New creep constitutive equation for finite element modelling including transient effects

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00488943" target="_blank" >RIV/68081723:_____/18:00488943 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388998:_____/18:00488943

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.mechmat.2018.01.008" target="_blank" >http://dx.doi.org/10.1016/j.mechmat.2018.01.008</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mechmat.2018.01.008" target="_blank" >10.1016/j.mechmat.2018.01.008</a>

Jazyk výsledku

angličtina

Název v původním jazyce

New creep constitutive equation for finite element modelling including transient effects

Popis výsledku v původním jazyce

Creep experiments are time consuming and expensive, moreover, it is not possible to carry out experiments under the actual service conditions of particular materials due to the very low creep strain rate. However, the process seems to be an ideal field for computer modelling. The experimental data are obviously only available for steady-state conditions, and so the effects of varying conditions during startup or shutdown of the components can be described by modelling. Modelling creep deformation is usually based on the so-called creep constitutive equations, which describe the strain rate dependence on stress, temperature and time, or creep strain. Unfortunately, the equations are derived from conventional creep experiments under constant load conditions, and so the transient effects upon stress changes are ignored. Because the stress is transformed between model elements, a correct description of the creep behaviour must contain the transient effects. In this work, the conventional approach to describing primary and secondary creep stages is combined with an internal stress model of the transient creep stage to address the problem of the stress changes, as well as that of the low-stress creep regime.

Název v anglickém jazyce

New creep constitutive equation for finite element modelling including transient effects

Popis výsledku anglicky

Creep experiments are time consuming and expensive, moreover, it is not possible to carry out experiments under the actual service conditions of particular materials due to the very low creep strain rate. However, the process seems to be an ideal field for computer modelling. The experimental data are obviously only available for steady-state conditions, and so the effects of varying conditions during startup or shutdown of the components can be described by modelling. Modelling creep deformation is usually based on the so-called creep constitutive equations, which describe the strain rate dependence on stress, temperature and time, or creep strain. Unfortunately, the equations are derived from conventional creep experiments under constant load conditions, and so the transient effects upon stress changes are ignored. Because the stress is transformed between model elements, a correct description of the creep behaviour must contain the transient effects. In this work, the conventional approach to describing primary and secondary creep stages is combined with an internal stress model of the transient creep stage to address the problem of the stress changes, as well as that of the low-stress creep regime.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Mechanics of Materials

ISSN

0167-6636

e-ISSN

—

Svazek periodika

119

Číslo periodika v rámci svazku

APR

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

49-55

Kód UT WoS článku

000428493500006

EID výsledku v databázi Scopus

2-s2.0-85041530758