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Modeling the effect of oxidation on fatigue life of carbon fiber-reinforced ceramic-matrix composites at elevated temperature

机译：模拟氧化对高温下碳纤维增强陶瓷基复合材料疲劳寿命的影响

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摘要

An analytical method has been developed to investigate the effect of oxidation on fatigue life of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperature under air. 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 interface shear stress and fiber strength degradation model and oxidation region propagation model have been adopted to analyze the fatigue and oxidation effects on fatigue life of the composite, which is controlled by interface frictional slip and diffusion of oxygen gas through matrix multicrackings. Under fatigue loading, the fibers failure probabilities were determined by combining the oxidation model, interface wear model and fiber statistical failure model based on the assumption that the fiber strength is subjected to two-parameter Weibull distribution and the loads carried by broken and intact fibers satisfy the global load sharing criterion. The fatigue life S-N curves of unidirectional, cross-ply and 2.5D C/SiC composites at 800 ℃ under air have been predicted.
机译：已经开发了一种分析方法，以研究在空气中高温下氧化对纤维增强陶瓷基复合材料（CMC）疲劳寿命的影响。使用Budiansky-Hutchinson-Evans剪切滞后模型来描述考虑纤维破坏的受损复合材料的微应力场。利用统计矩阵的多裂纹模型和断裂力学的界面剥离标准，确定了基质的裂纹间距和界面剥离长度。采用界面剪切应力和纤维强度退化模型以及氧化区域传播模型来分析复合材料的疲劳和氧化对复合材料疲劳寿命的影响，这是由界面摩擦滑移和氧气通过基体多裂隙的扩散来控制的。在疲劳载荷下，基于纤维强度受到两参数威布尔分布且断裂和完好的纤维所承受的载荷满足以下假设，将氧化模型，界面磨损模型和纤维统计失效模型相结合，确定纤维的失效概率。全局负载分担标准。预测了单向，交叉和2.5D C / SiC复合材料在空气中800℃下的疲劳寿命S-N曲线。

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