摘要
为了研究二维C/SiC复合材料的疲劳行为并对其进行寿命预测,进行室温下二维C/SiC复合材料的拉伸试验和疲劳试验,并使用扫描电镜(SEM)观察其断口形貌。结果表明:C/SiC复合材料表现出类似金属的韧性断裂行为,疲劳极限约为极限拉伸强度(UTS)的85%,在室温下具有较为优良的抗疲劳性能;由于复合材料的缺口钝化效应,缺口试样的S-N曲线要高于光滑试样,但两者趋势一致,据此提出基于名义应力的疲劳寿命预测方法。
Monotonic tension tests and tensionktension fatigue tests combined with microscopic observation by scanning electron microscopy（SEM） are performed to investigate the fatigue behavior and life prediction of 2D C/SiC. The results show that C/SiC exhibits metal-similar ductile fracture behavior. The fatigue limit is about 85% of ultimate tensile strength（UTS）, which indicates that C/SiC has excellent fatigue performance under room temperature. The tendency of the S N curve of the notched specimen is consistent with the curve of the smooth specimen. But the curve of the notched specimen is higher than that of the smooth specimen, due to the notch insensitivity and notch blunted effect of composite materials. According to the test results, a fatigue pre- diction model based on the nominal stress is presented.
出处
《航空工程进展》
2014年第1期104-108,共5页
Advances in Aeronautical Science and Engineering
基金
国家自然科学基金(11072195)
关键词
疲劳
寿命预测
C
SIC
复合材料
扫描电镜
fatigue
life prediction
C/SiC
composite
scanning electron microscopy
