Measurement of the Axial Residual Stresses Using the Initial Strain Approach

[+] Author and Article Information
Weili Cheng

Berkeley Engineering and Research, Inc., 896 Seville Place, Fremont, CA 94539 e-mail: weilicheng@home.com

J. Eng. Mater. Technol 122(1), 135-140 (Jul 16, 1999) (6 pages) doi:10.1115/1.482777 History: Received April 24, 1998; Revised July 16, 1999
Copyright © 2000 by ASME
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Illustrations of (A) a beam and a rod and (B) a long butt weld between two plates with residual axial stresses distributed uniformly along the length except near the ends
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Linear superposition used for crack compliance method based on an approximation of the stress
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A beam subjected to four-points bending to produce a uniform axial stress distribution in the midsection between the two inner support pins
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Schematics of (A) crack compliance method for a beam subjected to initial strains with and without a cut of increasing depth; (B) after undergoing cutting or material removal the same beam is used to measure the initial strains by introducing a cut of increasing depth
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Schematics of (A) a long cylinder with an axisymmetric residual stress is separated at the midsection z=0; (B) a slice cut out along plane z=0 while hoop and/or radial strains are recorded on plane z=0; (C) linear superposition for the initial strain approach
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Two different residual stresses (data lines) produced by four-points bending used for validation of the crack compliance method. Dotted line—estimated using the compliance functions computed by FEM.
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Configuration of the test for measurement of the initial strains in a section of the beam using the crack compliance method
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Residual stress distributions measured on the plane of cut (dashed line) and in the original beam (solid line) compared with that predicted from the bending test
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Results of convergence study using Legendre polynomials series of orders 15–19 to approximate the initial strain field in a beam due to bending beyond elastic limit




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