Research Papers

Finite Element Analysis of the Variation in Residual Stress Distribution in Laser Shock Peening of Steels

[+] Author and Article Information
Rohit Voothaluru

e-mail: rvoothal@purdue.edu

Gary J. Cheng

School of Industrial Engineering,
Purdue University,
West Lafayette, IN 47907

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received July 20, 2011; final manuscript received June 26, 2012; published online November 12, 2012. Assoc. Editor: Yong Huang.

J. Manuf. Sci. Eng 134(6), 061010 (Nov 12, 2012) (8 pages) doi:10.1115/1.4007780 History: Received July 20, 2011; Revised June 26, 2012

Laser shock peening (LSP) is a surface treatment technique similar to conventional shot peening. The laser induced plasma causes plastic deformations and compressive residual stresses that are useful for developing improved properties in the fields of resistance to fatigue, wear or stress corrosion cracking. The actual distribution of residual stresses is extremely important while designing for improved fatigue life using laser shock peening, as fatigue cracks would initiate from the weakest point in the structure. In this paper, the variations in distribution of residual stresses due to laser shock peening are studied with a focus on two materials, annealed 1053 and hardened 52100 AISI steels. A 3D finite element model was developed to study the actual distributions of the residual stresses due to laser shock peening. The effect of hardness on the distribution of the residual stresses and the presence of tensile residual stresses in the surrounding regions of the impact is analyzed. Much larger variations in the residual stress distributions were observed in case of the 1053 steel as compared to hardened 52100 steel. A comprehensive analysis of the simulation results was performed in order to address and explain this behavior. It was observed that the extent of overlap would also affect the variations in the residual stress distributions. The tensile residual stresses present in the areas surrounding the shocked region were also analyzed based upon the extent of overlap and the hardness of the material. It was observed that the ratio of peak tensile to compressive residual stresses developed in 1053 steel was much higher as compared to that in the hardened 52100 steel.

Copyright © 2012 by ASME
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Fig. 1

Illustration of laser shock peening

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Fig. 2

The simulated model with path across the surface of the impacted material after the coating has been removed

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Fig. 3

Comparison with experimental results for 12Cr steel [12]

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Fig. 4

Comparison with experimental results for Ti64 [13]

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Fig. 5

Illustration of the overlaps

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Fig. 6

Illustration of the surface area affected by four impacts

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Fig. 7

Effect of overlaps in annealed 1053 steel

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Fig. 8

Effect of overlap in hardened AISI 52100 steel

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Fig. 9

Residual stress distribution on the surface of annealed 1053 steel

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Fig. 10

Residual stress distribution on the surface of hardened 52100 steel




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