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, *
* Corresponding author
2 LM2S - Laboratoire de Mécanique Systèmes et Simulation
DM2S - Département de Modélisation des Systèmes et Structures : DEN/DM2S/SEMT
Abstract : 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.
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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, Elsevier, 2013, 55, pp.202-212. ⟨10.1016/i.jfatigue.2013.07.003⟩. ⟨hal-00841744⟩

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