Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy
Abstract
:1. Introduction
2. Material and Experimental Procedure
3. Experimental Results
4. Discussion
4.1. Multi-Point Crack Initiation Effect on Fatigue Properties
4.2. Mean Stress Effect on Fatigue Properties
4.3. Estimation of Fatigue Strength
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Specimen Shape | Stress Ratio | 106 | 107 | 108 | 109 | 1010 |
---|---|---|---|---|---|---|
Smooth | −1 | 562.2 | 537.5 | 513.9 | 491.4 | - |
Notch | −1 | 336.0 | 304.5 | 297.4 | 297.4 | 297.4 |
0.1 | 219.2 | 174.1 | 161.5 | 161.5 | 127.7 | |
0.5 | 170.7 | 156.0 | 142.5 | 130.2 | 119.0 |
Fatigue Life | 106 | 107 | 108 | 109 | 1010 |
---|---|---|---|---|---|
FMSSF | 0.4357 | 0.6129 | 0.6885 | 0.6885 | 1.0868 |
FCMSSF | 4.7817 | 6.1663 | 6.6817 | 6.6817 | 8.4937 |
Specimen Code | Nf | σa (MPa) | σw [Equation (7)] (MPa) | σw [Equation (9)] (MPa) | Err. [Equation (7)] (%) | Err. [Equation (9)] (%) | |
---|---|---|---|---|---|---|---|
9 | 2.106 × 106 | 164.0 | 150 | 189 | 138 | 26.0 | −7.8 |
1 | 3.940 × 106 | 134.4 | 170 | 195 | 143 | 14.9 | −15.9 |
16 | 1.618 × 107 | 181.4 | 150 | 186 | 136 | 23.9 | −9.3 |
3 | 2.820 × 107 | 161.5 | 150 | 189 | 139 | 26.3 | −7.6 |
11 | 3.358 × 107 | 256.0 | 135 | 175 | 128 | 30.0 | −4.9 |
6 | 3.424 × 107 | 177.2 | 140 | 187 | 137 | 33.2 | −2.5 |
2 | 5.579 × 107 | 163.1 | 160 | 189 | 138 | 18.2 | −13.5 |
7 | 6.048 × 107 | 154.0 | 140 | 191 | 140 | 36.4 | −0.2 |
12 | 7.114 × 107 | 179.3 | 135 | 186 | 136 | 37.9 | 0.9 |
5 | 1.244 × 108 | 217.4 | 140 | 180 | 132 | 28.8 | −5.7 |
13 | 1.543 × 108 | 236.3 | 130 | 178 | 130 | 36.8 | 0.1 |
10 | 2.423 × 108 | 210.3 | 140 | 181 | 133 | 29.5 | −5.2 |
17 | 4.401 × 108 | 235.5 | 130 | 178 | 130 | 36.8 | 0.2 |
4 | 6.177 ×108 | 208.6 | 140 | 182 | 133 | 29.7 | −5.1 |
8 | 3.062 × 109 | 196.1 | 130 | 183 | 134 | 41.1 | 3.3 |
14 | 3.289 × 109 | 406.7 | 120 | 162 | 119 | 35.3 | −0.9 |
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Yang, K.; Zhong, B.; Huang, Q.; He, C.; Huang, Z.-Y.; Wang, Q.; Liu, Y.-J. Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy. Materials 2018, 11, 1778. https://doi.org/10.3390/ma11091778
Yang K, Zhong B, Huang Q, He C, Huang Z-Y, Wang Q, Liu Y-J. Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy. Materials. 2018; 11(9):1778. https://doi.org/10.3390/ma11091778
Chicago/Turabian StyleYang, Kun, Bin Zhong, Qi Huang, Chao He, Zhi-Yong Huang, Qingyuan Wang, and Yong-Jie Liu. 2018. "Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy" Materials 11, no. 9: 1778. https://doi.org/10.3390/ma11091778