夹层结构复合材料低速冲击试验与分析

Low-velocity impact experiment and analysis of sandwich structure composites

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 low-velocity impact tests on sandwich structures composed of glass cloth facesheet and different cores which are PMI foams,X-PVC foams,NOMEX honeycomb,stitched PMI foams and grooved PMI foams.The Influential factors,which include different kinds,different thickness of cores and facesheets and interfacial reinforcement techniques on stitching and grooving were studied.The test results show that PMI foam core has higher impact load and energy absorption than X-PVC foam core and NOMEX honeycomb.The impact damage load and energy of sandwich improve with the increase of thickness of facesheets and density of cores.Reasonable stitching and grooving can enhance the strength and rigidity of the sandwich structure,interface property and the resistance of impact.