Investigation of effect of one-side and two-side laser shock processing on aluminum alloy small-hole specimens

JIANG Yao; JIANG Yinfang; LI Zhen; YU Jiang; LIU Qiuge; QIAN Junkang

doi:10.7510/jgjs.issn.1001-3806.2016.01.020

In order to investigate the effect of one-side and two-side laser shock processing (LSP) on 7050-T7451 aluminum alloy small-hole specimens, the residual compressive stress distribution was analyzed with finite element analysis software ABAQUS and the residual stress curves and fracture morphology were compared. The results show that the residual compressive stress introduced by two-side LSP is 120MPa, larger than that induced by one-side LSP and the front and reserve side stress distribution of two-side LSP is more reasonable. The distance from fatigue source group to treatment side after one-side LSP is 2.54mm and deviates from the dimension centre. Fatigue source group locates in the middle of the thickness after two-side LSP. Fatigue lives increase 53.3% and 156.2% after one-side and two-side LSP respectively. The research shows the guidance to parameter selection of one-side and two-side LSP.

Investigation of effect of one-side and two-side laser shock processing on aluminum alloy small-hole specimens

Corresponding author: JIANG Yinfang, yfjiang@mail.ujs.edu.cn;

1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

Received Date: 2014-12-09

Accepted Date: 2015-03-16

Available Online: 2016-01-25

Abstract: In order to investigate the effect of one-side and two-side laser shock processing (LSP) on 7050-T7451 aluminum alloy small-hole specimens, the residual compressive stress distribution was analyzed with finite element analysis software ABAQUS and the residual stress curves and fracture morphology were compared. The results show that the residual compressive stress introduced by two-side LSP is 120MPa, larger than that induced by one-side LSP and the front and reserve side stress distribution of two-side LSP is more reasonable. The distance from fatigue source group to treatment side after one-side LSP is 2.54mm and deviates from the dimension centre. Fatigue source group locates in the middle of the thickness after two-side LSP. Fatigue lives increase 53.3% and 156.2% after one-side and two-side LSP respectively. The research shows the guidance to parameter selection of one-side and two-side LSP.

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Reference (15)

[1]	MONTROSS C S, WEI T, YE L, et al. Laser shock processing and its effects on microstructure and properties of metal alloys:a review[J]. International Journal of Fatigue, 2002, 24(10):1021-1036.
[2]	LU J Z, LUO K Y, ZHANG Y K,et al. Effect of laser shock processing and strain rate on tensile property of LY2 aluminum alloy[J]. Materials Science and Engineering, 2010, A527(2):730-735.
[3]	GAO Y K. Improvement of fatigue property in 7050-T7451 aluminum alloy by laser peening and shot peening[J]. Materials Science and Engineering, 2011,A528(10):3823-3828.
[4]	QIAN X M, JIANG Y F, GUAN H B,et al. Research and application of strengthening technology for fastening holes of aircraft structures[J]. Journal of Mechanical Strength, 2011, 33(5):749-753(in Chinese).
[5]	REN X D, ZHAN Q B, YANG H M,et al. The effects of residual stress on fatigue behavior and crack propagation from laser shock processing-worked hole[J]. Materials Design, 2013, 44(2):149-154.
[6]	ZHANG L, LU J Z, ZHANG Y K,et al. Effects of different shocked paths on fatigue property of 7050-T7451 aluminum alloy during two-sided laser shock processing[J]. Materials Design, 2011, 32(2):480-486.
[7]	JIANG Y F, DING B, CHEN Zh J, et al. Effect of laser peening area on residual stress field in small-hole specimens[J]. Laser Technology, 2014,38(2):201-204(in Chinese).
[8]	LIU Q, YANG C H, DING K, et al. The effect of laser power density on the fatigue life of laser-shock-peened 7050 aluminium alloy[J]. Fatigue and Fracture of Engineering Materials and Structures, 2007, 30(11):1110-1124.
[9]	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).
[10]	ZOU Sh K, CAO Z W. Laser peening of aluminum alloy 7050 with fastener holes[J].Chinese Optics Letter, 2008,6(2):116-119.
[11]	LUO K Y, CHEN Q, LV C, et al. Thickness analysis of two-sided simultaneous laser shock processing on AM50 alloy[J]. Chinese Journal of Lasers, 2014,41(1):0103003(in Chinese).
[12]	FAN Y, WANG S B, WU H X, et al. Research of residual compressive stress induced by laser shock processing on 7050 aerial aluminum alloy[J]. Applied Laser, 2003, 23(1):6-9(in Chinese).
[13]	ZHOU J Zh, YANG X D, HUANG Sh, et al. Residual stress field of ZK60 specimen with central hole induced by both-side laser shot peening[J]. Chinese Journal of Lasers, 2010,37(7):1850-1855(in Chinese).
[14]	VASU A, HU Y X, GRANDHI R V. Differences in plasticity due to curvature in laser peened components[J]. Surface Coatings Technology, 2013, 235(2):648-656.
[15]	ACHINTHA M, NOWELL D. Eigenstrain modelling of residual stresses generated by laser shock peening[J]. Journal of Materials Processing Technology, 2011,211(6):1091-1101.

Investigation of effect of one-side and two-side laser shock processing on aluminum alloy small-hole specimens

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