Coupling Between Mesoplasticity and Damage in High-cycle Fatigue

Laurent Flaceliere , Franck Morel , André Dragon

The multiaxial fatigue loading in the high-cycle regime leads to localized mesoscopic plastic strain that occurs in some preferential directions of individual grains for most metallic materials. Crack initiation modeling is difficult in this fatigue regime because the scale where the mechanisms operate is not the engineering scale (macroscopic scale), and local plasticity and damage act simultaneously. This article describes a damage model based on the interaction between mesoplasticity and local damage for the infinite and the finite fatigue life regimes. Several salient effects are accounted for via a simple localization rule, which connects the macroscopic scale with the mesoscopic one, and by the model presented here, which describes the coupled effects of mesoplasticity and damage growth.

Mots clés: multiaxial fatigue; damage model; mesoplasticity; experiment.; experiment

Laurent Flaceliere, Franck Morel, André Dragon. Coupling Between Mesoplasticity and Damage in High-cycle Fatigue. International Journal of Damage Mechanics, 2007, 16 (4), pp.473-509. ⟨10.1177/1056789506067935⟩. ⟨hal-00571160⟩