Article (Scientific journals)
Finite element analysis of the free surface effects on the mechanical behavior of thin nickel polycrystals
Keller, Clément; Hug, eric; Habraken, Anne et al.
2012In International Journal of Plasticity, 29, p. 155–172
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Keywords :
Strengthening and mechanisms; finite elements; nickel; size e ffects; LIMARC
Abstract :
[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.
Disciplines :
Materials science & engineering
Author, co-author :
Keller, Clément ;  Université de Liège - ULiège > Département Argenco : Secteur MS2F > Département Argenco : Secteur MS2F
Hug, eric
Habraken, Anne  ;  Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Duchene, Laurent  ;  Université de Liège - ULiège > Département Argenco : Secteur MS2F > Département Argenco : Secteur MS2F
Language :
English
Title :
Finite element analysis of the free surface effects on the mechanical behavior of thin nickel polycrystals
Publication date :
2012
Journal title :
International Journal of Plasticity
ISSN :
0749-6419
Publisher :
Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom
Volume :
29
Pages :
155–172
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 July 2011

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