A new Approach in Residual Stresses Analysis by Speckle Interferometry

Afaf Maras (1) , Guillaume Montay (1) , Olivier Sicot (1) , Emmanuelle Rouhaud (1) , Manuel François (1)

1 LASMIS - Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée

The knowledge of residual stresses allows a reliable prediction of structure performances evolution, such as service life [1-3]. In this paper, we develop a new method for residual stresses determination combining Electronic Speckle Pattern Interferometry (ESPI) with the machining of a groove. The internal stress field is perturbed as the depth of the groove is increased incrementally. The structure finds a new equilibrium state generating displacements which are measured using ESPI. This method was tested on an aluminium alloy AU4G plate treated locally by an ultrasonic shot-peening. The investigation of the images obtained with the phase shifting technique and fringe patterns, makes it possible to analyze, simultaneously, the stress profile along two directions: along the depth of the structure, and along the groove direction.

Mots clés: Electronic Speckle Pattern Interferometry (ESPI); Groove Method; Phase Shifting; Residual Stress; Speckle Interferometry; Stress Gradient

Domaines: Mécanique des matériaux [physics.class-ph]

Afaf Maras, Guillaume Montay, Olivier Sicot, Emmanuelle Rouhaud, Manuel François. A new Approach in Residual Stresses Analysis by Speckle Interferometry. Materials Science Forum, 2006, 524-525, pp.465-470. ⟨10.4028/www.scientific.net/MSF.524-525.465⟩. ⟨hal-02275902⟩