Mesure des contraintes résiduelles pa la technique de l'interférométrie de moiré de trés grande sensibilité et la méthode du perçage incréental

The theoretical development of a combined method of moiré interferometry, Twyman-Green interferometry and incremental hole-drilling method is presented. The relationship between the three-dimensional surface displacements produced by introducing a blind hole and the corresponding residual stress is established by employing the existing theoretical solution containing a set of undetermined coefficients. The in-plane surface displacements U_x and U_y and out of plane surface displacement U_z produced by the relaxation of residual stresses are obtained from moiré interferometry and Twyman-Green interferometry respectively. The accuracy of the method and the experimental procedure to determine the signs of residual stresses are described. A typical example is presented. © 2001 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS.