铝合金多层板靶板损伤形式及其微观组织分析

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。

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

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.