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Research Papers: Materials and Fabrication

Numerical Study of Laser Shock Peening Effects on Alloy 600 Nozzles With Initial Residual Stresses

[+] Author and Article Information
Ji-Soo Kim

Department of Mechanical Engineering,
Korea University,
Sungbuk-Ku,
Seoul 136-701, South Korea
e-mail: rlawltn99@korea.ac.kr

Hyun-Suk Nam

Department of Mechanical Engineering,
Korea University,
Sungbuk-Ku,
Seoul 136-701, South Korea
e-mail: gustjr00@korea.ac.kr

Yun-Jae Kim

Department of Mechanical Engineering,
Korea University,
Sungbuk-Ku,
Seoul 136-701, South Korea
e-mail: kimy0308@korea.ac.kr

Ju-Hee Kim

Department of Mechanical Engineering,
Korea Military Academy,
P.O. Box 77-1,
Seoul 136-701, South Korea
e-mail: kjh6452@gmail.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 14, 2015; final manuscript received January 15, 2017; published online April 24, 2017. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 139(4), 041406 (Apr 24, 2017) (8 pages) Paper No: PVT-15-1270; doi: 10.1115/1.4035977 History: Received December 14, 2015; Revised January 15, 2017

This paper investigates the effect of initial residual stress and prestrain on residual stresses due to laser shock peening for Alloy 600 using numerical simulation. For simulation, the strain rate dependent Johnson–Cook hardening model with a Mie–Grüneisen equation of state is used. Simulation results are compared with published experimental data, showing good agreement. It is found that the laser shock peening (LSP) process is more effective for higher initial tensile residual stress and for larger initial prestrain in terms of compressive stress at the near surface. However, the effective depth decreases with increasing initial tensile residual stress and initial prestrain.

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References

Figures

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Fig. 1

Flowchart of general LSP simulation procedure

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Fig. 2

Normalized pressure as a function of (a) radial distance from the center of laser spot and (b) time induced by 8 ns laser pulse

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Fig. 3

Strain rate dependent stress–strain curves for Alloy 600

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Fig. 4

Schematic of experimental setup: under-water laser peening on Alloy 600 specimens performed at Toshiba [2]

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Fig. 5

Alloy 600 specimens and peening paths in LSP experiments [7,8]

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Fig. 6

Local FE model for the peened surface of Alloy 600 specimens and multiple peening process in the present LSP simulation

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Fig. 7

Determination of material model for Alloy 600 using experimental data for Alloy 600 small tube: (a) determination of hardening model and (b) determination of Co

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Fig. 8

Comparison of experimental and simulated in-depth residual stress profiles on Alloy 600 flat plate specimen with pulse energy of 60 mJ in the (a) x-direction and (b) y-direction

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Fig. 9

Comparison of experimental and simulated in-depth residual stress profiles on Alloy 600 flat plate specimen with pulse energy of 70 mJ in the (a) x-direction and (b) y-direction

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Fig. 10

Local FE model and analysis condition for the parametric study

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Fig. 11

Typical in-depth residual stress profiles: (a) under no initial stress and prestrain condition and (b) under the 10% prestrain and initial stress of 500 MPa in the x-direction

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Fig. 12

Mitigation of initial stress at surface with increasing number of laser shots in uniaxial initial stress condition ((a) and (b)) and biaxial initial stress condition ((c) and (d))

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Fig. 13

Effective depth with increasing number of laser shots in uniaxial initial stress condition ((a) and (b)) and biaxial initial stress condition ((c) and (d))

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Fig. 14

Comparison between FE results and test results of LSP effect on surface stress with initial stress [2]

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