000015284 001__ 15284
000015284 005__ 20161115100217.0
000015284 04107 $$aeng
000015284 046__ $$k2016-08-21
000015284 100__ $$aBrenner, Renald
000015284 24500 $$aApproximate plastic yield criterion and hardening of porous single crystals

000015284 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000015284 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000015284 506__ $$arestricted
000015284 520__ $$2eng$$aThis study is devoted to the description of the plastic behaviour of porous single crystals in the context of rate-independent dislocation mediated plasticity. Such heterogeneous materials belong to the class of two-phase nonlinear composites with anisotropic local constitutive law. By making use of a regularized form of the Schmid law, an approximate plastic yield criterion is proposed in the context of limit-analysis. It has been assessed by comparison with unit-cell computations results. The model is then extended to hardenable crystals by performing a limit-analysis on a plastically deformed crystalline hollow sphere. The plastic strain field, and thus the local resistance of the material (i.e plastic yield surface), is assumed fixed. Comparisons are shown for the overall behaviour and porosity evolution with finite element unit-cell computations, from the literature, for body-centred cubic single crystals.

000015284 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015284 653__ $$a

000015284 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000015284 720__ $$aBrenner, Renald
000015284 8560_ $$ffischerc@itam.cas.cz
000015284 8564_ $$s126376$$uhttps://invenio.itam.cas.cz/record/15284/files/TS.SM08-1.03.pdf$$yOriginal version of the author's contribution as presented on CD,  page 2292, code TS.SM08-1.03
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000015284 962__ $$r13812
000015284 980__ $$aPAPER