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为研究三维编织复合材料的损伤容限性能,首先,利用同种纤维、基体和工艺分别制作了4种三维编织复合材料和1种层合复合材料;然后,进行了相同复合材料在不同冲击能量下的及不同复合材料在相同冲击能量下的低速冲击试验和冲击后压缩试验;最后,进行了冲击后的C扫描损伤检测,并对比了冲击后凹坑深度、损伤面积和损伤宽度。结果显示:层合复合材料的损伤形貌主要呈椭圆状,且分层损伤严重,而三维编织复合材料的损伤形貌主要呈十字状,三维编织复合材料的整体性较好;层合复合材料和三维编织复合材料冲击能量的拐点均出现在30J附近;三维编织复合材料的剩余压缩强度较高,其损伤容限性能优于层合复合材料。所得结论可为三维编织复合材料的工程应用提供指导。
In order to study the damage tolerance of three-dimensional braided composites, four kinds of three-dimensional braided composites and one kind of laminated composites were fabricated by the same kind of fiber, matrix and technology. Then, Under the same impact energy and under the same impact energy of the low-speed impact test and post-impact compression test; Finally, after the impact of C-scan damage detection, and compared after the pit depth, damage area and damage width. The results show that the morphology of the laminated composites is mainly oval and the delamination is serious. The three-dimensional braided composites have a cross-shaped morphology and the integrity of the three-dimensional braided composites is good. The laminated composites And the inflexion point of the impact energies of the three-dimensional braided composites all appear in the vicinity of 30J. The residual compressive strength of the three-dimensional braided composites is higher, and the damage tolerance performance is better than the laminated composites. The conclusion can provide guidance for the engineering application of 3D braided composites.