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Research Papers

An Analytical Model to Predict Residual Stress Field Induced by Laser Shock Peening

[+] Author and Article Information
Yongxiang Hu1

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, Chinahuyx@sjtu.edu.cn

Zhenqiang Yao

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China

Jun Hu

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

1

Corresponding author.

J. Manuf. Sci. Eng 131(3), 031017 (May 29, 2009) (7 pages) doi:10.1115/1.3139219 History: Received June 20, 2008; Revised April 16, 2009; Published May 29, 2009

Laser shock peening (LSP) is an innovative surface treatment technique similar to shot peening. An analytical model to predict the residual stress field can obtain the impact effect much quickly, and will be invaluable in enabling a close-loop process control in production, saving time and cost of processing. A complete analytical model of LSP with some reasonable simplification is proposed to predict residual stresses in depth by a sequential application of a confined plasma development model and a residual stress model. The spatial distribution of the shock pressure and the high strain rate effect are considered in the model. Good agreements have been shown with several experimental measured results for various laser conditions and target materials, thus proving the validity of the proposed model.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of laser shock peening

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Figure 2

Typical time history of shock pressure profile, α=0.10

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Figure 3

Geometry of the half-space elastic model (14)

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Figure 4

Axisymmetrical half-space elastic model with a concentrated normal load (14)

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Figure 5

Solution procedure of the analytical model

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Figure 6

The model predicted residual stress in the 2024-T3 alloy workpiece (laser intensity—6 GW/cm2, laser pulse duration—15 ns, spot radius—6 mm, quartz (1,19); α=0.10, η=1, Δt=0.05 ns, and M=400)

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Figure 7

The model predicted residual stresses in the Ti6Al4V workpiece for different laser intensities (laser pulse duration—20 ns, spot radius—2.8 mm, water (2); α=0.13, η=0.25, Δt=0.1 ns, and M=400)

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Figure 8

The model predicted residual stress in the 12Cr steel workpiece for different laser intensities (laser pulse duration—2.5 ns, spot radius—6 mm, water (8); α=0.10, η=1.5, Δt=0.025 ns, and M=400)

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