Abstract Three-dimensional carbon fiber (3D-CF) reinforced resin matrix composites are successfully prepared by vacuum impregnation and hot pressing process. The microstructure analysis shows that the resin distribution in the composites is uniform, the infiltration effect is satisfactory, and there are no obvious defects such as pores and delamination. The compression properties of the composites are tested in the directions which are perpendicular to the thickness of the fiber layer and parallel to the thickness of the fiber layer, respectively. The compressive strength of the composites are 374 MPa and 262 MPa, and the difference is obvious. The former is 42.7% higher than the latter. Further analysis of the compression failure behavior of the two composites shows that there is a significant difference in the failure forms. The former is mainly fiber layer crushing deformation, while the latter is mainly fiber layer fold and fracture failure. The latter is more destructive than the former, so its compression strength is lower than that of the former. It can be seen that the structure distribution and loading direction of fiber fabric have an important influence on the compressive strength of 3D-CF reinforced resin matrix composites.

中文翻译：

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3D-CF增强树脂基复合材料的制备及压缩破坏行为研究

摘要 采用真空浸渍和热压工艺成功制备了三维碳纤维（3D-CF）增强树脂基复合材料。微观结构分析表明，复合材料中树脂分布均匀，浸润效果满意，无明显的气孔、分层等缺陷。分别在垂直于纤维层厚度和平行于纤维层厚度的方向上测试复合材料的压缩性能。复合材料的抗压强度分别为374 MPa和262 MPa，差异明显。前者比后者高42.7%。对两种复合材料的压缩破坏行为的进一步分析表明，破坏形式存在显着差异。前者主要是纤维层压碎变形，后者主要是纤维层折叠断裂破坏。后者的破坏性比前者大，因此其抗压强度低于前者。可见，纤维织物的结构分布和加载方向对3D-CF增强树脂基复合材料的抗压强度有重要影响。