Optimization of Residual Stresses Induced by Multiple Laser Shock Processing

2013 ◽  
Author(s):  
Xinlong Wei ◽  
Jianxin Zhou ◽  
Xiang Ling
Keyword(s):  
Residual Stresses ◽  
Short Pulse ◽  
304 Stainless Steel ◽  
Laser Peening ◽  
Laser Shock ◽  
Impact Zone ◽  
Laser Shock Processing ◽  
Element Analysis ◽  
Shock Processing ◽  
Compressive Residual Stresses

Laser shock processing (LSP), also known as laser peening (LP), proves to be superior to conventional surface treatments such as shot peening, including deeper penetration of the residual stresses. The LSP treatment, which uses a very short pulse (ns) of intense (GW cm−2) laser beam to generate compressive residual stresses near the surface of the metallic samples, demonstrates a significant improvement of fatigue life and stress corrosion cracking resistance. In this paper, finite element analysis (FEA) combined with particle swarm optimization (PSO) method to predict the magnitude and distribution of optimized multiple LSP impacts on 304 stainless steel. The results of the simulation clearly show that optimized multiple LSP can mitigate residual stresses loss in the centre of the single impact zone and generate homogeneous compressive residual stresses at the surface. The results also reveal the optimized multiple LSP can lead to deeper penetration of the compressive residual stresses in the samples.

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.

Compressive Residual Stresses and Associated Surface Modifications Induced in Ti6Al4V by Laser Shock Processing

2016 ◽  
Vol 879 ◽  
pp. 1408-1413 ◽  
Author(s):  
J.L. Ocaña ◽  
J.L. González-Carrasco ◽  
M. Lieblich ◽  
S. Barriuso ◽  
J.A. Porro ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Point Of View ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Fundamental Point ◽  
Main Effect ◽  
Effective Technology ◽  
Shock Processing ◽  
Compressive Residual Stresses ◽  
Special Case

Laser shock processing (LSP) is increasingly applied as an effective technology for the improvement of metallic materials’ mechanical and surface properties in different types of components, mostly as a means of enhancement of their fatigue life behavior. As reported in previous contributions by the authors, a main effect resulting from the application of the LSP technique consists in the generation of relatively deep compression residual stresses fields into metallic components allowing an improved mechanical behaviour. In this paper, the special case of Ti6Al4V alloy is considered from a more fundamental point of view, with specific consideration of the microstructural changes and residual stresses fields justifying those macroscopic effects. From a concrete point of view, the effect of the application of different typical LSP intensities on the microstructure and residual stresses fields introduced in this material and their possible correlation to the associated surface effects are analyzed.

High level compressive residual stresses produced in aluminum alloys by laser shock processing

2005 ◽  
Vol 252 (4) ◽  
pp. 883-887 ◽  
Author(s):  
G. Gomez-Rosas ◽  
C. Rubio-Gonzalez ◽  
J.L Ocaña ◽  
C. Molpeceres ◽  
J.A. Porro ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Residual Stresses ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
High Level ◽  
Shock Processing ◽  
Compressive Residual Stresses

scholarly journals Induction of Engineered Residual Stresses Fields and Associate Surface Properties Modification by Short Pulse Laser Shock Processing

2010 ◽  
Vol 638-642 ◽  
pp. 2446-2451 ◽  
Author(s):  
J.L. Ocaña ◽  
Miguel Morales ◽  
J.A. Porro ◽  
M. Blasco ◽  
C. Molpeceres ◽  
...  
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Surface Properties ◽  
Short Pulse ◽  
Point Of View ◽  
Experimental Point ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Stress Profiles ◽  
Shock Processing

Laser shock processing (LSP) is consolidating as an effective technology for the improvement of metallic materials surface properties involving their fatigue life. The main acknowledged advantage of the LSP technique consists on its capability of inducing a relatively deep compression residual stresses field into metallic alloy pieces allowing an improved mechanical behaviour, explicitly the life improvement of the treated specimens against wear, crack growth and stress corrosion cracking. Progress accomplished by the authors in the line of practical development of the LSP technique at an experimental level, aiming its integral assessment from an interrelated theoretical and experimental point of view, is presented in this paper. Concretely, experimental results on the residual stress profiles and associated surface properties modification successfully reached in typical materials (especially Al and Ti alloys) under different LSP irradiation conditions are presented, a correlated analysis of the residual stress profiles obtained under different irradiation strategies and the evaluation of the corresponding induced surface properties as roughness and wear resistance being also presented. Through a coupled theoretical- experimental analysis the real possibilities of the LSP technique as a possible substitutive of related traditional surface modification techniques as, for example, shot peening.

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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