Experimental assessment of the influence of irradiation parameters on surface deformation and residual stresses in laser shock processed metallic alloys

2004 ◽  
Vol 238 (1-4) ◽  
pp. 501-505 ◽  
Author(s):  
J.L. Ocaña ◽  
C. Molpeceres ◽  
J.A. Porro ◽  
G. Gómez ◽  
M. Morales
Keyword(s):  
Residual Stresses ◽  
Surface Deformation ◽  
Metallic Alloys ◽  
Laser Shock ◽  
Experimental Assessment

Study of Residual Stresses Introduced by Laser Shock Peening in Wide Chord Fan Blades by Neutron and Synchrotron Diffraction

2004 ◽  
Vol 12 (1-3) ◽  
pp. 207-211 ◽  
Author(s):  
A. King ◽  
A.D. Evans ◽  
M. Preuss ◽  
P.J. Withers ◽  
C. Woodward
Keyword(s):  
Residual Stresses ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Synchrotron Diffraction ◽  
Shock Peening

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.

Residual Stress in Bone: A Parametric Study

2008 ◽  
Author(s):  
A. Hizal ◽  
B. Sadasivam ◽  
D. Arola
Keyword(s):  
Residual Stress ◽  
Particle Size ◽  
Residual Stresses ◽  
Material Removal ◽  
Surface Deformation ◽  
Radius Of Curvature ◽  
Near Surface ◽  
Size And Shape ◽  
Air Jet ◽  
Particle Size And Shape

A preliminary study was conducted to evaluate the parametric dependence of the residual stress distributions in bone that result from an abrasive air-jet surface treatment. Specifically, the influence of particle size and shape used in the treatment on the residual stress, propensity of embedding particles and material removal were studied. Rectangular beams of cortical bone were prepared from bovine femurs and treated with aluminum oxide and glass particles with different treatment angles. Residual stresses within the bone were quantified in terms of the radius of curvature of the bone specimens measured before and after the treatments, as well as a function of time to quantify decay in the stress. The sub-surface distribution was also examined using the layer removal technique. Results showed that the particle size and shape could be used to control the amount of material removal and the magnitude of residual stress within the treated surfaces. An increase in size of the glass particles resulted in an increase in the residual stress and a decrease in material removed during the treatment. The magnitude of residual stress ranged from 22 MPa to nearly 44 MPa through modulation of the particle qualities (size and shape). A microscopic examination of the treated surfaces suggests that the residual stresses resulted primarily from near-surface deformation.

Effects of Sheet Thickness on Residual Stress Distribution by Laser Shock Processing of 7050-T7451 Aluminum Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 3778-3781
Author(s):  
Yin Fang Jiang ◽  
Lei Fang ◽  
Zhi Fei Li ◽  
Zhen Zhou Tang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Sheet Thickness ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Element Analysis ◽  
Finite Element Software ◽  
Shock Processing

Laser shock processing is a technique similar to shot peening that imparts compressive residual stresses in materials for improved fatigue resistance. Finite element analysis techniques have been applied to predict the residual stresses from Laser shock processing. The purpose of this paper is to investigate of the different sheet thickness interactions on the stress distribution during the laser shock processing of 7050-T7451 aluminum alloy by using the finite element software. The results indicate that the sheet thickness has little effects on the compression stress in the depth of sheet, but great impacts on the reserve side.

Residual Stress Formation at Arbitrary Types of Rollers during the Running in Process

2012 ◽  
Vol 548 ◽  
pp. 372-376
Author(s):  
O.P. Muraviev ◽  
M.R. Sikhimbayev ◽  
B.N. Absadykov ◽  
B.S. Arymbekov ◽  
Y.O. Tkacheva
Keyword(s):  
Residual Stresses ◽  
Surface Deformation ◽  
Calculated Data ◽  
Sharp Decrease ◽  
The Body ◽  
Experimental Investigations ◽  
Body Parts ◽  
Adequate Treatment ◽  
Significance Level ◽  
Plastic Surface

In the article the results of the design and analysis of mathematical model for determining residual stresses in the surface of layer at parts processed by plastic surface deformation (PSD) in which the rollers having an arbitrary shape and size. It is shown that for the calculation of stresses in the surface of layer it should not be defined by them at a forcing point but by a function of contact stresses. Integral equations are obtained for calculating the stresses in the body parts at the processing of PSD rolls of arbitrary size and shape of the stress distribution over the contact area. We found that the tangential and radial residual stresses depend on the magnitude of the force F and its distance from the point at which the voltage is considered in detail. There is a sharp decrease in the influence of forces on the stress in the surface of the part of the distance to the point in question.The calculated data generated by the proposed method are highly matches with data during the experimental investigations. Maximum deviations of the calculated values do not exceed the errors of the experiments and adequate treatment of each other at a significance level of 0.05.

Laser Shock Processing of Titanium Alloy Blade and FEM Simulation

2013 ◽  
Vol 456 ◽  
pp. 125-128
Author(s):  
Bing Yan ◽  
Rui Wang
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Residual Stresses ◽  
Fem Simulation ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Tc4 Titanium Alloy ◽  
Compressive Stresses ◽  
Maximum Value ◽  
Shock Processing

The aim of this article is to analyze the residual stresses field in a TC4 titanium alloy blade by laser shock processing (LSP).LSP is a new surface processing technology, it uses the laser shock wave to act on the surface of the target and form residual compressive stresses field. The ABAQUS software is applied to simulate the LSP of TC4 titanium alloy blade, and the distributions of the residual stresses field are analysed.After single LSP,the maximum value of residual stress on the surface is 309 MPa.The residual stresses on the surface increase first and then decrease.The residual stresses at the depth continue decreasing with the increase of the depth.After multiple LSP,the maximum value of residual stress on the surface is increased and plastically affected depth is increased.

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