Rate of Strength Decrease of Fiber‐Reinforced Ceramic‐Matrix Composites during Fatigue
Rate of Strength Decrease of Fiber‐Reinforced Ceramic‐Matrix Composites during Fatigue
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DOI：
10.1111/j.1151-2916.2000.tb01412.x
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发表时间：
2000-06
影响因子：
3.9
通讯作者：
B. F. Sørensen;J. Holmes;E. Vanswijgenhoven
中科院分区：
文献类型：
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作者：
B. F. Sørensen;J. Holmes;E. Vanswijgenhoven
对陶瓷基复合材料中强度控制疲劳损伤的演化速率进行了实验研究。单向碳化硅纤维增强钙铝硅酸钙基复合材料的拉伸试件在相似的加载历史下被循环到失效或预先选定的循环次数。预循环试件的剩余强度与未循环试件的残余强度相似。微观结构研究表明，循环破坏后的断口有一个中心区域，纤维拔出可以忽略不计。认为摩擦加热(由于界面滑动)是疲劳失效的原因。较高的界面温度被认为会导致形成较强的界面键，从而导致内脆。
An experimental investigation was performed to study the rate at which strength-controlling fatigue damage evolves in a ceramic-matrix composite. Tensile specimens of a unidirectional SiC-fiber-reinforced calcium aluminosilicate matrix composite were cycled to failure or to a preselected number of cycles under similar loading histories. The residual strength of the precycled specimens was found to be similar to that of virgin specimens. Microstructural investigations showed that the fracture surfaces of the specimens cycled to failure had a central region where fiber pullout was negligible. It is proposed that frictional heating (due to interfacial sliding) is the cause of fatigue failure. High interfacial temperatures are assumed to cause the formation of a strong interface bond, leading to internal embrittlement.