On Strain Gradients in Plasticity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F01%3A01066149" target="_blank" >RIV/68407700:21340/01:01066149 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

On Strain Gradients in Plasticity

Popis výsledku v původním jazyce

The classical theory of plasticity predicts no size effects and fails to describe localization of plastic strain in a realistic way. A standard way of extending plasticity to get rid of the unwanted features is to enrich the model of elasto-plastic continuum by introducing higher strain gradients, or additional degrees of freedom of the Cosserat type (directors). Customary, the enriched structure of the advanced plasticity theories is related to the density of dislocations arising due to local plastic deformation inhomogeneities. In a detailed analysis of the macroscopic shear bands it is demonstrated that the above mentioned framework can be misleading. Surface observations reveal that a macroshear band on the sample scale is composed of a set of parallel regularly spaced microshear bands. The characteristic distance between micro bands is a base for introducing of physically meaningful higher gradients. The distance is controlled by hardening within the micro bands

Název v anglickém jazyce

On Strain Gradients in Plasticity

Popis výsledku anglicky

The classical theory of plasticity predicts no size effects and fails to describe localization of plastic strain in a realistic way. A standard way of extending plasticity to get rid of the unwanted features is to enrich the model of elasto-plastic continuum by introducing higher strain gradients, or additional degrees of freedom of the Cosserat type (directors). Customary, the enriched structure of the advanced plasticity theories is related to the density of dislocations arising due to local plastic deformation inhomogeneities. In a detailed analysis of the macroscopic shear bands it is demonstrated that the above mentioned framework can be misleading. Surface observations reveal that a macroshear band on the sample scale is composed of a set of parallel regularly spaced microshear bands. The characteristic distance between micro bands is a base for introducing of physically meaningful higher gradients. The distance is controlled by hardening within the micro bands

Druh

D - Stať ve sborníku

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

—

Projekt

—

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of 6th National Congress of Mechanics

ISBN

—

ISSN

—

e-ISSN

—

Počet stran výsledku

7

Strana od-do

14-20

Název nakladatele

Giahoudi-Giapouli

Místo vydání

Thessaloniki

Místo konání akce

Thessaloniki

Datum konání akce

19. 7. 2001

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—