Dynamic Material Response of Aluminum Single Crystal Under Microscale Laser Shock Peening

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Sinisa Vukelic ◽  
Youneng Wang ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Residual Stresses ◽  
Single Crystals ◽  
Electron Backscatter Diffraction ◽  
Target Material ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Laser Target ◽  
Aluminum Single Crystal ◽  
Anisotropic Mechanical Properties ◽  
Shock Peening

The process of laser shock peening induces compressive residual stresses in a material to improve material fatigue life. For micron sized laser beams, the size of the laser-target interaction zone is of the same order of magnitude as the target material grains, and thus the target material must be considered as being anisotropic and inhomogeneous. Single crystals are chosen to study the effects of the anisotropic mechanical properties. It is also of interest to investigate the response of symmetric and asymmetric slip systems with respect to the shocked surface. In the present study, numerical and experimental aspects of laser shock peening on two different crystal surfaces (110) and (11¯4) of aluminum single crystals are studied. Lattice rotations on the top surface and cross section are measured using electron backscatter diffraction, while residual stress is characterized using X-ray microdiffraction. A numerical model has been developed that takes into account anisotropy as well as inertial terms to predict the size and nature of the deformation and residual stresses. Obtained results were compared with the experimental finding for validation purpose.

Laser shock peening of copper poly- and single crystals

2021 ◽  
Vol 174 ◽  
pp. 111037
Author(s):  
Jiří Kubásek ◽  
Orsolya Molnárová ◽  
Jaroslav Čapek ◽  
Kristína Bartha ◽  
Jakub Čížek ◽  
...  
Keyword(s):  
Single Crystals ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

Characterization of Plastic Deformation Induced by Microscale Laser Shock Peening

2004 ◽  
Vol 71 (5) ◽  
pp. 713-723 ◽  
Author(s):  
Hongqiang Chen ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Plastic Deformation ◽  
Single Crystal ◽  
Crystal Lattice ◽  
Electron Backscatter Diffraction ◽  
Fem Analysis ◽  
Copper Sample ◽  
Laser Shock Peening ◽  
Lattice Rotation ◽  
Laser Shock ◽  
Shock Peening

Electron backscatter diffraction (EBSD) is used to investigate crystal lattice rotation caused by plastic deformation during high-strain rate laser shock peening in single crystal aluminum and copper sample on 110¯ and (001) surfaces. New experimental methodologies are employed which enable measurement of the in-plane lattice rotation under approximate plane-strain conditions. Crystal lattice rotation on and below the microscale laser shock peened sample surface was measured and compared with the simulation result obtained from FEM analysis, which account for single crystal plasticity. The lattice rotation measurements directly complement measurements of residual strain/stress with X-ray micro-diffraction using synchrotron light source and it also gives an indication of the extent of the plastic deformation induced by the microscale laser shock peening.

Prediction and characterization of residual stresses from laser shock peening

2012 ◽  
Vol 36 (1) ◽  
pp. 96-108 ◽  
Author(s):  
Robert A. Brockman ◽  
William R. Braisted ◽  
Steven E. Olson ◽  
Richard D. Tenaglia ◽  
Allan H. Clauer ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

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 An Approach to Predict the Residual Stress-Depth-Profile of Thin Sheet Metal Processed by Laser Shock Peening Without Coating

2021 ◽  
Vol 1135 (1) ◽  
pp. 012025
Author(s):  
Tobias Valentino ◽  
Andreas Stephen ◽  
Tim Radel
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Depth Profile ◽  
Thin Sheet ◽  
Laser Shock Peening ◽  
Stress Profile ◽  
Thin Sheets ◽  
Laser Shock ◽  
Process Step ◽  
Shock Peening

Abstract For conventional laser shock peening, the positive influence of compressive residual stresses on fatigue strength is well understood. To protect the material’s surface from ablation, a sacrificial layer is applied. This, however, leads to an additional process step, which deteriorates its economic efficiency. Thus, laser shock peening without coating (LPwC) is more frequently investigated for industrial applications. However, LPwC increases the thermal impact on the material, which may provoke tensile residual stresses in the surface region. In this regard, understanding the influence of LPwC on the residual stress state and deriving a suitable state, e.g., for subsequent applications or forming operations, result in a design of experiment with numerous residual stress measurements. Residual stress-depth-profiles obtained by X-ray diffraction are time-consuming and cost intensive. Hence, a model is proposed to predict the residual stress-depth-profile of LPwC-processed thin sheets. The analytical model is based on the source stress model and uses experimental results, namely hardness as well as shape change measurements. Sheets made of X5CrNi18-10 and with a thickness of 1 mm are LPwC-processed with a nanosecond fiber laser. In the thermally dominated area where tensile residual stresses are present, the model agrees well with the experimental measurements. Moreover, it is revealed that LPwC leads to a saturation of residual stress level maximum and depth in dependence of pulse energy, repetition rate and number of repetitions. Subsequently, the model is used for tailoring the stress profile of thin sheets by LPwC for subsequent bottom bending.

Neutron Diffraction Analysis of Residual Stresses Induced by Laser Shock Peening

2005 ◽  
Vol 490-491 ◽  
pp. 263-268
Author(s):  
I. Chaieb ◽  
Chedly Braham ◽  
Patrice Peyre ◽  
E. Labbe ◽  
Alain Lodini
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
Diffraction Analysis ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Neutron Diffraction Analysis ◽  
Shock Peening

The Effects of Laser Shock Peening on Microstructure and Properties of Metals and Alloys: A Review

2011 ◽  
Vol 347-353 ◽  
pp. 1596-1604 ◽  
Author(s):  
Jin Liang Hu ◽  
Jun Lou ◽  
Hong Chan Sheng ◽  
Shu Hui Wu ◽  
Guo Xing Chen ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Processing Parameters ◽  
Metals And Alloys ◽  
Laser Shock Peening ◽  
Current Status ◽  
Laser Shock ◽  
Excellent Performance ◽  
Microstructure And Properties ◽  
Attractive Candidate ◽  
Shock Peening

This study reviews the current status of the understanding and development of laser shock peening(LSP) on various metals. The influence of processing parameters on residual stresses, microstructure and properties are discussed. Special emphasis is placed on analyzing their underlying interrelationship between the LSP induced modifications. Finally, recommendations for further study are listed. Results indicate that the combination of uniquely flexible process and excellent performance makes the laser shock peening an attractive candidate for surface optimization applications.

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