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TECHNICAL PAPERS

Residual Stress Measurement in Spot Welds and the Effect of Fatigue Loading on Redistribution of Stresses Using High Sensitivity Moiré Interferometry

[+] Author and Article Information
Sanjeev K. Khanna

Dept. of Mechanical Engineering, South Dakota School of Mines & Technology, Rapid City, SD 57701-3995

Canlong He

Dept. of Mechanical Engineering, University of Missouri—Rolla, Rolla, MO 65409

Hari N. Agrawal

Durability, CAE Development, Ford Motor Co., Dearborn, MI 48124

J. Eng. Mater. Technol 123(1), 132-138 (Jan 21, 2000) (7 pages) doi:10.1115/1.1286218 History: Received February 22, 1999; Revised January 21, 2000
Copyright © 2001 by ASME
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References

Figures

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Diffraction by the specimen grating of the incident laser beams producing plane wavefronts A′ and B′ for the initial no load condition of the specimen. Warped wavefronts result from nonhomogeneous deformation of the specimen.
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Schematic optical layout of the 3-mirror 4-beam moiré interferometer
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Spot welded specimens: (a) Single face tensile shear specimen, (b) two spot tensile shear specimen, (c) double face tensile shear specimen, (d) through tension specimen, (e) cross tension specimen in cross shape, (f) peel specimen as double angle specimen, (g) peel tension specimen as angle to plate variant
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Typical moiré fringe patterns obtained around a small blind hole drilled in a spot weld
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Typical moiré fringe patterns with carrier fringes around a small blind hole drilled in a spot weld
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Effect of the hole drilling machining process on the residual stress field
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Variation of the in-plane principal residual stresses in a single face tensile shear spot weld
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Variation of the in-plane principal residual stresses in a double face tensile shear spot weld

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