Effects of mean load and load amplitude on biaxial dwell fatigue behavior of commercial pure titanium

Hu Changqun; Zhao Jiayu; Chang Le; Zhou Changyu; He Xiaohua

doi:10.7513/j.issn.1004-7638.2023.03.008

Volume 44 Issue 3

Jun. 2023

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Hu Changqun, Zhao Jiayu, Chang Le, Zhou Changyu, He Xiaohua. Effects of mean load and load amplitude on biaxial dwell fatigue behavior of commercial pure titanium[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 52-60. doi: 10.7513/j.issn.1004-7638.2023.03.008

Citation:

Hu Changqun, Zhao Jiayu, Chang Le, Zhou Changyu, He Xiaohua. Effects of mean load and load amplitude on biaxial dwell fatigue behavior of commercial pure titanium[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 52-60. doi: 10.7513/j.issn.1004-7638.2023.03.008

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Effects of mean load and load amplitude on biaxial dwell fatigue behavior of commercial pure titanium

doi: 10.7513/j.issn.1004-7638.2023.03.008

Hu Changqun^{1, 2
,},
Zhao Jiayu^{1, 2},
Chang Le^{1, 2},
Zhou Changyu^{1, 2},
He Xiaohua¹

1.
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China
2.
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing 211816, Jiangsu, China

Received Date: 2022-11-18
Publish Date: 2023-06-30

Abstract

Abstract

Based on biaxial dwell fatigue tests at room temperature, effects of different mean loads and load amplitudes on the biaxial dwell fatigue behavior of commercial pure titanium were studied. The results show that the mean strain and strain rate increase with the increase of mean load and load amplitude under the same dwell time. When the load amplitude remains constant, the creep strain increases with the increase of the mean load. However, when the mean load remains constant, the creep strain decreases with the increase of the load amplitude. By analyzing the interaction between biaxial ratcheting and creep strain, it is found that ratcheting strain and creep strain are always restricted by each other. Fracture surface analysis shows that with the increase of mean load and load amplitude, the fatigue strip characteristics disappear gradually, and the number of dimples and tearing ridges significantly increases, exhibiting ductile failure mode. Meanwhile, with the increase of mean load or load amplitude, equivalent strain amplitude is increased, leading to the decrease of fatigue life. Compared with the effect of mean load, fatigue life is more sensitive to the variation of load amplitude. Maximum principal strain, maximum shear strain, Mises equivalent strain, maximum principal stress and SWT models are used to perform biaxial dwell fatigue life prediction, among them SWT model has the highest prediction accuracy.
- commercial pure titanium,
- asymmetric load,
- biaxial dwell fatigue,
- life prediction

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References(25)

References

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