低硬度聚脲/钢板复合结构抗高速破片侵彻机理试验

针对低硬度聚脲/钢板复合结构的抗破片高速侵彻机理问题，通过弹道试验，分析了复合结构靶板的侵彻破坏模式和抗弹性能，并与相同面密度的纯钢板进行了比较. 从应力波的角度进一步探讨了复合结构靶板的抗弹机理，以及前聚脲层对后钢板层的影响机制. 结果表明，破片高速侵彻下，前聚脲层主要呈现剪切冲塞的破坏模式；而后钢板层的侵彻破坏模式则由无前聚脲层时的剪切冲塞，逐渐转变为花瓣开裂. 相同面密度情形下，虽然复合结构靶板的整体抗弹性能不如纯钢板，但由于前聚脲层的影响，后钢板层的抗弹效率会得到大幅提升；随前聚脲层/后钢板层面密度比值增大，复合结构靶板整体抗弹性能不是一直降低，而是先降低后提高，且后钢板层是主要耗能构件. 

Experiments on the Resistance Mechanism of Low-Hardness Polyurea/Steel Composite Structures Penetrated by High-Velocity Fragments

To explore the resistance mechanism of low-hardness polyurea/steel composite structures (PSCSs) penetrated by high-velocity fragments, ballistic tests were carried out. Failure modes and ballistic resistances of PSCSs were analyzed, and were compared with those of monolithic steel plates. On the basis of stress waves, ballistic resistance mechanisms of PSCSs were probed. Results show that the front polyurea layers mainly exhibit shearing plugging under high-velocity penetration by fragments, while the failure modes of rear steel layers change from shearing plugging to petalling. Under the same total areal density, the whole ballistic resistance of PSCSs is lower than that of monolithic steel plates, but the ballistic resistance efficiency of rear steel layers is promoted due to the influence of front polyurea layers. The whole ballistic resistance of PSCSs first decreases and then increases, instead of constantly decreasing, as the areal density ratio of front polyurea layer to rear steel layer increases. For a PSCS, the rear steel layer is its main energy absorption component.