材料期刊网

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30 J 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 investigate the damage tolerance properties of 3D braided composites,first,four kinds of 3D braided composites and one kind of laminate composite which were made by the same kind of fiber,matrix and tech-nology were fabricated respectively.Then,low velocity impact tests and compression after impact (CAI)tests of the same composite under different impact energies and different composites under the same impact energy were conduc-ted.Finally,the C-scan damage detection after impact was conducted,and the dent depth,damage area and damage length after impact were also contrasted.The results show that the damage morphology of laminate composites are mainly oval-shaped and the delamination damage is severe,while most of the damage morphologies of 3D braided composites are cross-shaped,and the integrity of 3D braided composites is better.The impact energy inflection points for the laminate composite and 3D braided composites both appear at about 30 J.The compression residual strength of 3D braided composites is higher,and the damage tolerance properties are better than those of laminate composites.The conclusions obtained can provide guidances for the engineering application of 3D braided compos-ites.