Simulation Of Stage I Fatigue Crack Growth In A Polycrystal Through
Coupled FEM And Discrete Dislocation Dynamics
Author(s)
G. Bertolino, V. Doquet & M Sauzay
Abstract
Simulation of stage I fatigue crack growth
in a polycrystal through coupled FEM and
discrete dislocation dynamics
G. ~ertolino',~, V. ~ o ~ u e t ' & M. sauzay2
I L. M. S., CNRS, Ecole Polytechnique, France
'CEA, DEN-DMN-SRMA, France
Abstract
An attempt to model the variability of short crack development in high-cycle
fatigue is made by coupling finite element computations of the stresses ahead of a
microcrack in a polycrystal with simulations of crack growth along slip planes
based on discrete dislocations dynamics. The model predicts a large scatter in
growth rates related to the crystallographic disorientations along the crack path. It
also describes qualitatively the influence of the mean grain size and the fact that
overloads may suppress the endurance limit by allowing arrested cracks to cross
the grain boundaries.
1 Introduction
High-cycle fatigue is characterised by a large scatter in fatigue lives which
reflects the scatter in mechanical conditions encountered by short cracks in the
Keywords
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