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Modeling the Effect of Oxidation on Tensile Strength of Carbon Fiber−Reinforced Ceramic−Matrix Composites

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Abstract

An analytical method has been developed to investigate the effect of oxidation on the tensile strength of carbon fiber − reinforced ceramic − matrix composites (CMCs). The Budiansky − Hutchinson − Evans shear − lag model was used to describe the micro stress field of the damaged composite considering fibers failure. The statistical matrix multicracking model and fracture mechanics interface debonding criterion were used to determine the matrix crack spacing and interface debonded length. The fiber strength degradation model and oxidation region propagation model have been adopted to analyze the oxidation effect on tensile strength of the composite, which is controlled by diffusion of oxygen gas through matrix cracks. Under tensile loading, the fibers failure probabilities were determined by combining oxidation model and fiber statistical failure model based on the assumption that fiber strength is subjected to two-parameter Weibull distribution and the loads carried by broken and intact fibers statisfy the global load sharing criterion. The composite can no longer support the applied load when the total loads supported by broken and intact fibers approach its maximum value. The conditions of a single matrix crack and matrix multicrackings for tensile strength considering oxidation time and temperature have been analyzed.

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Acknowledgments

The author thanks the Science and Technology Department of Jiangsu Province for the funding that made this research study possible

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Funding

This study has received the support from the Science and Technology Department of Jiangsu Province through the Natural Science Foundation of Jiangsu Province (Grant No. BK20140813).

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The author declares that he has no conflict of interest.

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  1. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No. 29, Yudao St, Nanjing, 210016, People’s Republic of China

    Li Longbiao

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Longbiao, L. Modeling the Effect of Oxidation on Tensile Strength of Carbon Fiber−Reinforced Ceramic−Matrix Composites. Appl Compos Mater 22, 921–943 (2015). https://doi.org/10.1007/s10443-015-9443-6

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