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A micromechanical explanation of the mean stress effect in high cycle fatigue

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2008
auteur(s) Monchiet Vincent; Charkaluk Eric; Kondo Djimédo
journal (abréviation) Mechanics Research Communication (Mech Res Comm)
volume (numéro) 36 (6)
  
pages 383 – 391
résumé 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 [1]. 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 [2] 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.
mots clés Fatigue, Micromechanics, Unlimited endurance, PSB
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