A continuum damage mechanics-based approach for the high cycle fatigue behavior of metallic polycrystals
TypeArticles dans des revues avec comité de lecture
Polycrystalline elasto-plasticity models provide a general framework for investigating the effect of microstructural heterogeneities (e.g. grains, inclusions, pores) on the high cycle fatigue behavior of metallic materials. In this work, continuum damage mechanics is used to construct a set of constitutive relations to describe the progressive degradation of certain mechanical properties at the grain scale. The damage is considered to be coupled with the elastic behavior of the material. Special care is taken to include the anisotropic aspect of fatigue damage and the effect of intragranular internal stresses. The constitutive relations are then implemented within a self-consistent model to evaluate intergranular interactions. Finally, the model is used to investigate the high cycle fatigue behavior of polycrystalline copper. It is shown that the influence of certain loading conditions on the high cycle behavior is correctly reproduced. Specifically, the application of a mean shear stress does not result in an increase in damage; however, a mean normal stress is damaging. That is, a decrease in the fatigue resistance is predicted when the mean normal stress is increased.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
Experimental and numerical study of the evolution of stored and dissipated energies in a medium carbon steel under cyclic loading MAREAU, Charles; CUILLERIER, Daniel; MOREL, Franck (Elsevier, 2013)To obtain robust estimations of the fatigue limit from energy-based fatigue criteria, constitutive laws must include a correct description of the energy balance when modeling the cyclic behavior. The present paper aims at ...
MAREAU, Charles; MOREL, Franck (2013)In the case of cyclic plasticity, the validity of a constitutive model is usually assessed using stress-strain curves. However, this description can be enriched by adopting an energetic point of view. Thus, in the present ...
Development of a polycrystalline approach for the modelling of high cycle fatigue damage: Application to a HSLA steel ZGHAL, Jihed; MAREAU, Charles; MOREL, Franck (Technische Mechanik, 2015)For many metallic alloys, fatigue crack initiation is governed by the development of a localized plastic activity at the grain scale. Because of the irreversible nature of plasticity, a significant proportion of the total ...
A crystal plasticity based approach for the modelling of high cycle fatigue damage in metallic materials ZGHAL, Jihed; GMATI, Hela; MAREAU, Charles; MOREL, Franck (Sage Pub, 2016)In this paper, a polycrystalline model is proposed to describe the fatigue behaviour of metallic materials in the high cycle fatigue regime. The model is based on a multiscale approach, which allows the connection of local ...
Experimental and numerical study of the evolution of stored energy in metallic materials under cyclic loading MAREAU, Charles; MOREL, Franck (2014)In-service loading conditions usually generate complex cyclic stress states. As such, the choice of an appropriate multiaxial fatigue criterion plays a crucial role in obtaining correct fatigue predictions. In the case of ...