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Needled C/SiC composites are lightweight and high-temperature resistant material, making them suitable for extreme environments such as aerospace applications. This paper conducted fatigue experiments and finite element analysis (FEA) on 2D needled C/SiC under high-temperature oxidative environments with varying cyclic stresses to predict fatigue life accurately. The thermo mechanical fatigue tests of two random loads and three cyclic loads were carried out, and the related finite element analysis work was carried out to explore the damage mechanism of 2D needled C/SiC. The results indicate that increasing mechanical loads at elevated temperatures drastically reduces the material’s fatigue strength. Fiber ablation dominates performance degradation, as microscopic cracks act as oxygen diffusion channels. Even under minimal stress, fatigue strength plummets once cracks form. Uncoated C/SiC specimens failed to withstand 100 long-cycle thermomechanical fatigue load blocks.

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Failure Mechanism and Life Model of C/SiC Under Thermal Mechanical Oxygen Coupling Environment

  • 会议论文

  • 发表日期：

    2026年

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  • Yinxuan Zhang,
  • Xiguang Gao,
  • Sheng Zhang,
  • Deguang Shang,
  • Rui Bao,
  • Sijun Xiong

摘要

Needled C/SiC composites are lightweight and high-temperature resistant material, making them suitable for extreme environments such as aerospace applications. This paper conducted fatigue experiments and finite element analysis (FEA) on 2D needled C/SiC under high-temperature oxidative environments with varying cyclic stresses to predict fatigue life accurately. The thermo mechanical fatigue tests of two random loads and three cyclic loads were carried out, and the related finite element analysis work was carried out to explore the damage mechanism of 2D needled C/SiC. The results indicate that increasing mechanical loads at elevated temperatures drastically reduces the material’s fatigue strength. Fiber ablation dominates performance degradation, as microscopic cracks act as oxygen diffusion channels. Even under minimal stress, fatigue strength plummets once cracks form. Uncoated C/SiC specimens failed to withstand 100 long-cycle thermomechanical fatigue load blocks.