Reference : Finite element analysis of the free surface effects on the mechanical behavior of thi...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/95595
Finite element analysis of the free surface effects on the mechanical behavior of thin nickel polycrystals
English
Keller, Clément mailto [Université de Liège - ULg > Département Argenco : Secteur MS2F > Département Argenco : Secteur MS2F >]
Hug, eric mailto [> >]
Habraken, Anne mailto [Université de Liège - ULg > Département ArGEnCo > Département ArGEnCo >]
Duchene, Laurent mailto [Université de Liège - ULg > Département Argenco : Secteur MS2F > Département Argenco : Secteur MS2F >]
2012
International Journal of Plasticity
Pergamon Press - An Imprint of Elsevier Science
29
155–172
Yes (verified by ORBi)
International
0749-6419
Oxford
United Kingdom
[en] Strengthening and mechanisms ; Strengthening and mechanisms ; finite elements ; nickel ; size e ffects ; size e ffects ; LIMARC
[en] The miniaturization of metallic samples has been proved to deeply affect their mechanical properties leading to a softening or a hardening effect depending on the order of the dimension reduction. The objective of this work is to provide new numerical results which explain the softening mechanisms on the mechanical behavior for nickel polycrystals which have been experimentally characterized by the authors in a previous published paper (Keller et al., 2011). Based on a strain gradient crystalline plasticity model identified for nickel, simulations of tensile tests were performed for samples with different thicknesses and grain sizes. The simulations correctly reproduce the softening effect linked to a decrease in the thickness and in the number of grains across the thickness. The analysis of the plasticity mechanisms shows that the softening is due to surface effects which are discussed in terms of grain orientations, dislocation mean free path and long-range back-stress. The model also predicts a hardening mechanism for further dimension reduction if the samples have only grain boundaries perpendicular to the tensile direction. In this case, the modification of the mechanical behavior is due to strain gradients formation.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/95595

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