Theoretical models and influencing factor analysis for the temperature-dependent tensile strength of ceramic fibers and their unidirectional composites

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• 作者：Jiaxing Shao^a ; ^b ; Weiguo Li^a ; ^b ; ^{wgli@cqu.edu.cn} ; Yong Deng^b ; Jianzuo Ma^b ; Xianhe Zhang^b ; Peiji Geng^b ; Haibo Kou^b ; Liming Chen^b ; Xiaozhi Wu^c
• 关键词：Temperature-dependence ; Ceramic fibers ; Tensile strength ; Ceramic-matrix composites
• 刊名：Composite Structures
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：164
• 期：Complete
• 页码：23-31
• 全文大小：1256 K
• 卷排序：164

文摘

In this paper, two physics-based temperature-dependent strength models for ceramic fibers were presented based on a critical failure energy density theory. These models included the combined effects of temperature, phase composition and oxidation on ceramic fiber strength. Good agreement between the model predictions and the experimental results was obtained. Based on the above models and the Cao and Thouless’s theory, a new temperature-dependent strength model for unidirectional ceramic fibers reinforced ceramic-matrix composites was developed. The good agreement between the predicted results and the experimental data fully validates the reasonability of this model. Compared with the Cao and Thouless’s model, the model is more practical and convenient to predict the temperature-dependent tensile strengths of the composites. The influencing factor analysis for ceramic fibers and their unidirectional composites were systematically conducted. Some new findings regarding their temperature-dependent tensile strengths were provided for the first time.