Abstract
A progressive oxidative damage model of C/SiC composites, which is based on the oxidation mechanism and mechanical model of C/SiC composites, is presented to simulate the damage process of C/SiC composite under stressed oxidation environments. Firstly, the oxidation failure time of fibers was calculated according to the fiber stress and the fiber strength decline rule under stressed oxidation environments. Secondly, the stress redistribution and crack propagation around fracture fibers were given by combining the fracture position of fibers with the mechanical model, and the crack propagation would cause more fibers to be oxidized. Thirdly, the progressive oxidative damage process of C/SiC composites under stressed oxidation environments was simulated by repeating the cyclic process of fiber oxidation fracture and crack propagation around the fracture fibers. Finally, through the progressive oxidative damage model, the stress-strain curves and fracture morphology of the unidirectional C/SiC composites after stressed oxidation were predicted. The simulation results were correlated well with the experimental results, in terms of stressed oxidation life, stress-strain curve and variation law of fracture morphology, which indicated the reliability of the model.
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Acknowledgements
This work was supported by the National Basic Research Program of China, the National Natural Science Foundation of China [grant number 51675266]; the Aeronautical Science Foundation of China [grant number 2014ZB52024]; the Postgraduate Research & Practice Innovation Program of Jiangsu Province [grant number KYCX18_0314]; the Foundation of graduate innovation base of Nanjing University of Aeronautics and Astronautics [grant number kfjj20190207 and kfjj20190206]; the Fundamental Research Funds for the Central Universities [grant numberNJ20160038]; and the Jiangsu Province Key Laboratory of Aerospace Power System [grant number CEPE2019004] are gratefully acknowledged.
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Ding, J., Sun, Z., Chen, X. et al. A Progressive Oxidative Damage Model of C/SiC Composites under Stressed Oxidation Environments. Appl Compos Mater 28, 1609–1629 (2021). https://doi.org/10.1007/s10443-020-09849-9
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DOI: https://doi.org/10.1007/s10443-020-09849-9