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基于电阻变化的3DC/SiC复合材料疲劳损伤演化

, PP. 165-169

Keywords: 3D,C/SiC复合材料,疲劳损伤,电阻,损伤演化,疲劳寿命

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Abstract:

为了研究三维碳纤维编织体增强碳化硅陶瓷基复合材料(3DC/SiC)在疲劳过程中的损伤演化并建立其电阻变化率(ΔR/R0)随疲劳周次变化的模型,对其进行了应力比为0.1、频率为20Hz、最大疲劳应力为250、255、260MPa的拉-拉疲劳试验,通过电阻增量仪器测量了连续3DC/SiC在疲劳中的电阻变化率。实验结果表明,ΔR/R0除首次循环降低外,随着疲劳周次的增加呈缓慢增加、台阶式增加和急剧增加3个阶段。根据损伤力学理论,以ΔR/R0为损伤参量,得到了ΔR/R0随疲劳周次变化的模型,该模型结果与实验结果吻合较好。

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