1. Investigation of high-cycle fatigue property and fatigue crack propagation behavior of a die-forged 2014 aluminum alloy aircraft wheel.
- Author
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Shen, Zhengjun, Su, Yuchang, Deng, Jichang, and Huang, Zhirong
- Subjects
- *
FATIGUE cracks , *CRACK propagation (Fracture mechanics) , *FATIGUE limit , *ALLOY fatigue , *MATERIAL plasticity , *HIGH cycle fatigue , *MATERIAL fatigue - Abstract
• Fatigue strength anisotropy was related to the degree of plastic deformation. • Quantitative analysed the effect of fatigue crack initiation on fatigue life. • A new fatigue life model was established considering inclusions number. • Second-phase particles, crack closure and twist angle induced FCP anisotropy. The high-cycle fatigue (HCF) property and fatigue crack propagation (FCP) behavior of aircraft wheels manufactured by die forging were investigated from two sampling directions (rims and discs). The results indicate that the HCF anisotropy of the rim and disc specimens increases with decreasing stress amplitude, and the fatigue strengths are 181 MPa and 157 MPa, respectively. Based on the quantitative analysis of the fatigue fractures, a fatigue life prediction model considering the Fe/Mn-containing particles quantity factor S has been established, and the predicted values are reasonably accurate to the test values. The crack path microstructure indicates that Fe/Mn-containing particles can cause crack deflection while acting as bridges for FCP; Crack closure induced by oxides and plastic zones significantly decelerated the FCP rate. Additionally, fatigue cracks tend to propagate toward grains with smaller twist angles and higher Schmid factors (SF). [ABSTRACT FROM AUTHOR]
- Published
- 2024
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