From Incident Laser Pulse to Residual Stress: A Complete and Self-Closed Model for Laser Shock Peening

2006 ◽  
Author(s):  
Benxin Wu ◽  
Yung C. Shin
Keyword(s):  
Model Simulation ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Plasma Model ◽  
Corrosion Properties ◽  
Closed Model ◽  
Mechanics Model ◽  
Incident Laser Pulse ◽  
Shock Peening ◽  
Improve Fatigue

Laser shock peening (LSP) is emerging as a competitive alternative technology to classical treatments to improve fatigue and corrosion properties of metals for a variety of important applications. LSP is often performed under a water confinement regime (WCR), which involves several complicated physical processes. A complete and self-closed LSP model is presented in this paper, which requires a sequential application of three sub models: a breakdown-plasma model, a confined-plasma model, and a finite element mechanics model. Simulation results are compared with experimental data in many aspects under a variety of typical LSP conditions, and good agreements are obtained.

From Incident Laser Pulse to Residual Stress: A Complete and Self-Closed Model for Laser Shock Peening

2006 ◽  
Vol 129 (1) ◽  
pp. 117-125 ◽  
Author(s):  
Benxin Wu ◽  
Yung C. Shin
Keyword(s):  
Model Simulation ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Plasma Model ◽  
Corrosion Properties ◽  
Closed Model ◽  
Mechanics Model ◽  
Incident Laser Pulse ◽  
Shock Peening ◽  
Improve Fatigue

Laser shock peening (LSP) is emerging as a competitive alternative technology to classical treatments to improve fatigue and corrosion properties of metals for a variety of important applications. LSP is often performed under a water confinement regime, which involves several complicated physical processes. A complete and self-closed LSP model is presented in this paper, which requires a sequential application of three submodels: a breakdown-plasma model, a confined-plasma model, and a finite element mechanics model. Simulation results are compared with experimental data in many aspects under a variety of typical LSP conditions, and good agreements are obtained.

scholarly journals Improvement of Fatigue Life of GH3039 Superalloy by Laser Shock Peening

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3849
Author(s):  
Yang Tang ◽  
MaoZhong Ge ◽  
Yongkang Zhang ◽  
Taiming Wang ◽  
Wen Zhou
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Surface Profile ◽  
Optical Microscope ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Transmission Electron ◽  
Before And After ◽  
Shock Peening ◽  
Improve Fatigue

In order to improve fatigue life of GH3039 superalloy, GH3039 superalloy sheets were treated by laser shock peening (LSP). The microstructure of GH3039 superalloy before and after LSP was characterized using an optical microscope, transmission electron microscope (TEM), and X-ray diffractometer. The fatigue life of the samples with and without LSP was investigated by fatigue experiments. Moreover, surface profile and residual stress were also examined. Experimental results indicated that the grains in the surface layer of the LSP sample were remarkably refined and reached the nanometer scale. The average surface roughness increased from 0.024 μm to 0.19 μm after LSP. The average fatigue life of the laser treated samples was 2.01 times larger than that of the untreated specimens. Additionally, mathematical statistical analysis confirms that LSP has a significant influence on the fatigue life of GH3039 superalloy. The improvement of fatigue life for the laser processed GH3039 superalloy was mainly attributed to compressive residual stress and grain refinement generated by LSP.

Grain Boundary Response of Aluminum Bicrystal Under Micro Scale Laser Shock Peening

2007 ◽  
Author(s):  
Sinisa Vukelic ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Fatigue Life ◽  
Grain Boundary ◽  
Single Crystals ◽  
Model Simulation ◽  
Element Model ◽  
Laser Shock Peening ◽  
Material Surface ◽  
Laser Shock ◽  
Micro Scale ◽  
Shock Peening

Micro scale laser shock peening (μLSP) is a process in which compressive residual stresses are induced in a material surface to improve fatigue life and wear resistance under cyclic loading. Since the diameter of the laser spot used during the process is the same order of magnitude as grain size, the effects of anisotropy and heterogeneity have to be explicitly taken into account. In this study experimental and analytic work have been done in order to investigate the bicrystal aluminum response under Gaussian loading. Effects of heterogeneity under μLSP are studied through applying laser shocks onto the grain boundary of the aluminum bicrystal. μLSP on reference single crystals have also been performed for the purpose of comparison. The orientations of the crystals in the bicrystal as well as the reference single crystals have been chosen such that an approximate plane strain condition is achieved. A finite element model has also been developed based on single crystal micromechanics and a cohesive zone interface model. Simulation results are compared with experimental findings. The potential benefit of μLSP as a surface treatment for improvement of fatigue life is also discussed.

Effect of laser shock peening on microstructure and hot corrosion of TC11 alloy

2018 ◽  
Vol 335 ◽  
pp. 32-40 ◽  
Author(s):  
Zhaopeng Tong ◽  
Xudong Ren ◽  
Yunpeng Ren ◽  
Fengze Dai ◽  
Yunxia Ye ◽  
...  
Keyword(s):  
Hot Corrosion ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening
Sign in / Sign up

Export Citation Format

Share Document