Damage prediction with coupled fatigue and creep mechanism applied on generator turbine

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00010669%3A_____%2F16%3AN0000080" target="_blank" >RIV/00010669:_____/16:N0000080 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.kme.zcu.cz/compmech/index.php" target="_blank" >http://www.kme.zcu.cz/compmech/index.php</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Damage prediction with coupled fatigue and creep mechanism applied on generator turbine

Popis výsledku v původním jazyce

Presented work is dealt with thermo-mechanical fatigue analysis of the generator turbine. Only elastic stress and temperature field are taken from FEM analysis. Strain is calculated using nonlinear Maxwell model to cover both elasto-plasticity and visco-plasticity. For stepwise stress history elasto-plastic and visco-plastic strain component are gain independently solving one after another. Elasto-plastic and visco-plastic strain component are linked together with the principle of superposition. Visco-plastic component is taken into consideration only if actual temperature in current time step is higher than creep temperature. Current damage is calculated by Prandtl-Ishlinskii model of hysteresis using iso-thermal fatigue curves. For every point in loading history is consequently found closed hysteresis loop and damage increment corresponding to actual hysteresis loop is evaluated. Presented approach was applied to fatigue assessment of generator turbine loaded with simplified loading spectrum.

Název v anglickém jazyce

Damage prediction with coupled fatigue and creep mechanism applied on generator turbine

Popis výsledku anglicky

Presented work is dealt with thermo-mechanical fatigue analysis of the generator turbine. Only elastic stress and temperature field are taken from FEM analysis. Strain is calculated using nonlinear Maxwell model to cover both elasto-plasticity and visco-plasticity. For stepwise stress history elasto-plastic and visco-plastic strain component are gain independently solving one after another. Elasto-plastic and visco-plastic strain component are linked together with the principle of superposition. Visco-plastic component is taken into consideration only if actual temperature in current time step is higher than creep temperature. Current damage is calculated by Prandtl-Ishlinskii model of hysteresis using iso-thermal fatigue curves. For every point in loading history is consequently found closed hysteresis loop and damage increment corresponding to actual hysteresis loop is evaluated. Presented approach was applied to fatigue assessment of generator turbine loaded with simplified loading spectrum.

Druh

O - Ostatní výsledky

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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