Effect of laser peening area on residual stress field in small-hole specimens
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Received Date:
2013-06-28
Accepted Date:
2013-07-25
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Abstract
To investigate the effect of different laser peening area on the residual stress field in a hole specimen of 7075-T7451 aluminum alloy, the process of laser peening and residual stress distribution of the hole specimen were simulated by finite element analysis software ABAQUS. The results show that both the compressive stress of surface residual and the tensile stress of unshocked area increase as laser peening area becomes bigger,the tensile stress of unshocked area changes from 52MPa to 344MPa. The residual stress distribution along inner hole wall turns out to be worse with the increase of laser peening area, the value of the worst stress along the hole inner wall changes from the compressive stress 38MPa to the tensile stress 49MPa. Within a certain range of laser peening area, the increase of laser peening area enlarges surface compressive stress coverage and makes residual stress distribution of inner hole wall worse. For laser peening of a hole specimen, it is important to control laser peening area and the surface residual stress distribution along hole inner wall, in order to improve the fatigue resistance.
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References
|
[1]
|
SHEN Y Y, ZHAI W J.Cold extrusion family introduction of FTI's reinforcement techniques of holes[J].Civil Aircraft Design and Research, 1998(1):1-7(in Chinese). |
|
[2]
|
WANG J M, ZHOU Q L, JIANG Y F, et al. Numerical simulation of sheet deformation by hollow laser shock [J].Laser Technology, 2012, 36(6):727-730(in Chinese). |
|
[3]
|
CHARLES M, TAO W, LIN Y, et al. Laser shock processing and its effects on micro-structure and properties of metal alloys: a review [J].International Journal of Fatigue, 2002, 24(10): 1021-1036. |
|
[4]
|
PEYRE P,FABBRO R,MERRIEN P, et al. Laser shock processing of aluminum alloys application to high cycle fatigue behavior[J].Materials Science and Engineering,1996,A210(1/2):102 -113. |
|
[5]
|
LUONG H, HILL M R.The effects of laser peening and shot peening on high cycle fatigue in 7050-T7451 aluminum alloy [J]. Materials Science and Engineering,2010,A527(3):699-707. |
|
[6]
|
WU X Q,HUANG C G,SONG H W.Parameters analysis of residual stress induced by laser shock processing [J].Chinese Journal of Lasers, 2010, 37(10):2632-2637(in Chinese). |
|
[7]
|
ZOU Sh K, CAO Z W. Laser peening of aluminum alloy 7050 with fastener holes [J]. Chinese Optics Letters,2008,6(2):116-119. |
|
[8]
|
JIANG Y F, ZHANG J W, JING R,et al. Analysis of the residual stress field in hole specimen by laser shock processing with different power density[J]. Laser & Infrared, 2012, 42(8):866-869(in Chinese). |
|
[9]
|
ZHOU J Zh, ZHOU M, XIAO A M. Study of the effects of overlay thickness and flexibility on laser shock processing [J]. Applied Laser, 2002, 22(1):7-9(in Chinese). |
|
[10]
|
HUANG Sh, ZHOU J Zh, SHENG J, et al.Effects of laser peening with different coverage areas on fatigue crack growth properties of 6061-T6 aluminum alloy[J]. Tribology International, 2013,47:292-299. |
|
[11]
|
ZHANG H, YU Ch Y, WU H X, et al. Laser shock processing of small hole [J]. Acta Armamentarii, 2001,22(3):330-333(in Chinese). |
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