Multistage fatigue modeling of single-edge-notch tension specimens for Ni-based superalloy GH4169

被引：4
|
作者：
Wu, Z. R. [1 ]
Liu, F. L. [1 ]
Li, X. [1 ]
Fang, L. [1 ]
Song, Y. D. [1 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Jiangsu, Peoples R China
来源：
ADVANCES IN MECHANICAL ENGINEERING | 2017年 / 9卷 / 11期
关键词：
Multistage fatigue; small fatigue crack; long fatigue crack; life prediction; GH4169; CRACK-GROWTH; ALUMINUM-ALLOY; MECHANICS ANALYSIS; INITIATION; LIFE;
D O I：
10.1177/1687814017729948
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Multistage fatigue tests were conducted on the single-edge-notch tension specimens of Ni-based superalloy GH4169. Fatigue crack growth data at different stages were recorded with the surface replica technique. Continuum damage mechanics incorporating critical distance theory was used to evaluate fatigue crack initiation life. Then, small and long fatigue crack grow rates were modeled using Shyam's model and modified Paris law, respectively. Finally, the multistage fatigue model deriving from the above theories was proposed to predict total fatigue life of GH4169. Fatigue life prediction results show that the proposed multistage fatigue model has high accuracy for GH4169.
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页数：11
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