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Optical Hole-Drilling Residual Stress Calculations Using Strain Gauge Formalism

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Abstract

Background

Optical measurement techniques such as digital image correlation and speckle interferometry have been applied to hole-drilling evaluations of residual stress for some decades. These full-field non-contact measurements can have significant advantages over the traditional strain gauge method. However, optical measurements are still only rarely used for practical measurements outside the research environment. A significant barrier to such use is the mathematical challenge of analyzing the large quantity of optical data to evaluate the residual stresses.

Objective

The objective here is to provide a residual stress computation scheme that can be implemented straightforwardly and efficiently, also to provide the needed calibration data.

Method

The approach taken is to recast the optical data into a compact arrangement that parallels the established format used for strain gauge style calculations.

Results

Several computation variants are explored, some show high stress sensitivity, while others give resistance to common measurement artifacts. Surface displacement data taken from near the hole edge give the highest stress sensitivity, while more distant data give greater ability to identify interior stresses.

Conclusions

The proposed residual stress computation method is shown to be an effective and practical way to compute residual stresses from optical hole-drilling measurements.

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Acknowledgements

This work was financially supported through a grant from the Natural Sciences and Engineering Research Council of Canada (NSERC). Dr. Juuso Heikkinen kindly reviewed the manuscript and made several helpful comments and suggestions.

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  1. Department Mechanical Engineering, University of British Columbia, Vancouver, Canada

    G. S. Schajer

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  1. G. S. Schajer
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Correspondence to G. S. Schajer.

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Appendix

Appendix

Table 1 Setup data for various measurement formats. Dimension quantities are normalized by hole radius. * = estimated value
Full size table
Table 2 Calibration coefficients for the measurement formats listed in Table 1. (Valid up to the lesser of HLIM and 2.5)
Full size table

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Schajer, G.S. Optical Hole-Drilling Residual Stress Calculations Using Strain Gauge Formalism. Exp Mech 61, 1369–1380 (2021). https://doi.org/10.1007/s11340-021-00740-7

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