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Effect of interface oxidation on matrix multi-cracking evolution of fiber-reinforced ceramic-matrix composites at elevated temperature

L. Li

Journal of Ceramic Science and Technology, Vol. 9, No. 4 (2018), pp. 397-410

DOI: 10.4416/JCST2018-00032

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Abstract

In this paper, the effect of fiber/matrix interface oxidation on matrix multi-cracking evolution of fiber-reinforced ceramic-matrix composites (CMCs) is investigated using the critical matrix strain energy (CMSE) criterion. The shear-lag model combined with the fiber/matrix interface oxidation model and fiber/matrix interface debonding criterion is adopted to analyze the fiber and matrix axial stress distribution inside of the damaged composite. The relationships between matrix multi-cracking, fiber/matrix interface debonding and oxidation are established. The effects of fiber volume fraction, fiber/matrix interface shear stress, fiber/matrix interface debonded energy, oxidation temperature and oxidation time on the stress-dependent matrix multi-cracking development are discussed. Comparisons of matrix multi-cracking evolution with/without oxidation are analyzed. The experimental matrix multi-cracking development of unidirectional C/SiC, SiC/CAS, SiC/Borosilicate and mini-SiC/SiC composites with/without oxidation are predicted.

Keywords

Ceramic-matrix composites (CMCs), matrix multi-cracking, interface oxidation

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