Dislocation model for anelastic transient stage in metals under creep conditions

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

Dislocation model for anelastic transient stage in metals under creep conditions

Popis výsledku v původním jazyce

Transient strain was observed in metallic materials at the beginning of creep tests as well as upon any change of the applied stress. This strain is almost fully recoverable when the stress change is reversed. Thus it is based on anelasticity. During this transient stage, the strain rate decreases by three orders of magnitude or even more. Accurate description of the effect is crucial for calculations of potentially dangerous stress concentrations in parts high temperature equipments during changes of their working regime. Nevertheless, the model of the effect is still missing. This work presents physically based model of the reversible transient strain under creep conditions. The model is based on the dislocation links bowing and assume combined viscous glide and climb of dislocations. Results of the model are compared to the published creep curves of various metallic materials.

Název v anglickém jazyce

Dislocation model for anelastic transient stage in metals under creep conditions

Popis výsledku anglicky

Transient strain was observed in metallic materials at the beginning of creep tests as well as upon any change of the applied stress. This strain is almost fully recoverable when the stress change is reversed. Thus it is based on anelasticity. During this transient stage, the strain rate decreases by three orders of magnitude or even more. Accurate description of the effect is crucial for calculations of potentially dangerous stress concentrations in parts high temperature equipments during changes of their working regime. Nevertheless, the model of the effect is still missing. This work presents physically based model of the reversible transient strain under creep conditions. The model is based on the dislocation links bowing and assume combined viscous glide and climb of dislocations. Results of the model are compared to the published creep curves of various metallic materials.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/IAA200410701" target="_blank" >IAA200410701: Přechodové jevy při creepu za podmínek vedoucích k velmi malým rychlostem deformace.</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název statě ve sborníku

Creep and Fracture of Engineering Materials and Structure

ISBN

978-4-88903-407-3

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

"B28"

Název nakladatele

The Japan Institute of Metals

Místo vydání

Sendai

Místo konání akce

Kyoto

Datum konání akce

27. 5. 2012

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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