结构参数对CFRP蒙皮-铝蜂窝夹层板低速冲击性能的影响

针对碳纤维增强树脂复合材料（CFRP）蒙皮-铝蜂窝夹层结构，使用半球头式落锤冲击试验平台进行了低速冲击载荷下蜂窝芯单元尺寸对夹层板冲击性能影响的试验探究，并基于渐进损伤模型、内聚力模型和三维Hashin失效准则，在有限元仿真软件ABAQUS中建立了含蒙皮、蜂窝芯、胶层的CFRP蒙皮-铝蜂窝夹层板精细化低速冲击仿真模型，仿真结果与试验结果吻合较好。利用该数值模型进一步探究了蜂窝芯高度、蒙皮厚度和蜂窝芯壁厚等结构参数对于蜂窝夹层板低速冲击吸能效果的影响。结果表明:增大铝蜂窝芯的单元边长，会减小蜂窝夹层板的刚度，提升夹层板的吸能效果；芯层高度对夹层板的刚度及抗低速冲击性能影响较小；增大蜂窝夹层板的蒙皮厚度，可以提高夹层板的刚度，但会降低夹层板的吸能效果；增大蜂窝芯的壁厚，可以提高夹层板的刚度和抗低速冲击性能。 

Effect of structural parameters on the low-velocity impact performance of aluminum honeycomb sandwich plate with CFRP face sheets

The effect of the size of honeycomb core unit on the resistance of sandwich plate of carbon fiber reinforced polymer (CFRP) under low-velocity impact load was investigated by using the impact test system of hemisphere-head drop hammer. Based on the continuous damage mechanics model, cohesive element model and 3D Hashin damage criteria, a refined low-velocity impact simulation model for honeycomb sandwich plate with CFRP face sheets, aluminum honeycomb core and cohesive films was established in finite element simulation software ABAQUS. The simulation results are in good agreement with the experimental results. The effects of structural parameters, such as the height of honeycomb core, the thickness of face sheets and the thickness of honeycomb cell wall, on the energy absorption of honeycomb sandwich plate were further investigated by using the numerical model. The results show that increasing the cell side length of aluminum honeycomb core can reduce the stiffness of honeycomb sandwich plate and improve the energy absorption effect of sandwich plate. The core height has little effect on the stiffness and low-velocity impact resistance of the sandwich plate. Increasing the skin thickness of honeycomb sandwich board can improve the stiffness of sandwich board, but reduce the energy absorption effect of sandwich board. Increasing the cell wall thickness can improve the stiffness and low-velocity impact resistance of sandwich board.