Effect of grain structure on fatigue crack propagation behavior of 2024 aluminum alloy under different stress ratios

被引：5
|
作者：
Chen, Hongtao [1 ,2 ]
Liu, Shuyao [1 ]
Wang, Pai [1 ]
Wang, Xibin [1 ]
Liu, Zhibing [1 ]
Aldakheel, Fadi [2 ]
机构：
[1] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China
[2] Leibniz Univ Hannover, Inst Mech & Computat Mech, Appelstr 9a, D-30167 Hannover, Germany
来源：
MATERIALS & DESIGN | 2024年 / 244卷
基金：
中国国家自然科学基金;
关键词：
Stress ratio; Fatigue crack propagation; Twist angle; Schmid factor; Crack tip shielding; GROWTH; TEXTURE; ORIENTATION; RESISTANCE; THRESHOLD; CLOSURE; MICROSTRUCTURE; DEFLECTION; ANISOTROPY;
D O I：
10.1016/j.matdes.2024.113117
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The fatigue load that a material experiences and its microstructure are important factors influencing fatigue crack propagation behavior. This study employed laser scanning microscopy and electron backscatter diffraction (EBSD) technology, along with fatigue crack propagation experiments, to investigate the fatigue crack propagation behavior of 2024 aluminum alloy under varying stress ratios (R). The results showed that the stress amplitude (sigma p) was the main factor controlling the fatigue crack propagation life (N). Additionally, detailed characterization of the fatigue crack propagation path was conducted using crystal models and EBSD. A fatigue crack propagation model for 2024 aluminum alloy under different R-values was established based on the grain twist angle and Schmid factor. Finally, the impact of R on the crack tip shielding (Ks) was systematically analyzed, elucidating the intrinsic mapping relationship between R, microstructure, and crack propagation characteristics.
引用
收藏
页数：12
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