Abstract: The present paper discusses the calibration coefficient experimentally determined and theoretically calculated in measuring residual stresses by hole-drilling method used to evaluate residual stresses in aluminium alloy. The results show that the solution of Schajer's finite-element method is suitable for thick parts and other expressions can be applied to thin parts, For those parts having intermediate thickness an experimental determinatiion of coefficients is necessary In addition, it seems that application of Schajer' s solution modified by our study tallies with experimental conditions.

Key words: aluminiun, alloy, residual sness, hole drilling method, calibreation coefficrent