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C/SiC复合材料紧固件拉-拉疲劳行为研究
袁建宇1,逄锦程1,王影1,谢国君1,韩露1
航天材料及工艺研究所,北京 100076
摘要:
为了研究C/SiC复合材料紧固件的拉-拉疲劳行为,在疲劳应力比为0.1、加载频率为10 Hz的条件下对不同应力水平的疲劳寿命进行统计。采用断口分析和金相分析方法对C/SiC复合材料螺钉疲劳破坏的细观机制进行了研究。结果表明:C/SiC复合材料螺钉拉-拉疲劳包含拉断疲劳及拉脱疲劳两种失效形式;基于双参数幂指数形式的寿命模型,两种失效形式的疲劳寿命经验公式相似;C/SiC复合材料螺钉的疲劳极限约为拉伸强度的65%~70%,若最大疲劳应力大于0.7σmax,其材料损伤随循环次数增多而明显增大。
关键词:  C/SiC复合材料  紧固件  疲劳行为  拉断  拉脱
DOI:10.12044/j.issn.1007-2330.2020.03.014
分类号:TB33
基金项目:
Tension-Tension Fatigue Behavior of C/SiC Composite Fasteners
YUAN Jianyu1, PANG Jincheng1, WANG Ying1, XIE Guojun1, HAN Lu1
Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
In order to investigate the tension-tension fatigue behavior of C/SiC composite fasteners,the fatigue life under different stress levels was obtained when the stress ratio was 0.1 and the loading frequency was 10 Hz. Using the fracture analysis and microstructure observation method,the meso-mechanism of fatigue failure of C/SiC composite fasteners was also analyzed.The results indicate that there are two types of failure modes for the tension-tension fatigue behavior including thread breaking and thread pulling off.An empirical two-parameter power exponent form of formula characterizing the fatigue life is proposed,and fatigue life for the two failure modes are similar.The fatigue limit for C/SiC composite fasteners is 65% to 70% of tensile strength,which means that if the maximum fatigue stress is more than 70% σmax,the damage of C/SiC composite material significantly increases with cyclic number.
Key words:  C/SiC composite material  Fasteners  Fatigue behavior  Thread breaking  Thread pulling off