First Steps of Crack Initiation and Propagation in Fatigue of FCC Crystals Studied by Dislocation Dynamics
Christophe Déprés,G.V. Prasad Reddy,Laurent Tabourot,R. Sandhya,S. Sankaran +4 more
- pp 297-306
TLDR
In this article, 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.Abstract:
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 neighbouring-grain 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.Copyright © 2012 by ASMEread more
Citations
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Journal ArticleDOI
The role of extrusions and intrusions in fatigue crack initiation
TL;DR: In this paper, the profiles of persistent slip markings produced by uniaxial and baoxial cyclic straining in four different polycrystalline materials with f.c. structure were investigated using focused ion beam (FIB) cutting and TEM observation of oriented surface foils.
Journal ArticleDOI
Profiles of persistent slip markings and internal structure of underlying persistent slip bands
Journal ArticleDOI
TEM Study of Microstructure Changes, Formation and Distribution of Slip Bands in Austenitic Steels after Low-Cycle Fatigue (LCF) Deformation - II
TL;DR: In this article, the effect of microstructure of structural steels on the rate of local cyclic deformation, leading to nucleation and growth of slip bands of fatigue cracks, was studied.
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