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TECHNICAL PAPERS

Measurement of Thickness-Average Residual Stress Near the Edge of a Thin Laser Peened Strip

[+] Author and Article Information
Jon E. Rankin, Michael R. Hill

Mechanical and Aeronautical Engineering Department, University of California, Davis, CA

J. Eng. Mater. Technol 125(3), 283-293 (Jul 10, 2003) (11 pages) doi:10.1115/1.1584481 History: Received April 15, 2002; Revised February 11, 2003; Online July 10, 2003
Copyright © 2003 by ASME
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References

Figures

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(a) Geometry of usual through-thickness slitting and (b) geometry of near-edge, thin-material slitting
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Dimensions of the titanium strip with the peened area (hatched) and sites where slitting was performed
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Schematic installation of a zero-width strain gage, showing slit depth a, slit width w, strain gage length Lg, gage offset from the slit edge s, and gage location along the slit d
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Zoomed view of the cut location in the finite element mesh; removed elements simulate a 1.27 mm deep slit
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κ versus gage location for single-gage installations and all expansion orders (the 0th order expansion has condition number of 1.0 at all orders)
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Average normalized condition number Φ(d) versus gage location (single-gage installation) showing an optimal location d=0.701 amax
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κ versus expansion order for optimal one, two, and three-gage installations
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Optimal gage locations for one, two, and three-gage installations
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Comparison of κ versus the number of terms in the stress expansion for optimal two-gage installations employing three different expansion bases
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Strain measured at optimal gage locations due to slitting the laser peened strip at two measurement sites: (a) Site 5 and (b) Site 6
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Near-edge residual stress at two sites on the laser peened strip
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κ at each order of stress expansion for the optimal two-gage installation (determined by minimizing Φ) compared with the minimum value of κ at each order
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κ versus order for the optimal two-gage installation compared with two ad hoc installations. Inset shows gage locations for the ad hoc installations.
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κ versus expansion order for optimal two-gage installations where the gage-center to slit-edge distance was s=1.36 or 2.53 mm. Inset text lists the optimal gage locations along the slit.

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