration; when the presence speed is greater than 4 000 m/s, the impact of the speed on the penetration depth can be ignored; hypervelocity penetration of high voltage transients even reaches more than 100 GPa, much larger than the ultimate strength of the projectile material; in an hypervelocity penetration, length erodes faster, penetration speed declines faster, penetration time can be shorter.