Numerical approach of cyclic behavior of 316LN stainless steel based on a polycrystal modeling including strain gradients.

Julien Schwartz (1) , Olivier Fandeur (2) , Colette Rey (1)

1 MSSMat - Laboratoire de mécanique des sols, structures et matériaux
2 LM2S - Laboratoire de Mécanique Systèmes et Simulation

A non-local polycrystal approach, taking into account strain gradients, is proposed to simulate the 316LN stainless steel fatigue life curve in the hardening stage. Material parameters identification is performed on tensile curves corresponding to several 316LN polycrystals presenting different grain sizes. Applied to an actual 3D aggregate of 316LN stainless steel of 1,200 grains, this model leads to an accurate prediction of cyclic curves. Geometrical Necessary Dislocation densities related to the computed strain gradient are added to the micro-plasticity laws. Compared to standard models, this model predicts a decrease of the local stresses as well as a grain size effect.

Keywords: low cycle fatigue; non-local polycrystalline model; grain size; austenitic stainless steel.; austenitic stainless steel

Domains: Computer Science [cs]; Modeling and Simulation; Engineering Sciences [physics]

Julien Schwartz, Olivier Fandeur, Colette Rey. Numerical approach of cyclic behavior of 316LN stainless steel based on a polycrystal modeling including strain gradients.. International Journal of Fatigue, 2013, 55, pp.202-212. ⟨10.1016/i.jfatigue.2013.07.003⟩. ⟨hal-00841744⟩