Monitoring the damage evolution of flexural fatigue in unidirectional carbon/carbon composites by electrical resistance change method

作者：Xue, Li-Zhen; Li, Ke-Zhi^*; Zhang, Shou-Yang; Li, He-Jun; Cheng, Jing; Luo, Wen-Fei

来源：International Journal of Fatigue, 2014, 68: 248-252.

DOI：10.1016/j.ijfatigue.2014.04.011

• Unidirectional C/C composites
• Flexural fatigue
• Electrical resistance change
• Damage evolution

This paper reported simultaneous monitoring damage evolution of flexural fatigue in unidirectional carbon-fiber-reinforced carbon composites (C/C composites) by electrical resistance change (ERC) methods. The degree of irregularity in electrical resistance changes increased with stress levels increasing. The shapes of electrical resistance change rate-fatigue cycle curves can reflect stress levels and damage types of tested samples: sawtooth shapes reflected delamination at a higher stress level; and "peak" shapes reflected inner damages in one fiber bundle at the fatigue limit stress level. In addition, the similarity of initial electrical resistance-fatigue life curve and S-N curve was observed clearly. In summary, ERC methods can monitor the damage evolution and qualitatively estimate the fatigue life of unidirectional C/C composites.

• 出版日期2014-11
• 单位西北工业大学