Experimental Study of Residual Stress Formation Mechanism of 7050 Aluminum Alloy Sheet by Laser Shock Processing

2016 ◽  
Vol 43 (7) ◽  
pp. 0702008
Author(s):  
曹宇鹏 Cao Yupeng ◽  
徐影 Xu Ying ◽  
冯爱新 Feng Aixin ◽  
花国然 Hua Guoran ◽  
周东呈 Zhou Dongcheng ◽  
...  
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Aluminum Alloy ◽  
Alloy Sheet ◽  
Laser Shock ◽  
Aluminum Alloy Sheet ◽  
Laser Shock Processing ◽  
7050 Aluminum Alloy ◽  
Stress Formation ◽  
Shock Processing

Study on Deformation Behaviors of LD31 (6063) Aluminum Alloy Sheet by Oblique Angle Laser Shock

2006 ◽  
Vol 315-316 ◽  
pp. 511-515 ◽  
Author(s):  
Yong Kang Zhang ◽  
Dun Wen Zuo ◽  
Lei Zhang ◽  
De Jun Kong ◽  
Jian Zhong Zhou ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Laser Beam ◽  
Alloy Sheet ◽  
Normal Direction ◽  
Work Piece ◽  
Laser Shock ◽  
Aluminum Alloy Sheet ◽  
Oblique Angle ◽  
Laser Shock Processing ◽  
Shock Processing

Laser shock forming of metal sheet usually effects on the surface of work-piece in normal direction by laser beam, and produces shock wave force which is vertical to the surface of work-piece. But it is difficult to shock in normal direction during processing on the surface of forming camber, so it needs to study on oblique angle laser shock processing. LD31 forging aluminum alloy sheet is shocked by Nd-glass laser in the paper, model and mode of oblique angle laser shock processing is found, and transmitting characteristics of plasma stress wave is discussed. The experiment results show that the angle between input beam and sample normal is bigger, component of forces that parallel with sample surface is bigger, the deformation eccentricity is bigger and bigger. When the angle is bigger, the area of laser beam spot becomes bigger too, energy density becomes smaller, deformation becomes shallower.

Formation Mechanism of Residual Stress Hole on 7050 Aluminum Alloy Sheet Sample Under Laser Shock

2016 ◽  
Vol 43 (11) ◽  
pp. 1102003
Author(s):  
曹宇鹏 Cao Yupeng ◽  
周东呈 Zhou Dongcheng ◽  
冯爱新 Feng Aixin ◽  
花国然 Hua Guoran ◽  
蒋苏州 Jiang Suzhou
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Formation Mechanism ◽  
Alloy Sheet ◽  
Laser Shock ◽  
Aluminum Alloy Sheet ◽  
7050 Aluminum Alloy ◽  
Sheet Sample

Experimental Study on Residual Stress of K24 Superalloy in Laser Cladding Zone by Laser Shock Processing

2007 ◽  
Vol 353-358 ◽  
pp. 453-456
Author(s):  
Jin Zhon Lu ◽  
Yong Kang Zhang ◽  
Y.Y. Xu ◽  
De Jun Kong ◽  
H.B. Yao ◽  
...  
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Laser Cladding ◽  
Compressive Residual Stress ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
X Ray ◽  
Tempering Treatment ◽  
Shock Processing ◽  
Improve Fatigue

The surface of K24 superalloy was processed with laser cladding & LSP (laser shock processing). Residual stress in the laser cladding zone by LSP was measured with X-ray stress tester X-350A, and the variational rule of residual stress in the cladding zone by tempering treatment of 8 hours and 16 hours was measured, respectively. The experimental results show that compressive residual stress of K24 superalloy surface by laser cladding & laser shock processing is above -600MPa, which exceeds residual stress by mechanical peening treatment; and there is no clear effect on residual stress by tempering treatment at 600°C for 8 hours and 16 hours, respectively, which can improve fatigue life of K24 superalloy.

Numerical Simulation of Fatigue Life of 7050 Aluminum Alloy Processed by Laser Shock Processing

2010 ◽  
Vol 37 (12) ◽  
pp. 3192-3195 ◽  
Author(s):  
张洁 Zhang Jie ◽  
顾祥 Gu Xiang ◽  
祝乐 Zhu Le ◽  
孙爱华 Sun Aihua
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Fatigue Life ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
7050 Aluminum Alloy ◽  
Shock Processing

Fatigue Crack Propagation Experiment and Simulation on 7050 Aluminum Alloy

2011 ◽  
Vol 464 ◽  
pp. 560-563
Author(s):  
Xu Dong Ren ◽  
Yong Zhuo Huangfu ◽  
Yong Kang Zhang ◽  
Da Wei Jiang ◽  
Tian Zhang
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Crack Propagation ◽  
Crack Growth ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
7050 Aluminum Alloy ◽  
Shock Processing

In this paper, an experiment of fatigue crack propagation in 7050 aluminum alloy was presented. Laser shock processing (LSP) is used to shock the crack surface. Compared with the specimen without LSP, the fatigue life after LSP increased greatly. The simulation of the fatigue crack growth in 7050 aluminum alloy is implemented in FRANC2D. Simulating result is in accordance with the result of the experiment well. Laser shock processing increases the fatigue life and reduce fatigue crack growth rate, it has good prospect on the study of crack arrestment.

Analysis of 7050 Aluminum Alloy Crack Growth by Laser Shock Processing

2010 ◽  
Vol 97-101 ◽  
pp. 3852-3856
Author(s):  
Xu Dong Ren ◽  
T. Zhang ◽  
Yong Kang Zhang ◽  
Da Wei Jiang ◽  
Kang Min Chen
Keyword(s):  
Aluminum Alloy ◽  
Average Length ◽  
Compact Tension ◽  
Optical Microscope ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Great Resistance ◽  
Short Cracks ◽  
7050 Aluminum Alloy ◽  
Shock Processing

Cracks were prefabricated on compact tension specimen of 7050 Aluminum alloy, which was laser shock processing(LSP) once and three times. The whole crack initiation process, distribution and size evolution on aluminum alloy was studied with replica technique and through optical microscope. It was found that without LSP, small cracks initiated at the grain boundary and grew quickly. The cracks continued growing in depth. The growth of short cracks had the trend of stop-and-go oscillation, the crack data were relatively scattered, and short cracks had short average length and grew earlier. After LSP, surface residual compressive stress restrained to the trend of crack origins where crack origins would form most easily; after origination, cracks initiated towards the processed region, but stop temporarily if encountering great resistance, and might generate additional crack origins; Moreover, the higher the level of stress created by LSP was, the fewer cracks initiated.

Effect of Laser Shock Processing on Fatigue Performance of 7075-T651 Aluminum Alloy

2010 ◽  
Vol 139-141 ◽  
pp. 430-433
Author(s):  
Rui Fang Chen ◽  
Hui Jiang ◽  
Yin Qun Hua ◽  
Yu Xiao Chen ◽  
Zhen Grong Cai
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Cyclic Load ◽  
Fatigue Testing ◽  
Cyclic Creep ◽  
Fatigue Performance ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
The Stability ◽  
Shock Processing

The effect of laser shock processing (LSP) on bending fatigue performance of 7075-T651 aluminum alloy was studied. LSP was performed on fatigue testing specimens with optimized parameters. Stress-life fatigue data were generated for both shocked and as-machined conditions. The fatigue improvements of LSP were discussed accounting for the effect of residual stress. The results show that shocked specimens exhibited significantly improved fatigue performance, with as-machined specimens having a factor of 1.6-4.4 improvement in fatigue life (depending on fatigue stress level). The stability of the residual stress induced by LSP under cyclic load was particularly investigated by means of X-ray diffraction measurements. Residual stress relaxation was observed. And the higher the cyclic load, the higher the relaxation rate. Due to the cyclic creep effect, the residual stress decreases linearly with the logarithm of the number of cycles.

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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