Notes on a demonstration given by Welwyn Strain measurement ltd on residual stress measurement by the hole drilling method (November 1974) (IM-TS-053)

The general method is to measure the relaxed strains due to a hole being drilled in the residually stressed specimen. On the basis of linear elastic, theory it is possible to predict the strains that would be relaxed if the stress configuration were known. Conversely, by measuring the relaxed strains...