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

verfasst von

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

Abstract

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 (σ_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 (K_s) was systematically analyzed, elucidating the intrinsic mapping relationship between R, microstructure, and crack propagation characteristics.

Organisationseinheit(en)

Institut für Baumechanik und Numerische Mechanik

Externe Organisation(en)

Beijing Institute of Technology

Typ

Artikel

Journal

Materials and design

Band

244

Anzahl der Seiten

12

ISSN

0264-1275

Publikationsdatum

08.2024

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Materialwissenschaften, Werkstoffmechanik, Maschinenbau

Elektronische Version(en)

https://doi.org/10.1016/j.matdes.2024.113117 (Zugang: Offen)