Abstract In this paper, the temperature-dependent proportional limit stress (PLS) of SiC/SiC fiber-reinforced ceramic-matrix composites (CMCs) is investigated using the micromechanical approach. The PLS of SiC/SiC is predicted using an energy balance approach considering the effect of environment temperature. The relation between the environment temperature, PLS, and composite damage state is established. The effects of the fiber volume, interface properties, and matrix properties on the temperature-dependent PLS and composite damage state of SiC/SiC composite are analyzed. The experimental PLS and interface debonding length of 2D SiC/SiC composites with the PyC and BN interphase at elevated temperatures are predicted. The temperature-dependent PLS of SiC/SiC composite increases with the fiber volume, interface shear stress and interface debonding energy, and the matrix fracture energy and decreases with the interface frictional coefficient at the same temperature.

中文翻译：

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SiC/SiC纤维增强陶瓷基复合材料的温度相关比例极限应力

摘要 在本文中，使用微机械方法研究了 SiC/SiC 纤维增强陶瓷基复合材料 (CMC) 的温度相关比例极限应力 (PLS)。考虑环境温度的影响，使用能量平衡方法预测 SiC/SiC 的 PLS。建立了环境温度、PLS 和复合材料损伤状态之间的关系。分析了纤维体积、界面特性和基体特性对SiC/SiC复合材料随温度变化的PLS和复合材料损伤状态的影响。预测了在高温下具有 PyC 和 BN 界面的 2D SiC/SiC 复合材料的实验 PLS 和界面脱粘长度。SiC/SiC 复合材料的温度相关 PLS 随着纤维体积的增加而增加，