Reference : Finite element investigation of size effects on the mechanical behavior of nickel sin...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Finite element investigation of size effects on the mechanical behavior of nickel single crystals
Keller, Clément [INSA ROUEN > > > >]
Habraken, Anne mailto [Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo >]
Duchene, Laurent mailto [Université de Liège - ULiège > Département Argenco : Secteur MS2F > Analyse multi-échelles des matériaux et struct. du gén. civ. >]
Materials Science & Engineering : A
Elsevier Science
Yes (verified by ORBi)
[en] Finite element method ; Crystal plasticity ; Size effects ; Single crystal ; Boundary conditions ; LIMARC
[en] The influence of dimensions on the mechanical behavior of f.c.c. single crystals with dimensions larger than a few micrometers has been the topic of many experimental investigations and controversies during the 1970s and this question is still open. The objective of this article is to shed new light on this point by performing finite element simulations thanks to a strain gradient crystal plasticity model. Based on the model identification for nickel, several single crystal samples with various thicknesses and orientations were tested numerically in tension. The effect of dimensions was then analyzed considering the spatial distribution of dislocation densities. Near loading boundaries, dislocation density gradients appeared perpendicular to the Burgers vector direction of the primary activated slip system which modified the mechanical behavior. These gradients are discussed in terms of boundary conditions, crystal orientation and dislocation interactions with surfaces.
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