装甲钢/UHPC复合靶体抗侵彻性能试验与数值模拟研究

装甲钢/超高性能混凝土（UHPC）复合防护结构在重点工程中抵抗弹体的高速侵彻作用具有广泛的应用前景。为评估该复合结构的抗侵彻性能，对两种复合靶体开展侵彻试验与数值模拟研究。首先，开展了12发30 mm口径30CrMnSiNi2A弹体372~646 m/s速度侵彻复合靶试验。随后通过一系列静动态力学性能试验标定装甲钢材料的本构模型参数，并建立三维有限元模型对上述试验开展数值模拟分析。通过对比试验和数值模拟得到的弹体侵彻深度、残余弹体长度和装甲钢板的失效模式，验证了装甲钢本构模型参数的可靠性。进一步基于弹道效益系数对复合靶抗侵彻性能进行了定量评估。最后，确定了不同装甲钢板厚度复合靶体的临界贯穿速度，并对弹体侵彻复合靶的弹、靶失效模式进行了讨论。

Experimental and numerical studies on penetration resistance of armor steel/UHPC composite targets

Armor steel/ultra-high performance concrete (UHPC) composite structures have a wide application prospect in the protective structures against the high-speed projectile penetration. Aiming to evaluate the penetration resistance of the composite targets, both field tests and numerical simulations were carried out on two types of armor steel/UHPC composite targets. Firstly, twelve 30mm-caliber 30CrMnSiNi2A steel projectile penetration tests on different armor steel/UHPC composite targets were conducted with the striking velocities varying from 372 m/s to 646 m/s. Compared to the UHPC target, the armor/UHPC composite targets present high penetration resistance and low areal density. The test results show that the penetration resistance of the NP500/UHPC composite target with an armor steel thickness of 5 mm can be increased by 35.7% compared to that of the NP450/UHPC composite target. Besides, a series of static and dynamic mechanical tests for armor steels were conducted to calibrate the parameters of the constitutive model. Then, 3D finite element models were established and the corresponding numerical simulations were carried out. The parameters of the constitutive model of the armor steel were validated by comparing the experimental penetration depth, residual projectile length and failure mode of the armor steel plate with the numerical results. Furthermore, the impact resistance of the armor steel/UHPC composite targets was discussed quantitatively via the ballistic efficiency factor. For the cases in this study, the composite target with 8mm thick NP500 armor steel exhibits the best ballistic performance. Finally, the critical perforation velocities of two types of armor steels with different thicknesses in the composite targets were determined. The failure modes of the projectile and target were further discussed. As the strength and hardness of the armor steel increase, the failure mode changes from shear plugging failure to ductile hole expansion failure.