000015479 001__ 15479
000015479 005__ 20161115100223.0
000015479 04107 $$aeng
000015479 046__ $$k2016-08-21
000015479 100__ $$aKnezevic, Marko
000015479 24500 $$aTransitioning rate sensitivities across multiple length scales in crystal plasticity

000015479 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000015479 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000015479 506__ $$arestricted
000015479 520__ $$2eng$$aA finite-element based plasticity model is developed for polycrytals deforming at high-strain—rates. The model is multi-scale, covering from thermally activated dislocation motion on a specific crystallographic slip system, to single crystal plasticity, to polycrystalline plasticity, and ultimately heterogeneous deformation of the macro-scale sample. Within the model, the rate dependence in macro-scale response arises solely from the characteristic stress to activate dislocation motion. This is accomplished by introduction of a novel methodology, used at the intermediate length scales, to remove any extraneous rate dependencies occurring as a result of the visco-plastic rate sensitive flow rule, commonly associated with crystal plasticity formulations. Simulation results are presented for the deformation of high-purity zirconium in a Taylor impact cylinder test. The variation in sample shape changes, texture evolution, and deformation twin fraction after the test are experimentally measured. These same quantities are calculated using the model and good agreement is achieved in all aspects.

000015479 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015479 653__ $$a

000015479 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000015479 720__ $$aKnezevic, Marko
000015479 8560_ $$ffischerc@itam.cas.cz
000015479 8564_ $$s152792$$uhttps://invenio.itam.cas.cz/record/15479/files/TS.SM15-3.02.pdf$$yOriginal version of the author's contribution as presented on CD,  page 2879, code TS.SM15-3.02
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000015479 962__ $$r13812
000015479 980__ $$aPAPER