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A deformation mechanism map for polycrystals modeled using strain gradient plasticity and interfaces that slide and separate
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0002-9509-2811
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2013 (English)In: International journal of plasticity, ISSN 0749-6419, Vol. 43, 177-195 p.Article in journal (Refereed) Published
Abstract [en]

Small scale strain gradient plasticity is coupled with a model of grain boundaries that take into account the energetic state of a plastically strained boundary and the slip and separation between neighboring grains. A microstructure of hexagonal grains is investigated using a plane strain finite element model. The results show that three different microstructural deformation mechanisms can be identified. The standard plasticity case in which the material behaves as expected from coarse grained experiments, the nonlocal plasticity region where size of the microstructure compared to some intrinsic length scale enhances the yield stress and a third mechanism, active only in very fine grained microstructures, where the grains deform mainly in relative sliding and separation.

Place, publisher, year, edition, pages
2013. Vol. 43, 177-195 p.
Keyword [en]
Strain gradient plasticity, Size-effects, Deformation mechanisms, Grain boundary sliding
National Category
Applied Mechanics Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-120156DOI: 10.1016/j.ijplas.2012.11.010ISI: 000315701900010ScopusID: 2-s2.0-84874106873OAI: diva2:613979
Swedish Research Council, 621-2005-5759

QC 20130403

Available from: 2013-04-03 Created: 2013-04-02 Last updated: 2013-12-05Bibliographically approved

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Dahlberg, Carl F. O.Faleskog, Jonas
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