摘要
本文采用X射线CT和三维数字图像处理与分析方法对C/SiC复合材料内部的微细观结构、损伤及其动态演化过程进行了表征,展示了X射线CT在认识C/SiC复合材料微细观结构和损伤机理等方面的优势,它不仅可以定性地在三维空间上揭示C/SiC复合材料内部碳纤维束、SiC基体和孔洞的三维形貌及其连通性,还可以定量地对每个个体的体积、表面积、厚度场等关键三维几何参数进行测量,获得孔洞、纤维束和SiC基体沿铺层厚度方向的变化规律;在不对试样进行破坏的情况下开展失效分析,在准确确定最终断裂位置的同时,对试样内部产生的微裂纹以及高温下发生的氧化行为进行表征。通过开展基于X射线CT原位观测的力学试验,可以对C/SiC复合材料试验件内部的损伤演化过程进行准确表征,为揭示其损伤和失效机理提供更加直接可靠的依据。
The microstructures,damages and damage evolutions in the bulk of C/SiC composite material are characterized by using X-ray CT and three-dimensional digital image processing and analysis method.The advantages of X-ray CT to understand the microstructures and damage mechanisms in C/SiC material are highlighted.The three-dimensional morphologies of carbon fiber bundles,SiC matrix and pores in the bulk of C/SiC composite material and their connectivity are revealed in three-dimension qualitatively.The key three-dimensional geometry parameters,such as the volume,surface area,thickness field for each object,are measured quantificationally,and the variations of pores,carbon fiber bundles and SiC matrix along the direction perpendicular to the laminates could also be obtained.The failure analysis could be performed in the case of undestroying the samples.The final fracture is identified accurately,and the microcracks and the oxidation behaviors under high temperature in the bulk samples are also characterized.The mechanical tests with X-ray CT in-situ observations allow characterizing the damage evolutions in the bulk of C/SiC composite material accurately,and thus help to reveal the damage and failure mechanisms.
作者
王龙
刘武刚
孔凡金
张跃平
原凯
WANG Long;LIU Wu-gang;KONG Fan-jin;ZHANG Yue-ping;YUAN Kai(Science and Technology on Reliability and Environmental Engineering Laboratory,Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)
出处
《复合材料科学与工程》
CAS
北大核心
2021年第6期72-76,112,共6页
Composites Science and Engineering
基金
装发部领域基金项目(61407200206)
重点实验室基金项目(XXXX2019601XXXX)
北京市科协青年人才托举工程。
关键词
X射线CT
C/SIC复合材料
微观结构
损伤
三维表征
X-ray CT
C/SiC composite material
microstructure
damage
three-dimensional characterization
