scholarly journals Relaxation Behaviour of Laser Peening Residual Stress due to Mechanical Loading on Aluminum Alloy

2011 ◽  
Vol 60 (7) ◽  
pp. 617-623 ◽  
Author(s):  
Daisuke MIYASHITA ◽  
Kazuya TAKEDA ◽  
Shin-ich OHYA ◽  
Yuji SANO ◽  
Toshiyuki SAITO ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Mechanical Loading ◽  
Laser Peening ◽  
Relaxation Behaviour

Fatigue Performance of Laser Peened 7050-T7451 Aluminum Alloy

2006 ◽  
Author(s):  
Adrian T. DeWald ◽  
Harold Luong ◽  
John E. VanDalen ◽  
Michael R. Hill
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Fatigue Testing ◽  
Fatigue Performance ◽  
Laser Peening ◽  
Metallic Materials ◽  
Stress Distributions ◽  
Life Data ◽  
Slitting Method ◽  
Life Improvement

Laser peening is an emerging technology for the surface treatment of metallic materials that is capable of enhancing resistance to fatigue failure. This paper presents results quantifying the effects of laser peening on residual stress and fatigue performance of samples machined from 7050-T7451 aluminum alloy. Residual stress distributions were measured for treatment with different laser peening parameter sets using the slitting method. For particular laser peening parameter sets, stress versus life data were generated over a range of applied loads and compared with as-machined and shot peened results. Two different sample types were used for fatigue testing: smooth bend bars and notched bend bars. In general, laser peening produced a fatigue life improvement of approximately 3 to 6 relative to as machined samples and 1.5 to 2 relative to shot peened samples over the range of stress levels tested.

The Fatigue Properties of Laser Shock Processed Aluminum Alloy 7050

2007 ◽  
Author(s):  
Shikun Zou ◽  
Ziwen Cao
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Fatigue Life ◽  
Plastic Strain ◽  
Base Material ◽  
Fatigue Properties ◽  
Hole Drilling ◽  
Drilling Process ◽  
Laser Peening ◽  
Laser Shock

In order to develop the application of laser shock processing (also named laser peening or LSP in short) as a strengthening technology for 7050 aluminum alloy fastener holes, the fatigue properties of laser shock-processed aluminum alloy specimens were investigated. At first, the dislocation density and surface residual stress induced in the shock affected zone was characterized and compared with that of the base material. Then, the fatigue specimens with stress-concentration hole (notch) were treated by LSP. The fatigue life of LSP-treated specimens were measured and compared with that of specimens made from base material without LSP. Fatigue tests were taken under special flight spectrum loading condition for mid-airframe. The results indicated that laser peening improved the fatigue life of all specimens tested. Specimens treated by LSP before hole-drilling had longer fatigue life than those specimens treated by LSP after hole-drilling. At last, the difference of both sequences was investigated by analyzing the plastic strain and residual stress induced by LSP. LSP induced both plastic strain and deformation at the surface layer. The plastic strain induced by LSP was shown to produce harmful orifices with sharp-angle near the edge of hole. The residual stress induced by LSP appears to remain compressive even after the hole-drilling process. In average, the fatigue life of specimens treated by LSP before hole-drilling was found to be 173% longer than that of untreated samples and approaching the life enhancement factor demonstrated by rod extrusion method (on specimens with large diameter holes).

Stability of residual stress induced by laser peening under cyclic mechanical loading

2011 ◽  
Vol 2 (1) ◽  
pp. 42-50 ◽  
Author(s):  
Yuji Sano ◽  
Koichi Akita ◽  
Kazuya Takeda ◽  
Rie Sumiya ◽  
Toshiyuki Tazawa ◽  
...  
Keyword(s):  
Residual Stress ◽  
Mechanical Loading ◽  
Laser Peening

ICONE19-43979 The Effect of Mechanical Loading on Residual Stress Induced by Laser Peening

2011 ◽  
Vol 2011.19 (0) ◽  
pp. _ICONE1943-_ICONE1943
Author(s):  
Toshiyuki Tazawa ◽  
Rie Sumiya ◽  
Chihiro Narazaki ◽  
Toshiyuki Saito
Keyword(s):  
Residual Stress ◽  
Mechanical Loading ◽  
Laser Peening

Double-pulse femtosecond laser peening of aluminum alloy AA5038: Effect of inter-pulse delay on transient optical plume emission and final surface micro-hardness

2016 ◽  
Vol 109 (21) ◽  
pp. 211902 ◽  
Author(s):  
E. I. Ageev ◽  
V. Yu. Bychenkov ◽  
A. A. Ionin ◽  
S. I. Kudryashov ◽  
A. A. Petrov ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Femtosecond Laser ◽  
Double Pulse ◽  
Laser Peening ◽  
Micro Hardness ◽  
Pulse Delay ◽  
Final Surface ◽  
Plume Emission

scholarly journals Residual stress in butt welded 5083 aluminum alloy

1970 ◽  
Vol 20 (1) ◽  
pp. 7-13
Author(s):  
Eiji TANAKA ◽  
Katsuhiko HIRATA ◽  
Katsuji TAKEUCHI
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
5083 Aluminum Alloy
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