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The influence of low velocity repeated impacts on residual compressive properties of honeycomb sandwich structures

机译：低速反复冲击对蜂窝夹层结构残余压缩性能的影响

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This paper describes the low velocity impact behavior of repeatedly impacted honeycomb sandwich structures which are used in aircraft interiors comprising of unidirectional glass fiber reinforced epoxy composite face sheets and aluminum honeycomb core. Impact energies, maximum loads and the permanent deflection of honeycomb sandwich structures were determined with instrumented drop weight impact test machine to evaluate the repeated impact performance and damage resistance. On the other hand, the preliminary single impact loading tests also performed in order to find the energy levels which were ranged fully elastic energy level to perforation energy level for sandwich composites. Impact test results obtained from repeatedly impacted honeycomb sandwich structures were correlated with a function of force-time, force-deflection and energy-number of impacts curves. This work is also focusing on the residual compressive properties of single and repeatedly impacted honeycomb sandwich structures. Shimadzu AG-X test machine with a load cell of 10 kN was used for compression after impact tests (CAI). The values of residual compressive strength of the single and repeatedly impacted honeycomb samples were compared with the undamaged honeycomb samples according to compressive load-displacement curves. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文描述了反复冲击的蜂窝状夹层结构的低速冲击性能，该结构用于飞机内部，包括单向玻璃纤维增​​强环氧复合材料面板和铝蜂窝芯。冲击能量，最大载荷和蜂窝状夹层结构的永久挠度用仪器化的落锤冲击试验机测定，以评估重复的冲击性能和抗破坏性。另一方面，还进行了初步的单次冲击载荷试验，以发现能级范围介于夹芯复合材料的完全弹性能级至射孔能级之间。从反复冲击的蜂窝夹层结构获得的冲击试验结果与冲击时间，冲击力和冲击次数的函数相关。这项工作还集中在单个和反复冲击的蜂窝夹层结构的残余压缩性能上。使用具有10 kN称重传感器的Shimadzu AG-X试验机进行冲击试验（CAI）后的压缩。根据压缩载荷-位移曲线，将单个和反复冲击的蜂窝样品的残余抗压强度值与未损坏的蜂窝样品进行了比较。 （C）2015 Elsevier Ltd.保留所有权利。

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