A New Trend in Plasticity: Strain Gradient Theories

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

A New Trend in Plasticity: Strain Gradient Theories

Popis výsledku v původním jazyce

The recent renewed interest in the strain gradient plasticity has been motivated mainly by the experimental evidence that plastic flow processes in crystalline solids are inherently size dependent. However, similarly as in the previous attempts to introduce formally strain gradients into plasticity the current theories have failed to reflect the underlying physical mechanisms. Their range of validity has remained uncertain. The two major problems in the gradient theories are the choice of the gradientswhich are to be used and the formulation of adequate constitutive equations for them. This paper indicates that the problems can be overcome by putting the theoretical framework in correlation with microscopic observations. For the case of shear bands itis shown that an advanced non-local plasticity model need not be a curve fitting procedure providing that the constitutive equations for additional degrees of freedom (strain gradients, directors) are based on knowledge of the mechanism

Název v anglickém jazyce

A New Trend in Plasticity: Strain Gradient Theories

Popis výsledku anglicky

The recent renewed interest in the strain gradient plasticity has been motivated mainly by the experimental evidence that plastic flow processes in crystalline solids are inherently size dependent. However, similarly as in the previous attempts to introduce formally strain gradients into plasticity the current theories have failed to reflect the underlying physical mechanisms. Their range of validity has remained uncertain. The two major problems in the gradient theories are the choice of the gradientswhich are to be used and the formulation of adequate constitutive equations for them. This paper indicates that the problems can be overcome by putting the theoretical framework in correlation with microscopic observations. For the case of shear bands itis shown that an advanced non-local plasticity model need not be a curve fitting procedure providing that the constitutive equations for additional degrees of freedom (strain gradients, directors) are based on knowledge of the mechanism

Druh

D - Stať ve sborníku

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

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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 International Workshop Research Activities of Physical Departments of Civil Engineering Faculties in the Czech and Slovak Republics

ISBN

80-7204-201-7

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

29-34

Název nakladatele

Technical University

Místo vydání

Brno

Místo konání akce

Křižánky

Datum konání akce

26. 6. 2001

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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