铝合金多层板靶板损伤形式及其微观组织分析

Study on damage failure pattern and microstructure analysis of target plate of laminated armor Al alloy

采用53式7.62 mm弹道枪、7.62 mm穿燃弹入射铝合金多层板,弹速为824 m/s。利用光学显微镜观察靶板侵彻后的弹坑微观组织。结果表明,距贯穿初始位置约4.3 mm开始出现绝热剪切带,距贯穿初始位置约3 mm开始出现裂纹。裂纹均存在于面板中。在弹丸冲击下,出现于面板弹坑微观组织中的绝热剪切带与裂纹相比,是一种更有效的能量耗散方式。背板贯穿处边缘未见裂纹和绝热剪切带。中间填料层对裂纹扩展有明显的抑制作用。

The plate of laminated armor Al alloy was shot by 7.62 mm ballisitic trajectory gun at 0°angle of attack with velocity around 824 m/s. The microstructure of the laminated armor Al alloy target plate was investigated with optical microscopy. The results showed that adiabatic shear bands were seen at a distance of 4.3 mm from entry along the penetration length. Cracks were also presented at a distance of 3 mm from entry along the penetration length. Cracks were all presented on face layer. Under impact, compared with cracking, adiabatic shear bands formation was a more efficient way of dissipating energy. Filling layer offered obviously resistance to crack propagation.