Effect of laser spot size on the residual stress field of pure Al treated by laser shock processing: Simulations

2014 ◽  
Vol 316 ◽  
pp. 477-483 ◽  
Author(s):  
F.Z. Dai ◽  
J.Z. Lu ◽  
Y.K. Zhang ◽  
D.P. Wen ◽  
X.D. Ren ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Spot Size ◽  
Laser Spot ◽  
Laser Shock ◽  
Residual Stress Field ◽  
Laser Spot Size ◽  
Laser Shock Processing ◽  
Shock Processing

The Influence of Input Variability on the Compressive Residual Stresses in 30CrMnSiNi2A via Laser Shock Processing

2012 ◽  
Vol 538-541 ◽  
pp. 1828-1832
Author(s):  
Yong Hua Wu
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Compressive Stress ◽  
Spot Size ◽  
Treatment Technique ◽  
Laser Shock ◽  
Residual Stress Field ◽  
Fatigue Wear ◽  
Laser Shock Processing ◽  
Shock Processing

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.

Simulation of Residual Stress Field of Diagonal Laser Shock Processing

2011 ◽  
Vol 271-273 ◽  
pp. 84-87 ◽  
Author(s):  
Ying Wu Fang ◽  
Ying Hong Li ◽  
Wei Feng He ◽  
Wei Jin
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Tension Stress ◽  
Treatment Technique ◽  
Laser Shock ◽  
Residual Stress Field ◽  
Laser Shock Processing ◽  
Field Formation ◽  
Laser Shock Wave ◽  
Shock Processing

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.

Investigated on Residual Stress Field of Aluminum Alloy 7050T7451 with Fastener Holes by Laser Shock Processing

2011 ◽  
Vol 189-193 ◽  
pp. 3755-3758
Author(s):  
Yin Fang Jiang ◽  
Zhi Fei Li ◽  
Jian Wen Zhang ◽  
Lei Fang
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Compressive Stress ◽  
Residual Compressive Stress ◽  
Laser Shock ◽  
Residual Stress Field ◽  
Laser Shock Processing ◽  
Hole Edge ◽  
Edge Surface ◽  
Shock Processing

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.

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 ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Laser Shock ◽  
Residual Stress Field ◽  
Laser Shock Processing ◽  
Shock Processing

Modeling of residual stress field induced in Ti–6Al–4V alloy plate by two sided laser shock processing

2015 ◽  
Vol 280 ◽  
pp. 163-173 ◽  
Author(s):  
Xingquan Zhang ◽  
Huan Li ◽  
Shiwei Duan ◽  
Xiaoliu Yu ◽  
Jianyou Feng ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Laser Shock ◽  
Residual Stress Field ◽  
Laser Shock Processing ◽  
Alloy Plate ◽  
Shock Processing

Study on the Laser Shock Processing with Square Spot of Titanium Alloy Based on ABAQUS

2015 ◽  
Vol 667 ◽  
pp. 206-212
Author(s):  
Guo He Li ◽  
Hou Jun Qi ◽  
Yu Jun Cai
Keyword(s):  
Residual Stress ◽  
Laser Energy ◽  
Plate Thickness ◽  
Spot Size ◽  
Shock Pressure ◽  
Laser Shock ◽  
Surface Residual Stress ◽  
Laser Shock Processing ◽  
Square Spot ◽  
Shock Processing

Laser shock processing is a new kind of technology to improve the physical and mechanical properties of the metal surface. It uses the high-amplitude stress wave produced by the interaction of short-pulse laser and material, to make the material produce the compressive residual stress and refinement internal structure, and lead to the improved hardness and strength of material. In this paper, the simulation of laser shocking process with square spot of Titanium alloy plate was carried out through ABAQUS. The influences of the shock time, laser energy, plate thickness and spot size on the strengthening are investigated from the view of residual stress. The results show that: There are the compression residual stress in the workpiece surface after laser shcok processing, and its amplitude is about 300-400Mpa. With the increase of shock time, the surface residual stress increases, the area and depth of strengthening zone also increase. The strengthening area becomes a circular, while the distribution of residual stress becomes unhomogeneous. The surface residual stress increases as the laser energy increasing, but the amplitude is smaller. The plate thickness does not affect the amplitude of the surface residual stress. When the shock pressure is constant, surface residual stress does not change with the spot size. However, if the laser energy is constant, due to the shock pressure will decrease with the increase of spot size. Therefore, there should be an optimized spot size when the strengthening effectiveness and efficiency are both considered.

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