复合材料科学与工程 ›› 2021, Vol. 0 ›› Issue (6): 72-76.DOI: 10.19936/j.cnki.2096-8000.20210628.011

• 应用研究 • 上一篇    下一篇

X射线CT在C/SiC复合材料微观结构和损伤表征中的应用

王龙, 刘武刚, 孔凡金, 张跃平, 原凯   

  1. 北京强度环境研究所 可靠性与环境工程技术重点实验室,北京 100076
  • 收稿日期:2020-09-23 出版日期:2021-06-28 发布日期:2021-08-03
  • 作者简介:王龙(1987-),男,博士,高级工程师,主要研究方向为航天器结构强度、实验固体力学、材料表征与损伤机理等,lwang@spacechina.com。
  • 基金资助:
    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

APPLICATION OF X-RAY CT TO CHARACTERIZE THE MICROSTRUCTURESAND DAMAGES IN C/SiC COMPOSITE MATERIAL

WANG Long, LIU Wu-gang, KONG Fan-jin, ZHANG Yue-ping, YUAN Kai   

  1. Science and Technology on Reliability and Environmental Engineering Laboratory,Beijing Institute of Structure and Environment Engineering, Beijing 100076, China
  • Received:2020-09-23 Online:2021-06-28 Published:2021-08-03

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。

关键词: X射线CT, C/SiC复合材料, 微观结构, 损伤, 三维表征

Abstract: 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.

Key words: X-ray CT; C/SiC composite material; microstructure; damage; three-dimensional characterization

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