FIRST STEPS OF CRACK INITIATION AND PROPAGATION IN FATIGUE OF FCC CRYSTALS STUDIED BY DISLOCATION DYNAMICS - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

FIRST STEPS OF CRACK INITIATION AND PROPAGATION IN FATIGUE OF FCC CRYSTALS STUDIED BY DISLOCATION DYNAMICS

C. Déprés
  • Fonction : Auteur
G.V. Prasad Reddy
  • Fonction : Auteur
L. Tabourot
R. Sandhya
  • Fonction : Auteur
S. Sankaran
  • Fonction : Auteur

Résumé

3D discrete dislocation dynamic (DDD) simulations are performed to simulate stage-I fatigue crack initiation and propagation along the surface, in the primary grain and its neighbouring grain, in 316L stainless steel. The scenario of crack propagation in primary grain and the evolution of dislocation structure ahead of crack tip are discussed, and in addition crack tip sliding displacement is estimated. Probable mechanisms of crack propagation from primary grain to neighbouring grain are evaluated. In this process, surface relief in the neighbouring-grain under the influence of crack stress field in the primary grain is studied for varying neighbouringgrain orientations. An enhanced evolution of surface extrusions in the neighbouring grain, are observed in the presence of heterogeneous stress field (i.e., in the presence of crack in the primary grain), compared to that in the case of homogeneous stress field. In addition, influence of crack stress field on prior cyclic-deformed substructure is presented.
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  • HAL Id : hal-00994424 , version 1

Citer

Christophe Depres, C. Déprés, G.V. Prasad Reddy, L. Tabourot, R. Sandhya, et al.. FIRST STEPS OF CRACK INITIATION AND PROPAGATION IN FATIGUE OF FCC CRYSTALS STUDIED BY DISLOCATION DYNAMICS. 11th Biennial Conference On Engineering Systems Design And Analysis, Jul 2012, Nantes, France. pp.297-307. ⟨hal-00994424⟩
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