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Research Papers

Dynamic Material Response of Aluminum Single Crystal Under Microscale Laser Shock Peening

[+] Author and Article Information
Sinisa Vukelic, Youneng Wang, Jeffrey W. Kysar, Y. Lawrence Yao

Department of Mechanical Engineering, Columbia University, New York, NY 10027

J. Manuf. Sci. Eng 131(3), 031015 (May 29, 2009) (10 pages) doi:10.1115/1.3106034 History: Received July 22, 2008; Revised January 19, 2009; Published May 29, 2009

The process of laser shock peening induces compressive residual stresses in a material to improve material fatigue life. For micron sized laser beams, the size of the laser-target interaction zone is of the same order of magnitude as the target material grains, and thus the target material must be considered as being anisotropic and inhomogeneous. Single crystals are chosen to study the effects of the anisotropic mechanical properties. It is also of interest to investigate the response of symmetric and asymmetric slip systems with respect to the shocked surface. In the present study, numerical and experimental aspects of laser shock peening on two different crystal surfaces (110) and (11¯4) of aluminum single crystals are studied. Lattice rotations on the top surface and cross section are measured using electron backscatter diffraction, while residual stress is characterized using X-ray microdiffraction. A numerical model has been developed that takes into account anisotropy as well as inertial terms to predict the size and nature of the deformation and residual stresses. Obtained results were compared with the experimental finding for validation purpose.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental setup

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Figure 2

Plane strain slip systems corresponding to (a) (110) orientation and (b) (11¯4) orientation; effective in-plane slip systems are labeled as i, ii, and iii

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Figure 3

Yield locus for (a) (110) orientation and (b) (11¯4) orientation

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Figure 4

Temporal pressure distribution during the loading in the numerical simulation

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Figure 5

Deformation field measured via profilometer and AFM, respectively: (a) orientation (110), and (b) orientation (11¯4)

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Figure 6

Lattice rotation contour map on a sample surface; (a) (110) rotation, and (b) (11¯4) rotation

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Figure 7

Lattice rotation contour map on the (110) cross section; positive rotation is counterclockwise about the z-axis

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Figure 8

Lattice deformation contour map by FEM: (a) (110) orientation, and (b) (11¯4) orientation

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Figure 9

FEM simulation of residual stress distribution in the (110) case

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Figure 10

Residual stress measured via X-ray microdiffraction

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Figure 11

(a) Shear strain increment in each slip system in the end of the loading step for (110) orientation: (1) increment in slip system i; (2) increment in slip system iii; (3) increment in slip system ii; and (4) total shear strain increment. (b) Shear strain increment in each slip system in the end of the loading step for (11¯4) orientation: (1) increment in slip system i; (2) increment in slip system iii; (3) increment in slip system ii; (4) total shear strain increment

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