Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load
Abstract
:1. Introduction
2. Materials and Methods
2.1. Equivalent Surface Defect Model
2.2. Fatigue Life Prediction Model
2.2.1. Prediction of Crack Initiation Life
2.2.2. Prediction of Crack Propagation Life
2.3. Materials and Specimens
2.4. Three-Point Bending Static Test
2.5. Three-Point Bending Fatigue Test
3. Results and Discussion
3.1. Validation of Equivalent Surface Defect Model
3.2. Validation of Fatigue Life Prediction Model
3.2.1. Life Crack Initiation Life Ni
3.2.2. Life Crack Initiation Life Np
4. Conclusions
- (1)
- The variation of volume loss rate has a significant effect on fatigue life. A small increment in the volume loss rate can reduce the fatigue life substantially. Under the same stress level, the three-point bending fatigue life of DH36 steel decreases with the increase in volume loss rate. When the volume loss rate reaches 2.68%, the fatigue life decreases by more than 50%.
- (2)
- The influence of the pitting hole notch effect and size effect on fatigue life was quantified by volume loss rate and the pitting depth-to-diameter ratio, and an equivalent surface defect model was proposed. The model was validated using the Bayesian method, and the results were in good agreement that the equivalent surface defect model can be used to measure the influence of the notch effect and size effect on fatigue life.
- (3)
- Based on energy theory and slip band dislocation theory, an equivalent surface defect model is combined to predict crack initiation life. Compared with the experimental results, the average relative error is 10.37%, and the maximum relative errors are 15.91% and 21.84%, respectively. The reliability of the fatigue life prediction model at the crack initiation stage is verified.
- (4)
- Based on the Paris fatigue life prediction model, the crack propagation life is predicted, where the crack angle is adopted as a variable. Compared with the experimental results, the average error is 15.13%, and the maximum relative error is 22.16%. The reliability of the fatigue life prediction model in the crack extension stage is verified.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Element | % | Element | % | Element | % |
---|---|---|---|---|---|
C | 0.14 | Als | 0.039 | Ceq | 0.36 |
Si | 0.21 | Nb | 0.012 | Mo | 0.007 |
Mn | 1.19 | Cr | 0.05 | V | 0.003 |
S | 0.003 | Ni | 0.02 | Ti | 0.011 |
P | 0.014 | Cu | 0.05 |
Specimen Index | Pitting Hole | ||
---|---|---|---|
Diameter d (mm) | Depth h (mm) | (%) | |
0 | 0 | 0 | |
2 | 4 | 0.168 | |
4 | 4 | 0.670 | |
6 | 2 | 0.754 | |
6 | 3 | 1.131 | |
6 | 4 | 1.508 | |
6 | 5 | 1.885 | |
8 | 4 | 2.681 |
Specimen | ||||
---|---|---|---|---|
Load (kN) | 17.1 | 15.5 | 14.2 | 15.0 |
Load (kN) | 14.0 | 13.0 | 12.6 | 11.5 |
Specimen Index | Maximum Load (kN) | Fatigue Life N (Cycle) | Crack Initiation Life (Cycle) |
---|---|---|---|
10.9 | 91,035 | 68,276 | |
12.4 | 41,218 | 34,072 | |
14.0 | 25,291 | 20,175 | |
9.9 | 77,021 | 58,536 | |
11.4 | 35,987 | 29,116 | |
12.8 | 19,211 | 15,177 | |
10.5 | 79,196 | 62,565 | |
12.0 | 38,401 | 31,265 | |
13.5 | 21,132 | 16,694 | |
9.8 | 68,781 | 53,649 | |
11.2 | 31,025 | 24,197 | |
12.6 | 16,445 | 12,745 | |
9.1 | 68,218 | 52,528 | |
10.4 | 25,169 | 19,124 | |
11.7 | 13,978 | 10,484 | |
8.8 | 59,005 | 43,075 | |
10.1 | 19,256 | 14,311 | |
11.3 | 12,391 | 8922 | |
8.1 | 43,836 | 31,225 | |
9.2 | 20,125 | 15,036 | |
10.4 | 10,018 | 7013 |
Specimen No. | Observation Times | Extension Angle (°) | Life Percentage (%) |
---|---|---|---|
1 | 6.77 | 82.9 | |
2 | 7.21 | 85.4 | |
3 | 7.98 | 87.8 | |
4 | 9.15 | 90.2 | |
5 | 12.11 | 92.7 | |
6 | 17.82 | 95.1 | |
7 | 25.41 | 98.6 | |
8 | 79.23 | 100 | |
1 | 6.96 | 80.7 | |
2 | 7.38 | 83.5 | |
3 | 8.91 | 86.3 | |
4 | 10.77 | 89.0 | |
5 | 13.32 | 91.8 | |
6 | 18.49 | 94.6 | |
7 | 25.93 | 97.9 | |
8 | 76.83 | 100 | |
1 | 5.59 | 78.2 | |
2 | 5.98 | 80.8 | |
3 | 6.81 | 84.6 | |
4 | 7.93 | 88.5 | |
5 | 9.15 | 92.3 | |
6 | 13.38 | 96.2 | |
7 | 52.12 | 100 | |
1 | 6.34 | 76.9 | |
2 | 6.65 | 80.1 | |
3 | 7.75 | 83.3 | |
4 | 8.91 | 86.5 | |
5 | 11.01 | 89.7 | |
6 | 13.55 | 92.9 | |
7 | 18.11 | 96.1 | |
8 | 64.10 | 100 | |
1 | 8.04 | 75.3 | |
2 | 8.61 | 79.2 | |
3 | 9.45 | 83.1 | |
4 | 11.37 | 87.1 | |
5 | 14.29 | 91.1 | |
6 | 19.92 | 95.1 | |
7 | 27.96 | 97.0 | |
8 | 70.25 | 100 | |
1 | 8.06 | 73.4 | |
2 | 8.64 | 77.0 | |
3 | 10.70 | 81.6 | |
4 | 13.74 | 85.3 | |
5 | 18.27 | 89.9 | |
6 | 25.54 | 93.5 | |
7 | 36.45 | 97.1 | |
8 | 73.78 | 100 | |
1 | 8.99 | 72.9 | |
2 | 9.98 | 77.5 | |
3 | 11.55 | 82.0 | |
4 | 14.52 | 86.6 | |
5 | 18.74 | 91.1 | |
6 | 23.93 | 95.9 | |
7 | 62.44 | 100 |
Specimen | (×10−8) | Predicted Results (Cycles) | Experimental Results (Cycles) | Relative Error (%) |
---|---|---|---|---|
1.724 | 76,398 | 68,276 | 11.90 | |
2.842 | 64,160 | 58,536 | 9.61 | |
3.448 | 67,388 | 62,565 | 7.71 | |
4.099 | 52,443 | 53,649 | 2.25 | |
4.878 | 54,195 | 52,528 | 3.17 | |
5.816 | 36,192 | 43,075 | 15.91 | |
9.754 | 34,403 | 31,225 | 10.18 | |
1.724 | 24,347 | 20,175 | 21.84 | |
2.842 | 13,693 | 15,177 | 9.76 | |
3.448 | 13,968 | 16,694 | 16.33 | |
4.099 | 11,512 | 12,745 | 9.67 | |
4.878 | 11,162 | 10,484 | 6.47 | |
5.816 | 8538 | 8922 | 4.3 | |
9.754 | 8144 | 7013 | 16.13 |
Specimen | Predicted Results (Cycles) | Experimental Results (Cycles) | Relative Error (%) |
---|---|---|---|
4191 | 5029 | 16.67 | |
5766 | 6190 | 6.85 | |
8443 | 6912 | 22.16 | |
6753 | 5957 | 13.36 | |
5878 | 4983 | 17.96 | |
5433 | 4564 | 19.04 | |
4171 | 4629 | 9.89 |
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Liu, X.; Yan, B.; Sun, H. Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load. Metals 2023, 13, 1839. https://doi.org/10.3390/met13111839
Liu X, Yan B, Sun H. Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load. Metals. 2023; 13(11):1839. https://doi.org/10.3390/met13111839
Chicago/Turabian StyleLiu, Xueshu, Bingrong Yan, and Hongtu Sun. 2023. "Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load" Metals 13, no. 11: 1839. https://doi.org/10.3390/met13111839