Effect of an absorbent overlay on the residual stress field induced by laser shock processing on aluminum samples

2006 ◽  
Vol 252 (18) ◽  
pp. 6201-6205 ◽  
Author(s):  
C. Rubio-González ◽  
G. Gomez-Rosas ◽  
J.L. Ocaña ◽  
C. Molpeceres ◽  
A. Banderas ◽  
...  
2011 ◽  
Vol 271-273 ◽  
pp. 84-87 ◽  
Author(s):  
Ying Wu Fang ◽  
Ying Hong Li ◽  
Wei Feng He ◽  
Wei Jin

Laser shock processing (LSP) is an innovative surface treatment technique. According to the theory of residual stress field formation by laser shock wave, laser overlapping shock processing of LY12CZ aluminium alloy was analyzed. The diagonal shock process is simulated by FEM using LS-DYNA codes, and the residual stress field in different angle of fall and pressure are predicted. The results indicate that the value of residual tension stress can be increased when diagonal shock, and the value of residual compressive stress will be decreased. The simulated results can provide the basis for experimental studying the diagonal laser shock processing and laser facular overlap.


2011 ◽  
Vol 189-193 ◽  
pp. 3755-3758
Author(s):  
Yin Fang Jiang ◽  
Zhi Fei Li ◽  
Jian Wen Zhang ◽  
Lei Fang

Laser shock processing (LSP) is a new technique for surface strengthening of fastener holes. The process of LSP before hole-drilling was adopted. A finite element model was established to study the effects of laser shock parameters on the residual stress field of aluminum alloy7050T7451 with Fastener Holes. The results indicate that increasing the laser power density until a fixed value results in a large peak in the hole-edge surface residual compressive stress. The hole-edge surface residual compressive stress and the depth of residual compressive stress are both increased with the increase of laser pulse width. Multiple laser shock processing can improve the residual compressive stress greatly, and with the increasing number of shot, the strengthening effect is gradually diminished.


2015 ◽  
Vol 280 ◽  
pp. 163-173 ◽  
Author(s):  
Xingquan Zhang ◽  
Huan Li ◽  
Shiwei Duan ◽  
Xiaoliu Yu ◽  
Jianyou Feng ◽  
...  

2012 ◽  
Vol 538-541 ◽  
pp. 1828-1832
Author(s):  
Yong Hua Wu

The laser shock processing(LSP) is a new surface treatment technique that induce a significant compressive residual stress field on the metal and alloys. The developed compressive stress field is beneficial to improve surface properties such as fatigue, wear, and corrosion. To improve the understanding of the shock process, investigation into the physical processes and its variability involved is necessary. This work examines the effect of LSP at different input variability to induce its compressive stress. Various factors that affect the compressive stress of the LSP are tested with a serial experimental using 30CrMnSiNi2A as workpiece. It was found that the in-depth residual stress induced by LSP were a function of laser power density,laser beam spot size, laser pulse width and pulse repetition.


2012 ◽  
Vol 460 ◽  
pp. 420-423 ◽  
Author(s):  
Wen Long Lu

The distribution of the compressive residual stresses which caused by laser shock processing is a new surface strengthening technology to improve the quality of material surface. ABAQUS is used to simulate the distribution of residual stress field impacted by the laser power densities and the spot shapes. The consequences indicate that: following the laser power intensities increasing, the reflection waves coming from the spot edges should loaded reversely, inducing the opposite deformation, leading to the “residual stress drops” phenomenon; the spot shapes also influent the converging of the reflection waves toward the center, and the residual stress drops at the center are different. This research provides a basis for a better effect of LSP with the optimization of the technological parameters and the decrease of the residual stress drops at the center of the shocked zones.


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