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

Hongtao Chen; Shuyao Liu; Pai Wang; Xibin Wang; Zhibing Liu; Fadi Aldakheel

Materials & Design (Aug 2024)

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

Hongtao Chen,
Shuyao Liu,
Pai Wang,
Xibin Wang,
Zhibing Liu,
Fadi Aldakheel

Affiliations

Hongtao Chen: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China; Institute of Mechanics and Computational Mechanics, Leibniz University Hannover, Appelstrasse 9a, 30167 Hannover, Germany
Shuyao Liu: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Pai Wang: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Xibin Wang: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Zhibing Liu: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China; Corresponding author.
Fadi Aldakheel: Institute of Mechanics and Computational Mechanics, Leibniz University Hannover, Appelstrasse 9a, 30167 Hannover, Germany

Journal volume & issue: Vol. 244
p. 113117

Abstract

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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 (σp) 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.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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