Modeling matrix multicracking development of fiber-reinforced ceramic-matrix composites considering fiber debonding |
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Authors: | Longbiao Li |
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Affiliation: | College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing, China |
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Abstract: | In this paper, the effect of fiber debonding on matrix multicracking development of different fiber-reinforced CMCs is investigated using the micromechanical approach. The Budiansky–Hutchinson–Evans shear-lag model is adopted to analyze the fiber and matrix stress distributions of the damaged composite. The fracture mechanics approach is used to determine the fiber/matrix interface debonding length. Combining the critical matrix strain energy criterion and fracture mechanics fiber/matrix interface debonding criterion, the stress-dependent matrix multicracking development is analyzed for different fiber volume fraction, fiber/matrix interface properties and matrix cracking characteristic stress. The experimental matrix multicracking development of unidirectional C/Si3N4, SiC/Si3N4, SiC/CAS, SiC/CAS-II, SiC/SiC, SiC/Borosilicate and mini-SiC/SiC composites are predicted. |
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Keywords: | ceramic-matrix composites (CMCs) interface debonding matrix multicracking |
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