Plasticity-damage based micromechanical modelling in high cycle fatigue

Abstract : A micro-macro approach of multiaxial fatigue in unlimited endurance is proposed. It allows one to take into account plasticity and damage mechanisms which occur at the scale of Persistent Slip Bands (PSB). The proposed macroscopic fatigue criterion, which corresponds to microcracks nucleation at the PSB-matrix interface, is derived for different homogenization schemes (Sachs, Lin-Taylor and Kröner). The role of a mean stress and of the hydrostatic pressure in high cycle fatigue is shown; in particular, in the case of Lin-Taylor scheme and linear isotropic hardening rule at microscale, one recovers the linear dependance in pressure postulated by K. Dang Van for the macroscopic fatigue criterion. This dependence is related here to the damage micro-mechanism. Finally, the particular case of affine loading is presented as an illustration.
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Submitted on : Thursday, March 23, 2006 - 3:37:47 PM
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Vincent Monchiet, Eric Charkaluk, Djimedo Kondo. Plasticity-damage based micromechanical modelling in high cycle fatigue. Comptes Rendus Mécanique, Elsevier Masson, 2006, 334, pp.129-136. ⟨10.1016/j.crme.2005.12.002⟩. ⟨hal-00021651⟩



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