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.
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