摘要
作为一种耐高温高性能复合材料，Ｃ／Ｃ复合材料具优异的高温力学性能，但是材料本身的脆性是其弱点之一，其中，对于二维碳碳复合材料而言，层间裂纹扩展是其主要损伤机理，本文针对Ⅰ型和Ⅱ型层间裂纹扩展进行实验研究，深入分析了不同密度及加入填充剂填充的二维碳／碳复合材料的层间裂纹扩展方式，测试了Ⅰ型和Ⅱ型层间裂纹扩展能，发现裂纹扩展能随密度的增大而增大，加入石墨粉或热解炭粉可以有效提高材料的裂纹扩展能．
As a high performance thermal-resistant composites, carbon/carbon composites have the highest mechanical strength in the temperature more than 1600degreesC, but the brittleness of C/C is the main shortcoming limitting its usage. Delamination constitutes the principal threat to structure strength of two dimensional carbon/carbon composites. There are three kinds of crack extension modes in general. In this paper, two kinds of modes, that is, mode I and II were discussed. On the basis of failure evolution features in composites, the delamination crack extension energy G (I) (C), G(II) (C), the extension patterns and the influencing factors were researched. It is revealed that the critical interlaminar crack extension energy of 2D carbon/carbon increases as the material density goes up, therefore, the ability to resist fracture evolution improves. The experimental results show that the extension energy G (II) (C) rises with the increase of fiber volume fractions. Also, it is observed that the G(II) (C) increases greatly after filling the matrix with powdered pyrolytic carbon and graphite.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第1期91-95,共5页
Journal of Inorganic Materials
基金
国家自然科学基金(59882004)
国防预研基金(99J12.5.2
HK0311)
