An investigation of small fatigue crack behavior in titanium alloy TC4 under different stress levels

被引：6
作者：
Zhu, Lei [1 ]
Hu, Xuteng [1 ]
Jiang, Rong [1 ]
Song, Yingdong [1 ,2 ]
Qu, Shoudao [3 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Jiangsu Prov Key Lab Aerosp Power Syst, Nanjing, Jiangsu, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing, Jiangsu, Peoples R China
[3] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing, Jiangsu, Peoples R China
来源：
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING | 2019年 / 233卷 / 15期
关键词：
Small crack; crack growth; fatigue lifetimes; stress level; titanium alloy; GROWTH-BEHAVIOR; LIFE PREDICTION; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; MICROSTRUCTURE; PROPAGATION; INITIATION; RATIO; FRACTURE;
D O I：
10.1177/0954410019852867
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
In this paper, the small fatigue crack behavior in titanium alloy TC4 under different stress levels was investigated. Single-edge-notch tension specimens were axially fatigued with stress ratio of 0.1 at room temperature. Results show that the naturally initiated cracks nucleate from the alpha/beta interfaces. When the crack is below a critical length of similar to 200 mu m, crack growth rates exhibit large fluctuations and temporary retardations due to microstructure effects. But once the crack length exceeds similar to 200 mu m, the fluctuations in crack growth rates die down and the crack grows more rapidly. There is no distinct effect of stress level on small crack growth rate. A linear relationship exists between the total fatigue life and crack initiation life.
引用
收藏
页码：5567 / 5578
页数：12
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