The effects of laser shock processing on the residual stresses of the LY2 aluminium alloy samples with elliptical spot (long axis length, 12 mm; short axis length, 3 mm) were experimentally investigated, and the effects of the overlapping rate on the residual stresses were simulated using the Abaqus software. The simulated residual stresses were basically in agreement with the measured data, and the relationship between the magnitude and uniformity of residual stress and the overlapping rate was also addressed. Results show that the largest stress magnitudes are located on the top surface of the sample, and the greatest uniformity is achieved by the overlapping of elliptical laser spots. The overlapping rate is critical for the uniformity of the residual stress across the surface. Within a certain impact number range of one to four times, increasing the shocked number can increase the magnitude of residual stress near the surface but not effectively increase the plastically affected depth.
YilbasB. S. and ArifA. F. M.: ‘Laser shock processing of aluminum: model and experimental study’, J. Phys. D, Appl. Phys., 2007, 40, 6740–6747.
2.
MontrossC. S. , YeL. , WeiT. , ClarkG. and MaiY. W.: ‘Laser shock processing and its effects on microstructure and properties of metal alloys: a review’, Int. J. Fatigue, 2002, 24, 1021–1036.
3.
ZhangY. K. , HuC. L. , CaiL. , YangJ. C. and ZhangX. R.: ‘Mechanism of improvement on fatigue life of metal by laser-excited shock waves’, Appl. Phys. A, 2001, 72A, (2), 113–116.
4.
YangC. H. , HodgsonP. D. , LiuQ. C. and YeL.: ‘Geometrical effects on residual stresses in 7050-T7451 aluminum alloy rods subject to laser shock peening’, J. Mater. Process. Technol., 2008, 201, 303–309.
5.
Rubio-GonzálezC. , OcañaJ. L. and Gomez-RosasG.: ‘Effect of laser shock processing on fatigue crack growth and fracture toughness of 6061-T6 aluminum alloy’, Mater. Sci. Eng. A, 2004, A386, 291–295.
6.
ZhangY. K. , GuY. Y. , ZhangX. Q. and ZhouJ.: ‘Study of mechanism of overlay acting on laser shock waves’, J. Appl. Phys., 2006, 100, 103517-1.
7.
MarchiC. S. , ZaleskiT. , LeeS. , YangN. Y. C. and StuartB.: ‘Effect of laser peening on the hydrogen compatibility of corrosion-resistant nickel alloy’, Scr. Mater., 2008, 58, (9), 782–785.
8.
ZhangY. K. , ZhangS. Y. and CaiL.: ‘Investigation of surface qualities of laser shock-processes zones and the effect on the fatigue life of aluminum alloy’, Surf. Coat. Technol., 1997, 92, 104–107.
9.
WarrenA. W. , GuoY. B. and ChenS. C.: ‘Massive parallel laser shock peening: simulation, analysis, and validation’, Int. J. Fatigue, 2008, 30, (1), 188–197.
10.
DaneC. B. , HackelL. A. , DalyJ. and HarnssonJ.: ‘Laser peening of metals-enabling laser technology’, Adv. Mater. Process., 1997, 5, 13–27.
ZhangH. , ZhangY. K. and YuC. Y.: ‘Surface treatment of aluminum alloy by laser shock processing’, Surf. Eng., 1999, 15, 454–456.
13.
DingK. and YeL.: ‘Three-dimensional dynamic finite element analysis of multiple laser shock peening processes’, Surf. Eng., 2003, 19, 351–358.
14.
HuY. X. , YaoZ. Q. and HuJ.: ‘3-D FEM simulation of laser shock processing’, Surf. Coat. Technol., 2006, 201, 1426–1435.
15.
NallaR. K. , AltenbergerI. , NosterU. , LiuG. Y. , ScholtesB. and RitchieR. O.: ‘On the influence of mechanical surface treatments-deep rolling and laser shock peening-on the fatigue behavior of Ti–6Al–4V at ambient and elevated temperatures’, Mater. Sci. Eng. A, 2003, A355, 216–230.
16.
NikitinI. , SholtesB. , MaierH. J. and AltenbergerI.: ‘High temperature fatigue behavior and residual stress stability of laser-shock peened and deep rolled’, Scr. Mater., 2004, 50, (10), 1345–1350.
17.
HuY. X. and YaoZ. Q.: ‘FEM simulation of residual stresses induced by laser shock with overlapping laser spots’, Acta Metall. Sinica, 2008, 21, (2), 125–132.
18.
EvansA. D. , BrunoG. , KingA. and WithersP. J.: ‘Laser shock peening for aerospace Ti–6Al–4V alloy: a residual stress study’, Annual Report of the Institut Laue-Langevin (ILL), Grenoble, France, ILL, 2002, 42–43.
19.
ClauerH. A. , WaltersC. T. and FordS. C.: ‘The effects of laser shock processing on the fatigue properties of -T3 aluminum’, in ‘Lasers in materials processing’, (ed. MetzbowerE. A.), 7–22; 1983, Metals Park, OH, American Society for Metals.
20.
PeyreP. and FabbroR.: ‘Laser shock processing: a review of the physics and applications’, Opt. Quantum Electron., 1995, 27, 1213–1219.
21.
ZhangY. K. , ZhangX. R. and WangX. D.: ‘Elastic properties modification in aluminum alloy induced by laser-shock processing’, Mater. Sci. Eng. A, 2001, A297, 138–143.
DingK. and YeL.: FEM simulation of two sided laser shock peening of thin sections of Ti -6Al-4V alloy, Sur. Eng., 2003, 19, 127–133.
24.
YakimetsI. , RichardC. , BerangerG. and PeyreP.: ‘Laser peening processing effect on mechanical and tribological properties of rolling steel 100Cr6’, Wear, 2004, 256, (3–4), 311–320.
