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设计了聚甲基丙烯酰亚胺(PMI)泡沫、交联聚氯乙烯(X-PVC)泡沫、NOMEX蜂窝、缝合PMI以及开槽PMI泡沫等形式的玻璃布面板夹层结构复合材料,研究了芯材种类和厚度、面板玻璃布层数以及缝合和开槽等因素对夹层结构低速冲击性能的影响。结果表明,PMI泡沫芯较X-PVC泡沫芯和NOMEX蜂窝芯具有更高的冲击破坏载荷和吸收能量。随着泡沫密度及面板厚度的增加,夹层结构复合材料的冲击破坏载荷和破坏吸收能量增大。合理的缝合和开槽,能够增加PMI泡沫夹层结构的强度、刚度及界面性能,提高冲击承载能力。
The composite materials of glass cloth sandwich panels, such as polymethacryl imide (PMI) foam, X-PVC foam, NOMEX honeycomb, stitched PMI and slotted PMI foam were designed. The type and thickness of the material, the glass cloth layer of the panel and the effects of stitching and grooving on the low-speed impact properties of the sandwich structure. The results show that PMI foam core has higher impact-breaking load and energy absorption than X-PVC foam core and NOMEX honeycomb core. With the increase of foam density and panel thickness, the impact damage load and failure energy absorption of the sandwich composite increase. Reasonable stitching and grooving can increase the strength, stiffness and interfacial properties of PMI foam sandwich structure and improve the impact load capacity.