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.
Numerical Study of Laser Shock Peening Effects on Alloy 600 Nozzles With Initial Residual Stresses
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.
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Kim, J., Nam, H., Kim, Y., and Kim, J. (April 24, 2017). "Numerical Study of Laser Shock Peening Effects on Alloy 600 Nozzles With Initial Residual Stresses." ASME. J. Pressure Vessel Technol. August 2017; 139(4): 041406. https://doi.org/10.1115/1.4035977
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