The Influence of Laser Shock Peening on Fatigue Properties of AA2024-T3 Alloy with a Fastener Hole
Abstract
:1. Introduction
2. Materials and Methods
2.1. Material and Specimens
2.2. Experimental Program
2.3. Fatigue Testing of Specimens and Preparation of Specimens with Initial Fatigue Cracks
2.4. Laser Shock Peening and Residual Stress Analysis
2.5. Weibull Distribution
3. Results and Discussion
3.1. Fatigue Tests
3.2. Effect of LSP on Crack Initiation and Crack Growth
4. Conclusions
- The fatigue life of the specimens with a fastener hole introduced after LSP treatment is higher by a factor of 3 than that of specimens with a hole, but without LSP.
- LSP significantly extends the fatigue life of specimens with an initial fatigue crack, but the effect of LSP depends on the crack length. The larger the crack length, the weaker the effect of the subsequent LSP processing. The fatigue life of LSP-treated specimens with an initial crack of 2.5 ± 0.1 mm exceeds the fatigue life of base material specimens by a factor of 1.5, specimens with an initial crack of 1.8 ± 0.1 mm by a factor of 1.7, and specimens with an initial crack of 1.0 ± 0.1 mm by a factor of 3.3.
- In accordance with the above findings, LSP can be applied to the specimens without cracks in a fastener hole, which is in good agreement with previous studies [8,9,10,11,17], and it can be applied for healing the fatigue cracks up to a length of 2.5 ± 0.1 mm detected in a fastener hole with the diameter of 4.8 mm.
- LSP has a different effect on the fatigue initiation and growth periods. The effect of LSP on the crack growth period is significantly higher (approximately by a factor of 4.6) than on the crack initiation period. The effect of LSP on the crack retardation as a function of the crack length has been quantitatively studied.
- Cracks nucleated in residual stress fields grow significantly faster than cracks nucleated before introducing residual stresses. In this regard, LSP has good potential to be applied as a repair technique.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Group Number | Feature |
---|---|
1 (BM) | no initial crack in the fastener hole |
2 | initial crack of 1.0 ± 0.1 mm in the fastener hole and subsequent LSP treatment |
3 | initial crack of 1.8 ± 0.1 mm in the fastener hole and subsequent LSP treatment |
4 | initial crack of 2.5 ± 0.1 mm in the fastener hole and subsequent LSP treatment |
5 | LSP treatment and subsequently drilled rivet hole without an initial crack |
Group Number | Shape Parameter, β | Scale Parameter, T | Life Extension |
---|---|---|---|
1 (base material specimens) | 7.15 | 4.62 × 105 | - |
2 (crack 1.0 mm + LSP) | 7.77 | 1.51 × 106 | 3.3 |
3 (crack 1.8 mm + LSP) | 5.74 | 8.08 × 105 | 1.7 |
4 (crack 2.5 mm + LSP) | 4.78 | 6.68 × 105 | 1.5 |
5 (LSP) | 6.42 | 1.45 × 106 | 3.1 |
Case | Shape Parameter, β | Scale Parameter, T | Enhancement |
---|---|---|---|
crack initiation (hole) | 4.90 | 3.06 × 105 | - |
crack initiation (LSP + hole) | 5.73 | 4.16 × 105 | 1.4 |
crack growth (hole) | 7.44 | 1.61 × 105 | - |
crack growth (LSP + hole) | 5.01 | 1.05 × 106 | 6.5 |
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Sikhamov, R.; Fomin, F.; Klusemann, B.; Kashaev, N. The Influence of Laser Shock Peening on Fatigue Properties of AA2024-T3 Alloy with a Fastener Hole. Metals 2020, 10, 495. https://doi.org/10.3390/met10040495
Sikhamov R, Fomin F, Klusemann B, Kashaev N. The Influence of Laser Shock Peening on Fatigue Properties of AA2024-T3 Alloy with a Fastener Hole. Metals. 2020; 10(4):495. https://doi.org/10.3390/met10040495
Chicago/Turabian StyleSikhamov, Ruslan, Fedor Fomin, Benjamin Klusemann, and Nikolai Kashaev. 2020. "The Influence of Laser Shock Peening on Fatigue Properties of AA2024-T3 Alloy with a Fastener Hole" Metals 10, no. 4: 495. https://doi.org/10.3390/met10040495