|type de publication
||article dans une revue internationale avec comité de lecture
|date de publication
||Monchiet Vincent; Charkaluk Eric; Kondo Djimédo|
||Mechanics Research Communication (Mech Res Comm)
| || |
||383 – 391
||A micro-macro approach of multiaxial fatigue in unlimited endurance is presented in
this study, as an extension of a previous model recently proposed by the authors .
It allows to take into account coupling between polycrystalline plasticity and damage
mechanisms which occur at the scale of persistent slip bands (PSB) during cyclic
deformation. The plasticity-damage coupled model is obtained by adapting the Gurson
 limit analysis to polycrystalline materials to take into account microvoids
growth along PSBs. The macroscopic fatigue criterion corresponds to microcracks
nucleation at the PSB-matrix interface. It is shown that this criterion accounts for
the effect of the mean stress and of the hydrostatic pressure in high cycle fatigue.
Such features of HCF are related to the damage micro-mechanisms. Finally, some
illustrations concerning the particular case of cyclic affine loadings are presented
and comparisons of the predictions of the fatigue criterion with experimental data
show the relevance of this new approach.
||Fatigue, Micromechanics, Unlimited endurance, PSB