蜂窝夹层复合材料修补结构低速抗冲击性能

Low-velocity impact resistance of repaired honeycomb sandwich composites

采用换芯挖补修理方法,对铝蜂窝夹层复合材料板进行单侧面层及蜂窝芯损伤的修理。对完整蜂窝夹层板和修理蜂窝夹层板进行落锤冲击实验,对比分析换芯挖补修理对蜂窝夹层板耐冲击性能的影响。采用X射线数字成像技术和宏观观察相结合的方法分析蜂窝夹层板在受到低速冲击时的损伤形式,研究其内部损伤规律,并对其冲击后剩余压缩性能进行表征。结果表明:完整蜂窝夹层板和修理蜂窝夹层板的损伤面积均随着冲击能量的增大而增大;相同的冲击能量下,完整蜂窝夹层板的损伤面积大于修理蜂窝夹层板的损伤面积;修理蜂窝夹层板的冲击载荷曲线类型较完整蜂窝夹层板发生了明显的变化,表现出较好的抗冲击性能,相同冲击能量下,修理蜂窝夹层板的CAI强度高于完整蜂窝夹层板;破坏机制包括冲击损伤破坏和压缩破坏的扩展,修理蜂窝夹层板蜂窝拼接区的抗冲击性能最好。

The honeycomb core replacement scarf repair method was used to repair the one side face-sheet and honeycomb core damage of aluminum honeycomb sandwich composite plate.The drop hammer impact tests were carried out on the intact honeycomb sandwich panel and the repaired honeycomb sandwich panel,and the influence of honeycomb core replacement scarf repair on the impact resistance properties was compared and analyzed.X-ray digital imaging technology and macroscopic observation were used to investigate the damage forms and internal failure mechanisms of composite repair structure under the low velocity impact.The residual compression property after impact was characterized.The results show that with the increase of impact energy,the damage areas of both intact and repaired honeycomb sandwich panels are increased,the damage area of intact honeycomb sandwich panel is larger than that of repaired ones under the same impact energy.The impact load curve type of repaired honeycomb sandwich panel is changed completely,and the repaired honeycomb sandwich panel shows better impact resistance.Under the same impact energy,the CAI strength of the repaired honeycomb sandwich panel is higher than that of the intact ones.The failure mechanism includes the expansion of impact damage and compression damage.The impact resistance of the honeycomb splicing area is the best.