Z 向增强泡沫夹芯复合材料冲击损伤及冲击后压缩性能

基于热压罐成型工艺, 选择了树脂柱Z向增强泡沫芯材、碳纤维Z向增强泡沫芯材、Kevlar纤维缝纫增强泡沫芯材3种Z向增强复合材料结构, 对夹芯结构进行了低速冲击损伤和冲击后压缩(CAI)性能研究, 考察了不同Z向增强方式对冲击损伤面积和破坏模式的影响。结果表明, Z向增强对泡沫芯材产生了初始损伤, 其冲击后损伤面积大于未增强泡沫夹芯结构; 但Z向增强改变了夹芯结构的压缩破坏机制。通过选用合适的Z向增强材料和Z向增强参数, 能够提高夹芯结构的压缩强度和CAI强度。其中当增强材料为碳纤维, 增强参数为10 mm×10 mm时, 压缩强度提高了13%, CAI强度提高超过40%。

Impact damage characteristics and post-impact compressive properties of Z-reinforcement foam core sandwich composites

Resin column reinforced, carbon fiber prepreg bar reinforced and kevlar fiber stitched reinforced foam core sandwich composites were produced using the same face sheets based on the autoclave manufacturing technology. The prepared sandwich structures were tested under low-velocity impact and post-impact compressive. The post-impact damage characteristics and damage modes were also studied. The results indicate that initial damage of foam-core is caused by the Z-reinforcement, and the post-impact damage area increases compared with the unreinforced one’s, while the compressive failure mechanisms of foam core sandwich composites is changed by the Z-reinforcement. The compressive strength and the CAI strength can be improved by choosing the right Z-reinforcement material and parameter. They increase by 13% and more than 40% with carbon fiber prepreg bar reinforced at 10mm×10mm Z-reinforcement parameters.