Detail publikace

Classically determined effective Delta K fails to quantify crack growth rates

VOJTEK, T. POKORNÝ, P. OPLT, T. JAMBOR, M. NÁHLÍK, L. HERRERO, D. HUTAŘ, P.

Originální název

Classically determined effective Delta K fails to quantify crack growth rates

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

Crack closure; effective Delta K; Constraint; Fatigue crack propagation; Finite element analysis; Steel

Autoři

VOJTEK, T.; POKORNÝ, P.; OPLT, T.; JAMBOR, M.; NÁHLÍK, L.; HERRERO, D.; HUTAŘ, P.

Vydáno

1. 8. 2020

Nakladatel

Elsevier

Místo

AMSTERDAM

ISSN

0167-8442

Periodikum

Theoretical and Applied Fracture Mechanics

Ročník

108

Číslo

1

Stát

Nizozemsko

Strany od

1

Strany do

13

Strany počet

13

URL

https://www.sciencedirect.com/science/article/pii/S0167844220301841

Plný text v Digitální knihovně

http://hdl.handle.net/11012/195859

BibTex

@article{BUT165546,
  author="Tomáš {Vojtek} and Pavel {Pokorný} and Tomáš {Oplt} and Michal {Jambor} and Luboš {Náhlík} and Diego {Herrero} and Pavel {Hutař}",
  title="Classically determined effective Delta K fails to quantify crack growth rates",
  journal="Theoretical and Applied Fracture Mechanics",
  year="2020",
  volume="108",
  number="1",
  pages="1--13",
  doi="10.1016/j.tafmec.2020.102608",
  issn="0167-8442",
  url="https://www.sciencedirect.com/science/article/pii/S0167844220301841"
}