Laser shock peening (LSP) is an innovative process which imparts compressive residual stresses in the processed surface of metallic parts to significantly improve fatigue life and fatigue strength of this part. In opposing dual sided LSP, the workpiece can be simultaneously irradiated or irradiated with different time lags to create different surface residual stress patterns by virtue of the interaction between the opposing shock waves. In this work, a finite element model, in which the hydrodynamic behavior of the material and the deviatoric behavior including work hardening and strain rate effects were considered, was applied to predict residual stress distributions in the processed surface induced under various conditions of the opposing dual sided microscale laser shock peening. Thus the shock waves from each surface will interact in different ways through the thickness resulting in more complex residual stress profiles. Additionally, when treating a thin section, opposing dual sided peening is expected to avoid harmful effects such as spalling and fracture because the pressures on the opposite surfaces of the target balance one another and prohibit excessive deformation of the target. In order to better understand the wave–wave interactions under different conditions, the residual stress profiles corresponding to various workpiece thicknesses and various irradiation times were evaluated.
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April 2007
Technical Papers
Numerical Investigation of Opposing Dual Sided Microscale Laser Shock Peening
Yajun Fan,
Yajun Fan
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
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Youneng Wang,
Youneng Wang
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
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Sinisa Vukelic,
Sinisa Vukelic
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
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Y. Lawrence Yao
Y. Lawrence Yao
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
Search for other works by this author on:
Yajun Fan
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
Youneng Wang
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
Sinisa Vukelic
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
Y. Lawrence Yao
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027J. Manuf. Sci. Eng. Apr 2007, 129(2): 256-264 (9 pages)
Published Online: August 30, 2006
Article history
Received:
February 6, 2006
Revised:
August 30, 2006
Citation
Fan, Y., Wang, Y., Vukelic, S., and Yao, Y. L. (August 30, 2006). "Numerical Investigation of Opposing Dual Sided Microscale Laser Shock Peening." ASME. J. Manuf. Sci. Eng. April 2007; 129(2): 256–264. https://doi.org/10.1115/1.2540771
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