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Research Papers

Dual-Axis Hole-Drilling ESPI Residual Stress Measurements

[+] Author and Article Information
Gary S. Schajer

Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada

Michael Steinzig

 Los Alamos National Laboratory, Los Alamos, NM 87544-1663

J. Eng. Mater. Technol 132(1), 011007 (Nov 03, 2009) (5 pages) doi:10.1115/1.3184035 History: Received December 11, 2008; Revised March 19, 2009; Published November 03, 2009; Online November 03, 2009

A novel dual-axis ESPI hole-drilling residual stress measurement method is presented. The method enables the evaluation of all the in-plane normal stress components with similar response to measurement errors, significantly lower than with single-axis measurements. A numerical method is described that takes advantage of, and compactly handles, the additional optical data that are available from the second measurement axis. Experimental tests were conducted on a calibrated specimen to demonstrate the proposed method, and the results supported theoretical expectations.

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References

Figures

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Figure 1

Cross section view of the displacements around a drilled hole in a stressed material

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Figure 2

ESPI setup for surface displacement measurements. Adapted from Ref. 8.

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Figure 3

An ESPI fringe pattern created by hole drilling in a stressed material

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Figure 4

Computed ESPI fringe patterns for in-plane stresses: (a) τxy=100 MPa, (b) σx=100 MPa, and (c) σy=100 MPa

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Figure 5

Dual-axis ESPI system

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Figure 6

Dual-axis ESPI fringe pattern measurements: (a) Axis 1 and (b) Axis 2

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Figure 7

Measured and expected standard deviations of measurement sets: (a) measured values and (b) expected values

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