Cumulative Damage in Very High/Low Cycle Combined Fatigue for TC21 Titanium Alloy
Abstract
:1. Introduction
2. Experimental Procedures
2.1. Materials
2.2. VHCF/LCF Combined Fatigue Tests
3. Results and Discussion
3.1. Effect of LCF Predamage on S-N Curves
3.2. Fracture Analysis
3.3. Very High/Low Cycle Combined Fatigue Damage and Life Prediction
3.3.1. VHCF Damage Model
3.3.2. Prediction Model of Very High/Low Cycle Combined Fatigue
3.3.3. Prediction of Very High/Low Cycle Combined Fatigue Life
4. Conclusions
- LCF predamage with less than 5% of fatigue life had little influence on fatigue limit of TC21 titanium alloy, but reduced fatigue life. Fatigue cracks initiated on the surface of the specimen at high stress amplitude, while fatigue cracks initiated on the subsurface of the specimens at low stress amplitude, and crack initiation site presented the bright particle characteristics.
- Based on Lemaitre damage theory, a very high/low cycle combined fatigue damage model was established to analyze the fatigue damage process, which was consistent with the experimental data. The 5% LCF pre-damage value was the equivalent damage value which was close to the critical value of VHCF crack initiation. Fatigue crack initiation of the specimens with LCF predamage less than 5% took up the major components.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Nie, B.; Liu, S.; Wu, Y.; Song, Y.; Qi, H.; Shi, B.; Zhao, Z.; Chen, D. Cumulative Damage in Very High/Low Cycle Combined Fatigue for TC21 Titanium Alloy. Crystals 2022, 12, 1702. https://doi.org/10.3390/cryst12121702
Nie B, Liu S, Wu Y, Song Y, Qi H, Shi B, Zhao Z, Chen D. Cumulative Damage in Very High/Low Cycle Combined Fatigue for TC21 Titanium Alloy. Crystals. 2022; 12(12):1702. https://doi.org/10.3390/cryst12121702
Chicago/Turabian StyleNie, Baohua, Shuai Liu, Yue Wu, Yu Song, Haiying Qi, Binqing Shi, Zihua Zhao, and Dongchu Chen. 2022. "Cumulative Damage in Very High/Low Cycle Combined Fatigue for TC21 Titanium Alloy" Crystals 12, no. 12: 1702. https://doi.org/10.3390/cryst12121702