Abstract
The conventional way to present Integral Method calibration data for hole-drilling residual stress measurements is in the form of a large triangular table of numbers. In the common case where 20 drilling steps are used for the hole-drilling measurement, 231 numerical coefficients are needed. While such tables are effective, their bulk inhibits their use for other than the most common experimental arrangements; the convenience and usefulness of the hole-drilling method would be much extended if the bulk of the calibration data could be reduced. Here, a two-variable polynomial formulation is proposed to represent the hole-drilling calibration data. It comprises 15 numerical coefficients and provides calibration data with average accuracy within 1%, with occasional outliers reaching around 2%. The compactness of the calibration stimulated exploration of hole-drilling response beyond the conventional “thick” specimen case, also to include finite thickness specimens down to very thin (through-hole) geometries. Tables of calibration data are provided here for ASTM E837 Type A, B and C strain gauge rosettes, for various hole diameters, for conventional “thick” specimens, and for finite thickness specimens down to the through-hole case.
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Acknowledgements
This work was financially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). Dr. Philip Whitehead kindly gave many important comments and insights. Prof. R. L. Taylor generously provided the FEAP software used for the finite element analyses reported here, and kindly added the axi-harmonic element needed for the shear stress calculations.
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Schajer, G.S. Compact Calibration Data for Hole-Drilling Residual Stress Measurements in Finite-Thickness Specimens. Exp Mech 60, 665–678 (2020). https://doi.org/10.1007/s11340-020-00587-4
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DOI: https://doi.org/10.1007/s11340-020-00587-4