对二步法方型三维编织复合材料的三维五向结构进行了真实的描述与分析。在此基础上划分出边上、角上和内部单元体。通过对复合材料的横截面以及与试件表面成 4 5°的纵切面进行观察 ,确定出轴纱因受编织纱捆绑挤压产生的形变情况以及轴纱内纤维体积含量 The three-dimensional five-directional structure of two-step square three-dimensional braided composites was described and analyzed. On this basis, divided into edge, corner and internal unit body. By observing the cross section of the composite material and the longitudinal section of the specimen at a 45 ° angle, the deformation of the shaft yarn due to the bundling of the braided yarn and the fiber volume content in the shaft yarn were determined