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借助用 5 3式 7.6 2 mm WO- 10 9C穿甲燃烧弹垂直撞击 10 mm厚、硬度为 HRC44～ 5 6的Cr- Ni- Mo装甲钢板的穿甲试验研究了高硬度及超高硬度状态下硬度对装甲钢板抗弹性能的影响。观察分析弹坑形貌发现 ,装甲钢板材料力学性能的改变导致了穿甲机理的变化。一方面 ,硬度升高 ,增加弹丸开坑所消耗的能量 ,提高弹丸消耗的塑性扩孔功 ,且当硬度超过一定值时 ,弹丸可能发生破碎 ,从而有利于抗弹性能的提高。另一方面 ,硬度升高 ,导致绝热剪切临界失稳应变降低 ,易诱发冲塞破坏 ,而且塑性与韧性降低 ,可能导致背面盘状崩落破坏 ,从而使抗弹性能下降。在本试验弹靶体系下 ,上述两方面相反作用的结果导致装甲钢板背面强度极限基本上不随硬度变化而改变。
Through the piercing test of a Cr-Ni-Mo armor steel plate with 10 mm thickness and hardness of HRC44-56, which was perpendicularly impacted by a 5 3 type 7.6 2 mm WO-10 9C armor-piercing combustion bomb, the effects of high hardness and ultra-high hardness Effect of Hardness on Ballistic Performance of Armored Steel. Observation and analysis of the crater morphology found that the change of the mechanical properties of the armor plate material led to the variation of the piercing mechanism. On the one hand, the hardness increases, increasing the energy consumed by the projectile kicking and increasing the plastic reaming work consumed by the projectile, and when the hardness exceeds a certain value, the projectile may be crushed, thereby being beneficial to improving the anti-projectile performance. On the other hand, the increase of hardness leads to the decrease of the critical instability strain of adiabatic shear, which is easy to cause the plug failure. Moreover, the plasticity and toughness decrease, which may lead to the disintegration of the discoid plate on the back surface and the decrease of the anti-ballistic performance. Under the test target system, the opposite effect of the two above-mentioned results resulted in that the strength limit of the back surface of armor steel plate basically did not change with the change of hardness.