1. Multiaxial fatigue life prediction based on effective factor with shear/axial stress ratio for Ti60 titanium alloy in very high cycle regime.
- Author
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Chen, Chao-Lin, Shang, De-Guang, Xiao, Na-Min, Li, Xing-Wu, Sha, Ai-Xue, Li, Jing, Li, Jing-Xuan, Tang, Zhi-Qiang, and Han, Zhao-Yun
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HIGH cycle fatigue , *AXIAL stresses , *FATIGUE life , *TITANIUM alloys , *FATIGUE limit , *ALLOY fatigue - Abstract
• Failure mechanism of titanium alloy is identified under multiaxial loading in the VHCF. • A pragmatic equivalent method for multiaxial to uniaxial load is proposed. • A multiaxial fatigue life prediction method based on uniaxial S-N curve is proposed. Fatigue failure mechanism of Ti60 titanium alloy under tension–torsion multiaxial loading in the very high cycle regime was studied first, and the results showed that the shear/axial stress ratio directly affects the failure mechanism. When the shear/axial stress ratio is relatively small, cracks tend to originate from the subsurface in single-point initiation mode, and the larger the shear/axial stress ratio, the more cracks tend to originate from the surface in multi-point initiation mode. Then, a pragmatic equivalent method for multiaxial to uniaxial load based on the law of shear/axial stress ratio on fatigue strength was proposed. Based on this method and uniaxial S - N curve, the fatigue lives of Ti60 specimens under shear/axial stress ratios of 1.37, 1.95, and 3.53 was predicted, and the experimental results showed that the prediction error is basically within a factor of 3. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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