采用应力比为0.1,频率为60Hz的正弦波在室温和1300℃,10-4Pa真空中对3D-C/SiC复合材料进行了拉-拉疲劳试验.同时用SEM分析了疲劳断口特征.结果表明:若取循环基数为106,1300℃疲劳极限为285MPa,约为抗拉强度的94%;室温疲劳极限为235MPa,约为抗拉强度的85%.1300℃疲劳断口的纤维拔出长度比室温短.疲劳损伤主要起源于纤维束编织交叉部位,随着疲劳循环次数的增加,纤维束周围基体的损伤也不断加剧.
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