Numerical Prediction of the Effect of Laser Shock Peening on Residual Stress and Fatigue Life of Ti-6Al-4V Titanium Alloy
Abstract
:1. Introduction
2. Experimental Section
2.1. LSP Process and Stress Characterization
2.2. Fatigue Test
3. Numerical Modeling
3.1. LSP Process and Stress Characterization
3.2. Four-Point Bend Stress Simulation
3.3. Fatigue Life Simulation
4. Results and Discussion
4.1. Residual Stress Induced by LSP
4.2. Four-Point Bending Stress
4.3. Fatigue Life
5. Conclusions
- (1)
- The simulation results of the residual stress field induced by LSP fit well with the experimental results. The former show that LSP treatment induces the maximum CRS on the surface of the specimen is up to 800 MPa and the thickness of the CRS layers for both the upper and lower sides are 0.623 mm and 0.718 mm, respectively.
- (2)
- During the four-point bending process, the pretreatment of LSP reduces the maximum principal stress from 608 MPa to 540 MPa and changes the location of the maximum stress from the upper surface into the internal position at a depth of about 0.6 mm, which is due to the existence of CRS layer caused by LSP with the depth of 0.623 mm under the surface of the specimen.
- (3)
- The fatigue lives of the specimens with LSP treatment obtained from experiment and predictions are, respectively, 4.2 and 17.24 times longer than those of the non-LSP specimens. One of the main reasons for the larger fatigue-life difference between prediction and experiment for the LSP-treated specimen compared with that for the non-LSP specimen is that the measured mean life is lower than the actual life due to the higher sensibility of fatigue life on machining quality of the LSP-treated specimen. The longer fatigue life of the LSP-treated specimen results from the reduced maximum principal stress and its location changing from the upper surface into the internal position induced by the CRS layer produced by LSP treatment.
- (4)
- The combination model of the LSP-induced residual stress simulation and fatigue life prediction is reliable compared with the experimental results and is expected to be applied in engineering fields to efficiently find optimal LPS process parameters that make the components meet service life requirements. However, there is still some work to be done in the future. On one hand, the influence of surface quality on the fatigue life measurement of LSP-treated specimens should be further avoided so that more accurate lives will be measured to further validate the model. On the other hand, comparative study of fatigue lives obtained from simulations and experiments for different load amplitudes would be carried out to make the work more complete.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
References
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A (MPa) | B (MPa) | n | C | m | ρ (kg/m3) | E (GPa) | ν | σb (MPa) | |
---|---|---|---|---|---|---|---|---|---|
862 | 331 | 0.34 | 0.012 | 0.8 | 1 | 4500 | 110 | 0.342 | 910 |
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Ouyang, P.; Luo, X.; Dong, Z.; Zhang, S. Numerical Prediction of the Effect of Laser Shock Peening on Residual Stress and Fatigue Life of Ti-6Al-4V Titanium Alloy. Materials 2022, 15, 5503. https://doi.org/10.3390/ma15165503
Ouyang P, Luo X, Dong Z, Zhang S. Numerical Prediction of the Effect of Laser Shock Peening on Residual Stress and Fatigue Life of Ti-6Al-4V Titanium Alloy. Materials. 2022; 15(16):5503. https://doi.org/10.3390/ma15165503
Chicago/Turabian StyleOuyang, Peixuan, Xuekun Luo, Zhichao Dong, and Shuting Zhang. 2022. "Numerical Prediction of the Effect of Laser Shock Peening on Residual Stress and Fatigue Life of Ti-6Al-4V Titanium Alloy" Materials 15, no. 16: 5503. https://doi.org/10.3390/ma15165503