Classically determined effective Delta K fails to quantify crack growth rates

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F20%3A00531947" target="_blank" >RIV/68081723:_____/20:00531947 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26620/20:PU137437

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0167844220301841?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167844220301841?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.tafmec.2020.102608" target="_blank" >10.1016/j.tafmec.2020.102608</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Classically determined effective Delta K fails to quantify crack growth rates

Popis výsledku v původním jazyce

Decomposition of the resistance to fatigue crack growth into the intrinsic and extrinsic component is very important for understanding of fatigue failure mechanisms, relation to microstructure and modelling of residual fatigue life. Crack closure for four grades of steel were estimated by the difference between K-max values and the effective Delta K-eff values (measured at the load ratio R = 0.8) corresponding to the same crack growth rate. The results showed that crack closure values obtained by the difference K-max - Delta K-eff were not in agreement with the available crack closure models, both the Newman's model of plasticity-induced closure and the results from finite element analysis. The discrepancies could not be explained by the effect of mean stress, specimen thickness, loading amplitude or T-stress. Therefore, the application of fracture mechanics to fatigue cracks should be revisited. It was pointed out that Delta K-eff may not be a good parameter for quantification of the crack driving force, since the relationship between K-max - K-cl and the cyclic plastic deformation at the crack tip might not be linear.

Název v anglickém jazyce

Classically determined effective Delta K fails to quantify crack growth rates

Popis výsledku anglicky

Decomposition of the resistance to fatigue crack growth into the intrinsic and extrinsic component is very important for understanding of fatigue failure mechanisms, relation to microstructure and modelling of residual fatigue life. Crack closure for four grades of steel were estimated by the difference between K-max values and the effective Delta K-eff values (measured at the load ratio R = 0.8) corresponding to the same crack growth rate. The results showed that crack closure values obtained by the difference K-max - Delta K-eff were not in agreement with the available crack closure models, both the Newman's model of plasticity-induced closure and the results from finite element analysis. The discrepancies could not be explained by the effect of mean stress, specimen thickness, loading amplitude or T-stress. Therefore, the application of fracture mechanics to fatigue cracks should be revisited. It was pointed out that Delta K-eff may not be a good parameter for quantification of the crack driving force, since the relationship between K-max - K-cl and the cyclic plastic deformation at the crack tip might not be linear.

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Theoretical and Applied Fracture Mechanics

ISSN

0167-8442

e-ISSN

—

Svazek periodika

108

Číslo periodika v rámci svazku

AUG

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

102608

Kód UT WoS článku

000552039000041

EID výsledku v databázi Scopus

2-s2.0-85083893647