Study on stress-wave propagation and residual stress distribution of Ti-17 titanium alloy by laser shock peening

2017 ◽  
Vol 122 (19) ◽  
pp. 193102 ◽  
Author(s):  
Yatian Pei ◽  
Chenghong Duan
Keyword(s):  
Residual Stress ◽  
Wave Propagation ◽  
Titanium Alloy ◽  
Stress Distribution ◽  
Stress Wave ◽  
Residual Stress Distribution ◽  
Laser Shock Peening ◽  
Stress Wave Propagation ◽  
Laser Shock ◽  
Shock Peening

scholarly journals Simulation and Experimental Study on Residual Stress Distribution in Titanium Alloy Treated by Laser Shock Peening with Flat-Top and Gaussian Laser Beams

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1343 ◽  
Author(s):  
Xiang Li ◽  
Weifeng He ◽  
Sihai Luo ◽  
Xiangfan Nie ◽  
Le Tian ◽  
...  
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Stress Distribution ◽  
Energy Distribution ◽  
Laser Energy ◽  
Residual Stress Distribution ◽  
Laser Shock Peening ◽  
Laser Beams ◽  
Laser Shock ◽  
Shock Peening

The residual stress introduced by laser shock peening (LSP) is one of the most important factors in improving metallic fatigue life. The shock wave pressure has considerable influence on residual stress distribution, which is affected by the distribution of laser energy. In this work, a titanium alloy is treated by LSP with flat-top and Gaussian laser beams, and the effects of spatial energy distribution on residual stress are investigated. Firstly, a 3D finite element model (FEM) is developed to predict residual stress with different spatial energy distribution, and the predicted residual stress is validated by experimental data. Secondly, three kinds of pulse energies, 3 J, 4 J and 5 J, are chosen to study the difference of residual stress introduced by flat-top and Gaussian laser beams. Lastly, the effect mechanism of spatial energy distribution on residual stress is revealed.

Experimental and Numerical Analysis of the Distribution of Residual Stresses Induced by Laser Shock Peening in a 2050-T8 Aluminium Alloy

2011 ◽  
Vol 681 ◽  
pp. 296-302 ◽  
Author(s):  
Neila Hfaiedh ◽  
P. Peyre ◽  
I. Popa ◽  
Vincent Vignal ◽  
Wilfrid Seiler ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Residual Stress Distribution ◽  
Laser Shock Peening ◽  
Treatment Technique ◽  
Laser Shock ◽  
X Ray Diffraction ◽  
Shock Peening

Laser shock peening (LSP) is an innovative surface treatment technique successfully applied to improving fatigue performance of metallic material. The specific characteristic of (LSP) is the generation of a low work-hardening and a deep compressive residual stresses mechanically produced by a laser-induced shock wave propagating in the material. The aim of this study is to analyse the residual stress distribution induced by laser peening in 2050-T8 aluminium alloy experimentally by the X-ray diffraction technique (method sin2Y) and numerically, by a finite element numerical modelling. A specific focus was put on the residual stress distribution along the surface of the impacted material.

scholarly journals Study on Residual Stress Distribution of 7050 Aluminum Sheet with Groove after Laser Shock Peening

2019 ◽  
Vol 37 (4) ◽  
pp. 643-649
Author(s):  
Yong Du ◽  
Yu'e Ma ◽  
Lei Gou ◽  
Chao Guo ◽  
Bo Li ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Laser Power ◽  
Laser Power Density ◽  
Residual Stress Distribution ◽  
Laser Shock Peening ◽  
Aluminum Sheet ◽  
Bottom Surface ◽  
Laser Shock ◽  
Shock Peening

In order to study the residual stress profile of 7050-T7451 aluminum sheet with groove after laser shock peening (LSP), the residual stress distribution was measured. It is shown that the residual stress decreases gradually from the center to the edge of groove; and then there is the minimum value at the edge of the groove bottom surface. By using ABAQUS software to establish three-dimensional finite element model for 7050 aluminum sheet with groove, and the load was applied by VDLOAD subroutine. The finite element analysis was performed and the analysis results were compared with the experimental measurements, in which the both the results agree with each other very well. And then the residual stress distribution of the sheet was analyzed after laser shock peening under different laser processing parameters. It is shown that the residual stress decreases firstly and then increases with the rise of laser power density from 0.84 GW/cm2 to 5.29 GW/cm2. And the residual stress obtains the minimum value -230 MPa at the laser power density of 3.06 GW/cm2. With the increasing of spot diameter from 4 mm to 6 mm, the residual stress increased from -214 MPa to -30 MPa. With the increasing of laser pulse width from 10 ns to 40 ns, the residual stress decreased from -21 MPa to -288 MPa; and the depth of the compressive residual stress increased too. For all simulations under different LSP parameters, the minimum surface residual stress achieved at the bottom surface of the groove as well.

Regularity of Residual Stress Distribution in Titanium Alloys Induced by Laser Shock Peening with Different Energy Spatial Distributions

2018 ◽  
Vol 55 (6) ◽  
pp. 061402
Author(s):  
李翔 Li Xiang ◽  
何卫锋 He Weifeng ◽  
聂祥樊 Nie Xiangfan ◽  
杨竹芳 Yang Zhufang ◽  
罗思海 Luo Sihai ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Titanium Alloys ◽  
Residual Stress Distribution ◽  
Laser Shock Peening ◽  
Spatial Distributions ◽  
Laser Shock ◽  
Shock Peening

Laser Shock Peening of Nanoparticles Integrated Alloys: Numerical Simulation and Experiments

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Chang Ye ◽  
Gary J. Cheng
Keyword(s):  
Residual Stress ◽  
Wave Propagation ◽  
Experimental Studies ◽  
Deformation Energy ◽  
Laser Shock Peening ◽  
Stress Wave Propagation ◽  
Laser Shock ◽  
Properties Of Materials ◽  
Shock Peening ◽  
Integrated Structures

Nanocomposite and multiphase structures have become more important nowadays to enhance the mechanical properties of materials. Laser shock peening (LSP) is one of the most efficient ways to increase component fatigue life. In this paper, numerical and experimental studies have been carried out to study the effects of nanoparticles integrated structures during the laser shock peening of aluminum alloys. The LSP experiment of aluminum samples with different particle densities was carried out. The effect of nanoparticle on shock wave propagation, plastic deformation, energy absorption, and residual stress magnitude was studied. A qualitative agreement is found between experiment and simulation. The existence of nanoparticles affects the stress wave propagation and increases the ratio of absorbed energy to total energy and thus the magnitude of residual stress of the material after LSP.

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