FEM simulation of residual stresses induced by laser Peening

¹ Coopération Laser Franco-Allemande, Laboratoire pour l'Application des Lasers de Puissance (CLFA-LALP), UPR 1578 CNRS, 94114 Arcueil, France
² Laboratoire Mécanique et Microstructure des Matériaux (LM3), ESA CNRS 8006 – École Nationale Supérieure d'Arts et Métiers, 75013 Paris, France

Corresponding author: ppeyre@clfa.fr

Received: 18 September 2002
Accepted: 8 April 2003
Published online: 12 June 2003

Abstract

Benefits from laser Peening have been demonstrated several times in fields like fatigue, wear or stress corrosion cracking. However, in spite of recent work on the calculation of residual stresses, very few authors have considered a finite element method (FEM) approach to predict laser-induced mechanical effect. This comes mainly from the high strain rates involved during LP (10⁶ s^-1), that necessitate the precise determination of dynamic properties, and also from the possible combination of thermal and mechanical loadings in the case of LP without protective coatings. In this paper, we aim at presenting a global approach of the problem, starting from the determination of loading conditions and dynamic yield strengths, to finish with FEM calculation of residual stress fields induced on a 12% Cr martensitic stainless steel and a 7075 aluminium alloy.