采用应力比为0.1和0.5,频率为60和20 Hz的正弦波从室温至1 500℃,在10<'-4> Pa真空中对3D-C/SiC复合材料进行拉-拉疲劳实验;获得其在应力比0.1频率60 Hz条件下室温、1 100、1 300和1 500℃的疲劳曲线,以及应力比0.1频率20 Hz和应力比0.5频率20 Hz条件下1 500℃的疲劳曲线.结果表明,若取循环基数为10°周,应力比0.1频率60 Hz条件下,3D-C/SiC复合材料在室温、1 100、1 300和1 500℃的疲劳极限分别为235、350、285和240 MPa,约为其拉伸强度的87%、97%、94%和90%;疲劳极限与比例极限和拉伸强度随温度有相似的变化规律,即随温度升高而增加,在1 100℃达到最大值,尔后随温度增加而下降;但是s-N<,f>曲线的斜率的变化规律恰好与此相反.应力比的增加和频率的降低,均使复合材料1 500℃的疲劳极限有所减小.
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