Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component
Abstract
:1. Introduction
2. Laser Shock Peening Model
2.1. Titanium Alloy Material Model
2.2. Finite Element Model
2.3. Model Validation
3. Results and Analysis
3.1. Residual Stress-Strain Profile
3.2. Analysis on the Formation Mechanism of Residual Stress-Strain Profile
3.2.1. Propagation Law of Laser Shock Wave in Sheet
3.2.2. Material Dynamic Response
3.3. Residual Stress-Strain Profile Control Method and Experimental Verification
4. Conclusions
- Compared with the infinite thickness model, the equivalent plastic strain of the sheet after laser shock increases significantly in radial direction and depth, resulting in the formation of tensile residual stresses up to 410 MPa in the radial direction of the spot 0.5 mm and the depth of 0.3 mm. Although the residual compressive stress is formed out-side the radius of 0.5 mm, its value is quite small compared to the infinite thickness model, only 200 MPa.
- Under the condition of the infinite-thickness model, the longitudinal wave attenuates exponentially and linearly in the elastic-plastic wave stage and the elastic wave stage, respectively. The shock wave will be reflected repeatedly in the sheet, and the property will change repeatedly between compression wave and extension wave. The reflected shock wave will be coupled with the subsequent shock wave to increase the pressure, and the peak pressure will be formed at the subsurface 0.2 mm.
- Compared with the infinite thickness model, the transverse plastic strain of the sheet surface formed under the action of the first compression wave will be plastic deformation again under the action of the subsequent reflected tensile wave, so that the transverse plastic strain gradually decreases and the material is in the transverse compression state. This is the direct cause of the increase of equivalent plastic strain and the formation of residual tensile stress.
- When using single-sided laser shock thin blades, using a "hard" wave-transmitting layer of the same material as the blade or a "soft" wave-transmitting layer configured with powder and solvent can effectively reduce the shock wave reflection intensity and improve the strengthening effect. And a better impedance matching effect is achieved under the condition of the "hard" wave-transmitting layer; compared with the "soft" wave-transmitting layer, the residual compressive stress is increased by about 100 MPa.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameters | Value |
---|---|
Density/(g·cm−3) | 4.68 |
Elastic modulus/GPa | 113 |
Poisson’s ratio | 0.33 |
Elastic limit/GPa | 2.9 |
A/MPa | 1231 |
B/MPa | 356.1751 |
n | 0.2623 |
c | 0.0197 |
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Nie, X.; Tang, Y.; Zhao, F.; Yan, L.; Wu, H.; Wei, C.; He, W. Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component. Materials 2021, 14, 1878. https://doi.org/10.3390/ma14081878
Nie X, Tang Y, Zhao F, Yan L, Wu H, Wei C, He W. Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component. Materials. 2021; 14(8):1878. https://doi.org/10.3390/ma14081878
Chicago/Turabian StyleNie, Xiangfan, Yuyuan Tang, Feifan Zhao, Li Yan, Haonian Wu, Chen Wei, and Weifeng He. 2021. "Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component" Materials 14, no. 8: 1878. https://doi.org/10.3390/ma14081878
APA StyleNie, X., Tang, Y., Zhao, F., Yan, L., Wu, H., Wei, C., & He, W. (2021). Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component. Materials, 14(8), 1878. https://doi.org/10.3390/ma14081878