As the laser spot size in microscale laser shock peening is in the order of magnitude of several microns, the anisotropic response of grains will have a dominant influence on its mechanical behavior of the target material. Furthermore, conventional plasticity theory employed in previous studies needs to be re-examined due to the length scale effect. In the present work, the length scale effects in microscale laser shock peening have been investigated. The crystal lattice rotation underneath the shocked surface was determined via electron backscatter diffraction. From these measurements, the geometrically necessary dislocation (GND) density that the material contains has been estimated. The yield strength increment was then calculated from the GND distribution by using the Taylor model and integrated into each material point of the finite element method (FEM) simulation. Finite element simulations, based on single crystal plasticity, were performed for the process both with and without considering the GND hardening, and the comparison has been conducted.
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August 2009
Research Papers
Spatially Resolved Characterization of Geometrically Necessary Dislocation Dependent Deformation in Microscale Laser Shock Peening
Youneng Wang,
Youneng Wang
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
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Jeffrey W. Kysar,
Jeffrey W. Kysar
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
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Youneng Wang
Department of Mechanical Engineering,
Columbia University
, New York, NY 10027
Jeffrey W. Kysar
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. Aug 2009, 131(4): 041014 (9 pages)
Published Online: July 15, 2009
Article history
Received:
July 8, 2008
Revised:
April 17, 2009
Published:
July 15, 2009
Citation
Wang, Y., Kysar, J. W., Vukelic, S., and Yao, Y. L. (July 15, 2009). "Spatially Resolved Characterization of Geometrically Necessary Dislocation Dependent Deformation in Microscale Laser Shock Peening." ASME. J. Manuf. Sci. Eng. August 2009; 131(4): 041014. https://doi.org/10.1115/1.3160370
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