In this study, various structural configurations such plain core, two-core, epoxy columns in the core, core stitched, and facesheet stitched were designed in the foam core sandwich composite with the aim to increase the absorbed energy and to decrease core/facesheet debonding area due to low-velocity impact. Glass fiber/epoxy and PVC foam were used as a facesheet material and a core material, respectively. The impact energy values were selected considering to penetration and perforation cases. The core stitching effect on low velocity impact behavior of sandwich composites were compared to facesheet stitching and it has been determined that the core stitching process can be an alternative to the facesheet stitching process in terms of the absorbed energy value. Impacted sandwich composites are investigated for core/facesheet debonding; the modifications through the thickness increased the failure path for core/facesheet debonding initiation and the results show that a significant decrease in the core/facesheet debonding area has been achieved.

在这项研究中，在泡沫芯夹层复合材料中设计了各种结构配置，如普通芯、双芯、芯中的环氧树脂柱、芯缝合和面板缝合，旨在增加吸收能量并减少芯/面板脱粘受低速撞击影响的区域。玻璃纤维/环氧树脂和 PVC 泡沫分别用作面板材料和芯材。冲击能量值的选择考虑了穿透和穿孔情况。将芯缝合对夹层复合材料的低速冲击行为的影响与面板缝合进行了比较，并且已经确定芯缝合工艺在吸收能量值方面可以替代面板缝合工艺。研究了冲击夹层复合材料的芯/面板剥离；