Laser shock processing with 20 MW laser pulses delivered by optical fibers

2000 ◽  
Vol 9 (3) ◽  
pp. 235-238 ◽  
Author(s):  
T. Schmidt-Uhlig ◽  
P. Karlitschek ◽  
M. Yoda ◽  
Y. Sano ◽  
G. Marowsky
Keyword(s):  
Optical Fibers ◽  
Laser Pulses ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

Laser Shock Processing of Ni-Base Superalloy and High Cycle Fatigue Properties

2011 ◽  
Vol 697-698 ◽  
pp. 235-238 ◽  
Author(s):  
L. Zhou ◽  
Y.H. Li ◽  
W.F. He ◽  
X.D. Wang ◽  
Q.P. Li
Keyword(s):  
High Cycle Fatigue ◽  
Laser Pulses ◽  
Fatigue Properties ◽  
Treatment Technique ◽  
Cycle Fatigue ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
First Order ◽  
Shock Processing ◽  
Base Superalloy

A plasma sound wave detection method of laser shock processing (LSP) technology is proposed. Speciments of Ni-base superalloy are used in this paper. A convergent lens is used to deliver 1.2 J, 10 ns laser pulses by a Q-switch Nd:YAG laser, operating at 1 Hz. The influence of the laser density to the shock wave is investigated in detail for two different wavelength lasers. Constant amplitude fatigue data are generated in room environment using notch specimens tested at an amplitude of vibration 2.8 mm and first-order flextensional mode. The results show that LSP is an effective surface treatment technique for improving the high cycle fatigue performance of Ni-base superalloys having a factor of 1.62 improvement in fatigue life.

Mechanism Influence on Fatigue Characters of Aerial Engine Blade by Laser Shock Processing

2007 ◽  
Vol 24-25 ◽  
pp. 371-375
Author(s):  
Xu Dong Ren ◽  
Yong Kang Zhang ◽  
Y.H. Li ◽  
W. Cheng ◽  
M. Zhuang
Keyword(s):  
Fatigue Life ◽  
Nuclear Power ◽  
Power Plants ◽  
Fatigue Cracking ◽  
Laser Pulses ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Engine Blade ◽  
Short Laser Pulses ◽  
Shock Processing

In Laser Shock Processing when a material is irradiated with short laser pulses (ns)of very high densities(>GW/cm2), a high intensity shock wave is generated. This treatment can reduce the rate of fatigue cracking and stress corrosion cracking in structural metals or alloys needed for aerospace, nuclear power plants, and military applications. And laser shock processing has been shown to be a viable method of strengthen metallic components. Transformation on the characters of aerial engine blade by laser shock processing and influence on the fatigue life with these transformations were studied. And the relatively fatigue life experiment of aerial engine blade was done to validate the influence on the fatigue life of aerial engine by laser shock processing. It was found that laser shock processing could bring residual compressive stress and high-density dislocation on the surface of the blade. All these transformation greatly increase the fatigue life of aerial engine blade.

Experiment Research on Improving the Fatigue Life of 12Cr2Ni4A Welding Joints by Laser Shock Processing

2010 ◽  
Vol 43 ◽  
pp. 467-470
Author(s):  
Cheng Wang ◽  
L.C. Zhou ◽  
Q. He ◽  
Z.F. An ◽  
J.Z. Lu
Keyword(s):  
Fatigue Life ◽  
Laser Pulses ◽  
Rapid Expansion ◽  
Nanosecond Laser ◽  
Residual Tensile Stress ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Nanosecond Laser Pulses ◽  
Welding Joints ◽  
Shock Processing

Laser Shock Processing (LSP) has become an advanced method for improving the mechanical properties such as hardness, residual stress and fatigue life. Nanosecond laser pulses of extreme intensity generated subsequent plasma. The rapid expansion of high pressure plasma creates a shock wave that propagates through the material, creating dislocations and inducing plastic deformation. Thus it can effectively eliminate welding residual tensile stress and improve fatigue capability of welding joints. The two kinds of welding experiment of 12Cr2Ni4A were designed to prove it. The experimental results showed that LSP has abroad application prospects in post-processing welding field.

scholarly journals Effects of laser shock processing, solid solution and aging, and cryogenic treatments on microstructure and thermal fatigue performance of ZCuAl10Fe3Mn2 alloy

China Foundry ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 155-162
Author(s):  
Guang-lei Liu ◽  
Yu-hao Cao ◽  
Lu-xin Shi ◽  
Meng-jie Zhang ◽  
Zhi-qiang Ye ◽  
...  
Keyword(s):  
Solid Solution ◽  
Thermal Fatigue ◽  
Fatigue Performance ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

Prediction of residual stress induced by laser shock processing based on artificial neural networks for FGH4095 superalloy

2021 ◽  
Vol 286 ◽  
pp. 129269
Author(s):  
Jiajun Wu ◽  
Yinghao Li ◽  
Jibin Zhao ◽  
Hongchao Qiao ◽  
Ying Lu ◽  
...  
Keyword(s):  
Neural Networks ◽  
Residual Stress ◽  
Artificial Neural Networks ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Artificial Neural ◽  
Shock Processing

Forced vibration analysis of blade after selective laser shock processing based on Timoshenko’s beam theory

2020 ◽  
Vol 243 ◽  
pp. 112249 ◽  
Author(s):  
Peilin Fu ◽  
Jianghong Yuan ◽  
Xu Zhang ◽  
Guozheng Kang ◽  
Ping Wang ◽  
...  
Keyword(s):  
Forced Vibration ◽  
Vibration Analysis ◽  
Beam Theory ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Forced Vibration Analysis ◽  
Shock Processing

Influence of Laser Shock Processing on the Weld Line and Finite Element Simulation

2011 ◽  
Vol 464 ◽  
pp. 627-631
Author(s):  
Jie Zhang ◽  
Ai Hua Sun ◽  
Le Zhu ◽  
Xiang Gu
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Welding Residual Stress ◽  
Laser Shock ◽  
Analysis Software ◽  
Laser Shock Processing ◽  
Element Analysis ◽  
Welding Line ◽  
Simulation Results ◽  
Shock Processing

Welding residual stress is one of the main factors that affect the strength and life of components. In order to explore the effect on residual stress of welding line by laser shock processing, finite element analysis software ANSYS is used to simulate the welding process, to calculate the distribution of welding residual stress field. On this basis, then AYSYS/LS-DYNA is used to simulate the laser shock processing on welding line. Simulation results show that residual stress distributions of weld region, heat-affected region and matrix by laser shock processing are clearly improved, and the tensile stress of weld region effectively reduce or eliminate. The simulation results and experimental results are generally consistent, it offer reasons for parameter optimization of welding and laser shock processing by finite element analysis software.

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