Abstract
The hole drilling method is a well-established technique for measuring residual stresses in a wide range of materials. In this paper, in order to improve the measurement accuracies of hole drilling method, several numerical results are shown in two cases such that radial strains and tangential strains around the circular hole are detected, by consideration of strain variation in the finite region of each gage area. The results obtained are summarized as follows. (1) The measurement accuracies become higher by detection of tangential strains than radial one. (2) It is necessary to calculate the strain average in each gage area for residual stress measurement. (3) The analytical theory which considers the strain variation are proved to be valid by the experiment using steel specimens.
