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Universal Calibration Constants for Strain Gauge Hole-Drilling Residual Stress Measurements

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Abstract

Background

There is a large geometrical variation among the commercially available strain gauge rosettes used for hole-drilling residual stress measurements. Detailed calibration data are readily available only for the rosette types described in ASTM Standard Test Procedure E837-20. This makes it difficult for the ordinary practitioner to use other rosette types for hole-drilling residual stress measurements.

Objective

The aim here is to develop a numerical adjustment scheme that can accommodate variations in strain gauge length and width, and enable the publicly available calibration data provided in E837-20 to be used with general rosette types.

Results

The proposed numerical adjustment scheme gives calibration results typically within ~ 2% of the values found from a custom computation based on the fine details of the strain gauge geometry. This effect may cause ~ 3% variations in the computed residual stresses.

Conclusions

The computed calibration data are suitable for practical hole-drilling measurements. The differences in the calibration data from the custom results are small compared with the range of the stress measurement errors typically encountered in practical hole-drilling.

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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 many helpful suggestions.

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  1. Department of 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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Schajer, G.S. Universal Calibration Constants for Strain Gauge Hole-Drilling Residual Stress Measurements. Exp Mech 62, 351–358 (2022). https://doi.org/10.1007/s11340-021-00771-0

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  • DOI: https://doi.org/10.1007/s11340-021-00771-0

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