航空科学技术2025，Vol.36Issue(4)：48-55,8.DOI:10.19452/j.issn1007-5453.2025.04.006
2.5D-SiCf/SiC复合材料结构的拉伸行为和损伤模型
Tensile Behavior and Damage Model of 2.5D-SiCf/SiC Composite Structures
摘要
Abstract
The mechanical properties of 2.5D-SiCf/SiC composites exhibit significant differences between the warp and weft directions.Investigating the relationship between their microstructure and tensile behavior is critical for understanding the anisotropic damage mechanisms and enhancing the application performance of these composites.In this paper,2.5D-SiCf/SiC composites were prepared using the chemical vapor infiltration method,and their microstructure and tensile properties were characterized.The results revealed the presence of a typical X-shaped pore network region within the material,where the warp yarns formed a 12°angle with the axial direction.During tensile loading,the warp yarns were subject to both tensile and shear stresses,reducing their damage tolerance.Consequently,the tensile damage degree at failure in the warp direction(53%)was lower than that in the weft direction(63%).This structural feature resulted in a warp fiber bundle volume fraction 2.52 times that of the weft fiber bundle,while the warp tensile strength(255.8MPa±5.5MPa)was only 1.64 times that of the weft(156.1MPa±29.9MPa).关键词
2.5D-SiCf/SiC/微结构/拉伸试验/损伤过程/损伤演化模型Key words
2.5D-SiCf/SiC/microstructure/tensile testing/damage process/damage evolution model引用本文复制引用
陈超,代睿,徐琳,范晓孟,赵东林,党潇琳,何江怡..2.5D-SiCf/SiC复合材料结构的拉伸行为和损伤模型[J].航空科学技术,2025,36(4):48-55,8.基金项目
航空科学基金(2019ZE053003) Aeronautical Science Foundation of China(2019ZE053003) （2019ZE053003）
