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Effect of interface oxidation on matrix multi-cracking evolution of fiber-reinforced ceramic-matrix composites at elevated temperature
L. Li
College of Civil Aviation, Nanjing University of Aeronautics and Astronautics No.29 Yudao St., Nanjing 210016, PR China
received April 6, 2018, received in revised form May 1, 2018, accepted June 25, 2018
Vol. 9, No. 4, Pages 397-410 DOI: 10.4416/JCST2018-00032
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.
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Keywords
Ceramic-matrix composites (CMCs), matrix multi-cracking, interface oxidation
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