Crack Closure Effect and Crack Growth Life Prediction for GH2036 Superalloy Plate

被引：0
|
作者：
Hu Dianyin [1 ,2 ,3 ]
Yang Qian [1 ]
Liu Huawei [4 ]
Wang Rongqiao [1 ,2 ,3 ]
机构：
[1] Beihang Univ, Beijing 100191, Peoples R China
[2] Collaborat Innovat Ctr Adv Aeroengine, Beijing 100191, Peoples R China
[3] Beijing Key Lab Aeroengine Struct & Strength, Beijing 100191, Peoples R China
[4] China Acad Space Technol, Overall Dept, Beijing 100094, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2017年 / 46卷 / 11期
关键词：
GH2036; superalloy; crack closure; residual crack tip opening displacement; fracture analysis; crack growth life prediction; LOW-CARBON STEEL; FATIGUE-CRACK; STRESS RATIO; SIZE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In order to examine the crack growth behavior of GH2036 supealloy subjected to low cycle fatigue (LCF) loading, crack growth experiments on GH2036 superalloy plates under different stress ratios at 550 degrees C were performed and the crack opening stress intensity factor of GH2036 superalloy were measured using Digital Image Correlation (DIC) technique. Results indicate that no crack closure is observed at 550 degrees C when the stress ratio is greater than 0.7. Meanwhile, crack closure model in GH2036 superalloy was established in terms of the residual crack tip opening displacement and stress ratio. In addition, SEM analysis of fracture reveals that with the increase of stress ratio, the fracture mode at the crack growth region changes from transgranular to intergranular. Finally, crack growth life of GH2036 superalloy under LCF loading is predicted using the established crack closure model in GH2036 superalloy plates. Low life scatter factor through model validation shows satisfactory results of the predicted crack growth life model.
引用
收藏
页码：3405 / 3409
页数：5
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